eslint-plugin-jsdoc

JSDoc linting rules for ESLint.

• eslint-plugin-jsdoc
  • Installation
  • Configuration
  • Options
  • Settings
    • Allow tags (@private or @internal) to disable rules for that comment block
    • maxLines and minLines
    • Mode
    • Alias Preference
    • @override/@augments/@extends/@implements/@ignore Without Accompanying @param/@description/@example/@returns/@throws/@yields
    • Settings to Configure check-types and no-undefined-types
    • structuredTags
  • Advanced
    • AST and Selectors
  • Rules
    • check-access
    • check-alignment
    • check-examples
    • check-indentation
    • check-line-alignment
    • check-param-names
    • check-property-names
    • check-syntax
    • check-tag-names
    • check-types
    • check-values
    • empty-tags
    • implements-on-classes
    • match-description
    • match-name
    • multiline-blocks
    • newline-after-description
    • no-bad-blocks
    • no-defaults
    • no-missing-syntax
    • no-multi-asterisks
    • no-restricted-syntax
    • no-types
    • no-undefined-types
    • require-asterisk-prefix
    • require-description-complete-sentence
    • require-description
    • require-example
    • require-file-overview
    • require-hyphen-before-param-description
    • require-jsdoc
    • require-param-description
    • require-param-name
    • require-param-type
    • require-param
    • require-property
    • require-property-description
    • require-property-name
    • require-property-type
    • require-returns-check
    • require-returns-description
    • require-returns-type
    • require-returns
    • require-throws
    • require-yields
    • require-yields-check
    • tag-lines
    • valid-types

Installation

Install ESLint either locally or globally.

npm install --save-dev eslint

If you have installed ESLint globally, you have to install JSDoc plugin globally too. Otherwise, install it locally.

npm install --save-dev eslint-plugin-jsdoc

Configuration

Add plugins section to .eslintrc.* and specify eslint-plugin-jsdoc as a plugin.

{
    "plugins": [
        "jsdoc"
    ]
}

Finally, enable all of the rules that you would like to use.

{
    "rules": {
        "jsdoc/check-access": 1, // Recommended
        "jsdoc/check-alignment": 1, // Recommended
        "jsdoc/check-examples": 1,
        "jsdoc/check-indentation": 1,
        "jsdoc/check-line-alignment": 1,
        "jsdoc/check-param-names": 1, // Recommended
        "jsdoc/check-property-names": 1, // Recommended
        "jsdoc/check-syntax": 1,
        "jsdoc/check-tag-names": 1, // Recommended
        "jsdoc/check-types": 1, // Recommended
        "jsdoc/check-values": 1, // Recommended
        "jsdoc/empty-tags": 1, // Recommended
        "jsdoc/implements-on-classes": 1, // Recommended
        "jsdoc/match-description": 1,
        "jsdoc/multiline-blocks": 1, // Recommended
        "jsdoc/newline-after-description": 1, // Recommended
        "jsdoc/no-bad-blocks": 1,
        "jsdoc/no-defaults": 1,
        "jsdoc/no-missing-syntax": 1,
        "jsdoc/no-multi-asterisks": 1, // Recommended
        "jsdoc/no-restricted-syntax": 1,
        "jsdoc/no-types": 1,
        "jsdoc/no-undefined-types": 1, // Recommended
        "jsdoc/require-asterisk-prefix": 1,
        "jsdoc/require-description": 1,
        "jsdoc/require-description-complete-sentence": 1,
        "jsdoc/require-example": 1,
        "jsdoc/require-file-overview": 1,
        "jsdoc/require-hyphen-before-param-description": 1,
        "jsdoc/require-jsdoc": 1, // Recommended
        "jsdoc/require-param": 1, // Recommended
        "jsdoc/require-param-description": 1, // Recommended
        "jsdoc/require-param-name": 1, // Recommended
        "jsdoc/require-param-type": 1, // Recommended
        "jsdoc/require-property": 1, // Recommended
        "jsdoc/require-property-description": 1, // Recommended
        "jsdoc/require-property-name": 1, // Recommended
        "jsdoc/require-property-type": 1, // Recommended
        "jsdoc/require-returns": 1, // Recommended
        "jsdoc/require-returns-check": 1, // Recommended
        "jsdoc/require-returns-description": 1, // Recommended
        "jsdoc/require-returns-type": 1, // Recommended
        "jsdoc/require-throws": 1,
        "jsdoc/require-yields": 1, // Recommended
        "jsdoc/require-yields-check": 1, // Recommended
        "jsdoc/tag-lines": 1, // Recommended
        "jsdoc/valid-types": 1 // Recommended
    }
}

Or you can simply add the following to .eslintrc.*, which enables the rules commented above as "recommended":

{
  "extends": ["plugin:jsdoc/recommended"]
}

You can then selectively add to or override the recommended rules.

Options

Rules may, as per the ESLint user guide, have their own individual options. In eslint-plugin-jsdoc, a few options, such as, exemptedBy and contexts, may be used across different rules.

eslint-plugin-jsdoc options, if present, are generally in the form of an object supplied as the second argument in an array after the error level (any exceptions to this format are explained within that rule's docs).

// `.eslintrc.js`
{
  rules: {
    'jsdoc/require-example': [
        // The Error level should be `error`, `warn`, or `off` (or 2, 1, or 0)
        'error',
        // The options vary by rule, but are generally added to an options
        //  object as follows:
        {
          avoidExampleOnConstructors: true,
          exemptedBy: ['type']
        }
    ]
  }
}

Settings

Allow tags (@private or @internal) to disable rules for that comment block

• settings.jsdoc.ignorePrivate - Disables all rules for the comment block on which a @private tag (or @access private) occurs. Defaults to false. Note: This has no effect with the rule check-access (whose purpose is to check access modifiers) or empty-tags (which checks @private itself).
• settings.jsdoc.ignoreInternal - Disables all rules for the comment block on which a @internal tag occurs. Defaults to false. Note: This has no effect with the rule empty-tags (which checks @internal itself).

maxLines and minLines

One can use minLines and maxLines to indicate how many line breaks (if any) will be checked to find a jsdoc comment block before the given code block. These settings default to 0 and 1 respectively.

In conjunction with the require-jsdoc rule, these settings can be enforced so as to report problems if a jsdoc block is not found within the specified boundaries. The settings are also used in the fixer to determine how many line breaks to add when a block is missing.

Mode

• settings.jsdoc.mode - Set to typescript, closure, or jsdoc (the default unless the @typescript-eslint parser is in use in which case typescript will be the default). Note that if you do not wish to use separate .eslintrc.* files for a project containing both JavaScript and TypeScript, you can also use overrides. You may also set to "permissive" to try to be as accommodating to any of the styles, but this is not recommended. Currently is used for the following:
  • check-tag-names: Determine valid tags and aliases
  • no-undefined-types: Only check @template for types in "closure" and "typescript" modes
  • check-syntax: determines aspects that may be enforced
  • valid-types: in non-Closure mode, @extends, @package and access tags (e.g., @private) with a bracketed type are reported as are missing names with @typedef
  • For type/namepath-checking rules, determine which tags will be checked for types/namepaths (Closure allows types on some tags which the others do not, so these tags will additionally be checked in "closure" mode)
  • For type-checking rules, impacts parsing of types (through jsdoc-type-pratt-parser dependency)
  • Check preferred tag names
  • Disallows namepath on @interface for "closure" mode in valid-types (and avoids checking in other rules)

Alias Preference

Use settings.jsdoc.tagNamePreference to configure a preferred alias name for a JSDoc tag. The format of the configuration is: <primary tag name>: <preferred alias name>, e.g.

{
    "rules": {},
    "settings": {
        "jsdoc": {
            "tagNamePreference": {
                "param": "arg",
                "returns": "return"
            }
        }
    }
}

Note: ESLint does not allow settings to have keys which conflict with Object.prototype e.g. 'constructor'. To work around this, you can use the key 'tag constructor'.

One may also use an object with a message and replacement.

The following will report the message @extends is to be used over @augments as it is more evocative of classes than @augments upon encountering @augments.

{
    "rules": {},
    "settings": {
        "jsdoc": {
            "tagNamePreference": {
                "augments": {
                  "message": "@extends is to be used over @augments as it is more evocative of classes than @augments",
                  "replacement": "extends"
                }
            }
        }
    }
}

If one wishes to reject a normally valid tag, e.g., @todo, one may set the tag to false:

{
    "rules": {},
    "settings": {
        "jsdoc": {
            "tagNamePreference": {
                "todo": false
            }
        }
    }
}

A project wishing to ensure no blocks are left excluded from entering the documentation, might wish to prevent the @ignore tag in the above manner.

Or one may set the targeted tag to an object with a custom message, but without a replacement property:

{
    "rules": {},
    "settings": {
        "jsdoc": {
            "tagNamePreference": {
                "todo": {
                  "message": "We expect immediate perfection, so don't leave to-dos in your code."
                }
            }
        }
    }
}

Note that the preferred tags indicated in the settings.jsdoc.tagNamePreference map will be assumed to be defined by check-tag-names.

See check-tag-names for how that fact can be used to set an alias to itself to allow both the alias and the default (since aliases are otherwise not permitted unless used in tagNamePreference).

Default Preferred Aliases

The defaults in eslint-plugin-jsdoc (for tags which offer aliases) are as follows:

• @abstract (over @virtual)
• @augments (over @extends)
• @class (over @constructor)
• @constant (over @const)
• @default (over @defaultvalue)
• @description (over @desc)
• @external (over @host)
• @file (over @fileoverview, @overview)
• @fires (over @emits)
• @function (over @func, @method)
• @member (over @var)
• @param (over @arg, @argument)
• @property (over @prop)
• @returns (over @return)
• @throws (over @exception)
• @yields (over @yield)

This setting is utilized by the the rule for tag name checking (check-tag-names) as well as in the @param and @require rules:

• check-param-names
• check-tag-names
• require-hyphen-before-param-description
• require-description
• require-param
• require-param-description
• require-param-name
• require-param-type
• require-returns
• require-returns-check
• require-returns-description
• require-returns-type

@override/@augments/@extends/@implements/@ignore Without Accompanying @param/@description/@example/@returns/@throws/@yields

The following settings allows the element(s) they reference to be omitted on the JSDoc comment block of the function or that of its parent class for any of the "require" rules (i.e., require-param, require-description, require-example, require-returns, require-throws, require-yields).

• settings.jsdoc.ignoreReplacesDocs (@ignore) - Defaults to true
• settings.jsdoc.overrideReplacesDocs (@override) - Defaults to true
• settings.jsdoc.augmentsExtendsReplacesDocs (@augments or its alias @extends) - Defaults to false.
• settings.jsdoc.implementsReplacesDocs (@implements) - Defaults to false

The format of the configuration is as follows:

{
    "rules": {},
    "settings": {
        "jsdoc": {
            "ignoreReplacesDocs": true,
            "overrideReplacesDocs": true,
            "augmentsExtendsReplacesDocs": true,
            "implementsReplacesDocs": true
        }
    }
}

Settings to Configure check-types and no-undefined-types

• settings.jsdoc.preferredTypes An option map to indicate preferred or forbidden types (if default types are indicated here, these will have precedence over the default recommendations for check-types). The keys of this map are the types to be replaced (or forbidden). These keys may include:

  1. The "ANY" type, *
  2. The pseudo-type [] which we use to denote the parent (array) types used in the syntax string[], number[], etc.
  3. The pseudo-type .<> (or .) to represent the format Array.<value> or Object.<key, value>
  4. The pseudo-type <> to represent the format Array<value> or Object<key, value>
  5. A plain string type, e.g., MyType
  6. A plain string type followed by one of the above pseudo-types (except for [] which is always assumed to be an Array), e.g., Array., or SpecialObject<>.

  If a bare pseudo-type is used, it will match all parent types of that form. If a pseudo-type prefixed with a type name is used, it will only match parent types of that form and type name.

  The values can be:

  • false to forbid the type
  • a string to indicate the type that should be preferred in its place (and which fix mode can replace); this can be one of the formats of the keys described above.
    • Note that the format will not be changed unless you use a pseudo-type in the replacement. (For example, 'Array.<>': 'MyArray' will change Array.<string> to MyArray.<string>, preserving the dot. To get rid of the dot, you must use the pseudo-type with <>, i.e., 'Array.<>': 'MyArray<>', which will change Array.<string> to MyArray<string>).
    • If you use a bare pseudo-type in the replacement (e.g., 'MyArray.<>': '<>'), the type will be converted to the format of the pseudo-type without changing the type name. For example, MyArray.<string> will become MyArray<string> but Array.<string> will not be modified.
  • an object with:
    • the key message to provide a specific error message when encountering the discouraged type.
      • The message string will have the substrings with special meaning, {{tagName}} and {{tagValue}}, replaced with their corresponding value.
    • an optional key replacement with either of the following values:
      • a string type to be preferred in its place (and which fix mode can replace)
      • false (for forbidding the type)

Note that the preferred types indicated as targets in settings.jsdoc.preferredTypes map will be assumed to be defined by no-undefined-types.

See the option of check-types, unifyParentAndChildTypeChecks, for how the keys of preferredTypes may have <> or .<> (or just .) appended and its bearing on whether types are checked as parents/children only (e.g., to match Array if the type is Array vs. Array.<string>).

Note that if a value is present both as a key and as a value, neither the key nor the value will be reported. Thus in check-types, this fact can be used to allow both object and Object if one has a preferredTypes key object: 'Object' and Object: 'object'.

structuredTags

An object indicating tags whose types and names/namepaths (whether defining or referencing namepaths) will be checked, subject to configuration. If the tags have predefined behavior or allowEmptyNamepaths behavior, this option will override that behavior for any specified tags, though this option can also be used for tags without predefined behavior. Its keys are tag names and its values are objects with the following optional properties:

• name - String set to one of the following:
  • "text" - When a name is present, plain text will be allowed in the name position (non-whitespace immediately after the tag and whitespace), e.g., in @throws This is an error, "This" would normally be the name, but "text" allows non-name text here also. This is the default.
  • "namepath-defining" - As with namepath-referencing, but also indicates the tag adds a namepath to definitions, e.g., to prevent no-undefined-types from reporting references to that namepath.
  • "namepath-referencing" - This will cause any name position to be checked to ensure it is a valid namepath. You might use this to ensure that tags which normally allow free text, e.g., @see will instead require a namepath.
  • false - This will disallow any text in the name position.
• type:
  • true - Allows valid types within brackets. This is the default.
  • false - Explicitly disallows any brackets or bracketed type. You might use this with @throws to suggest that only free form text is being input or with @augments (for jsdoc mode) to disallow Closure-style bracketed usage along with a required namepath.
  • (An array of strings) - A list of permissible types.
• required - Array of one of the following (defaults to an empty array, meaning none are required):
  • One or both of the following strings (if both are included, then both are required):
    • "name" - Indicates that a name position is required (not just that if present, it is a valid namepath). You might use this with see to insist that a value (or namepath, depending on the name value) is always present.
    • "type" - Indicates that the type position (within curly brackets) is required (not just that if present, it is a valid type). You might use this with @throws or @typedef which might otherwise normally have their types optional. See the type groups 3-5 above.
  • "typeOrName" - Must have either type (e.g., @throws {aType}) or name (@throws Some text); does not require that both exist but disallows just an empty tag.

Advanced

AST and Selectors

For various rules, one can add to the environments to which the rule applies by using the contexts option.

This option works with ESLint's selectors which are esquery expressions one may use to target a specific node type or types, including subsets of the type(s) such as nodes with certain children or attributes.

These expressions are used within ESLint plugins to find those parts of your files' code which are of interest to check. However, in eslint-plugin-jsdoc, we also allow you to use these selectors to define additional contexts where you wish our own rules to be applied.

contexts format

While at their simplest, these can be an array of string selectors, one can also supply an object with context (in place of the string) and one of two properties:

1. For require-jsdoc, there is also a inlineCommentBlock property. See that rule for details.
2. For no-missing-syntax and no-restricted-syntax, there is also a message property which allows customization of the message to be shown when the rule is triggered.
3. For no-missing-syntax, there is also a minimum property. See that rule.
4. For other rules, there is a comment property which adds to the context in requiring that the comment AST condition is also met, e.g., to require that certain tags are present and/or or types and type operators are in use. Note that this AST (either for Jsdoc* or JsdocType* AST) has not been standardized and should be considered experimental. Note that this property might also become obsolete if parsers begin to include JSDoc-structured AST. A parser is available which aims to support comment AST as a first class citizen where comment/comment types can be used anywhere within a normal AST selector but this should only be considered experimental. When using such a parser, you need not use comment and can just use a plain string context. The determination of the node on which the comment is attached is also subject to change. It may be currently possible for different structures to map to the same comment block. This is because normally when querying to find either the declaration of the function expression for const quux = function () {}, the associated comment would, in both cases, generally be expected to be on the line above both, rather than to be immediately preceding the function (in the case of the function). See @es-joy/jsdoccomment for the precise structure of the comment (and comment type) nodes.

Discovering available AST definitions

To know all of the AST definitions one may target, it will depend on the parser you are using with ESLint (e.g., espree is the default parser for ESLint, and this follows EStree AST but to support the the latest experimental features of JavaScript, one may use @babel/eslint-parser or to be able to have one's rules (including JSDoc rules) apply to TypeScript, one may use @typescript-eslint/parser, etc.

So you can look up a particular parser to see its rules, e.g., browse through the ESTree docs as used by Espree or see ESLint's overview of the structure of AST.

However, it can sometimes be even more helpful to get an idea of AST by just providing some of your JavaScript to the wonderful AST Explorer tool and see what AST is built out of your code. You can set the tool to the specific parser which you are using.

Uses/Tips for AST

And if you wish to introspect on the AST of code within your projects, you can use eslint-plugin-query. Though it also works as a plugin, you can use it with its own CLI, e.g., to search your files for matching esquery selectors, optionally showing it as AST JSON.

Tip: If you want to more deeply understand not just the resulting AST tree structures for any given code but also the syntax for esquery selectors so that you can, for example, find only those nodes with a child of a certain type, you can set the "Transform" feature to ESLint and test out esquery selectors in place of the selector expression (e.g., replace 'VariableDeclaration > VariableDeclarator > Identifier[name="someVar"]' as we have here) to the selector you wish so as to get messages reported in the bottom right pane which match your esquery selector).

Rules

check-access

Checks that @access tags use one of the following values:

• "package", "private", "protected", "public"

Also reports:

• Mixing of @access with @public, @private, @protected, or @package on the same doc block.
• Use of multiple instances of @access (or the @public, etc. style tags) on the same doc block.

Context	everywhere
Tags	@access
Recommended	false
Settings
Options

The following patterns are considered problems:

/**
 * @access foo
 */
function quux (foo) {

}
// Message: Missing valid JSDoc @access level.

/**
 * @access foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"ignorePrivate":true}}
// Message: Missing valid JSDoc @access level.

/**
 * @accessLevel foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"access":"accessLevel"}}}
// Message: Missing valid JSDoc @accessLevel level.

/**
 * @access
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"access":false}}}
// Message: Unexpected tag `@access`

class MyClass {
  /**
   * @access
   */
  myClassField = 1
}
// Message: Missing valid JSDoc @access level.

/**
 * @access public
 * @public
 */
function quux (foo) {

}
// Message: The @access tag may not be used with specific access-control tags (@package, @private, @protected, or @public).

/**
 * @access public
 * @access private
 */
function quux (foo) {

}
// Message: At most one access-control tag may be present on a jsdoc block.

/**
 * @access public
 * @access private
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"ignorePrivate":true}}
// Message: At most one access-control tag may be present on a jsdoc block.

/**
 * @public
 * @private
 */
function quux (foo) {

}
// Message: At most one access-control tag may be present on a jsdoc block.

/**
 * @public
 * @private
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"ignorePrivate":true}}
// Message: At most one access-control tag may be present on a jsdoc block.

/**
 * @public
 * @public
 */
function quux (foo) {

}
// Message: At most one access-control tag may be present on a jsdoc block.

The following patterns are not considered problems:

/**
 *
 */
function quux (foo) {

}

/**
 * @access public
 */
function quux (foo) {

}

/**
 * @accessLevel package
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"access":"accessLevel"}}}

class MyClass {
  /**
   * @access private
   */
  myClassField = 1
}

/**
 * @public
 */
function quux (foo) {

}

/**
 * @private
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"ignorePrivate":true}}

check-alignment

Reports invalid alignment of JSDoc block asterisks.

Context	everywhere
Tags	N/A
Recommended	true

The following patterns are considered problems:

/**
  * @param {Number} foo
 */
function quux (foo) {
  // with spaces
}
// Message: Expected JSDoc block to be aligned.

/**
  * @param {Number} foo
 */
function quux (foo) {
	// with tabs
}
// Message: Expected JSDoc block to be aligned.

/**
  * @param {Number} foo
 */
function quux (foo) {
  // with spaces
}
// Message: Expected JSDoc block to be aligned.

/**
* @param {Number} foo
*/
function quux (foo) {
  // with spaces
}
// Message: Expected JSDoc block to be aligned.

/**
 * @param {Number} foo
  */
function quux (foo) {

}
// Message: Expected JSDoc block to be aligned.

 /**
 * @param {Number} foo
 */
function quux (foo) {

}
// Message: Expected JSDoc block to be aligned.

 /**
  * @param {Number} foo
 */
function quux (foo) {

}
// Message: Expected JSDoc block to be aligned.

/**
  * @param {Number} foo
  */
 function quux (foo) {

 }
// Message: Expected JSDoc block to be aligned.

/**
   * A jsdoc not attached to any node.
 */
// Message: Expected JSDoc block to be aligned.

class Foo {
  /**
   *  Some method
    * @param a
   */
  quux(a) {}
}
// Message: Expected JSDoc block to be aligned.

The following patterns are not considered problems:

/**
 * Desc
 *
 * @param {Number} foo
 */
function quux (foo) {

}

/**
 * Desc
 *
 * @param {{
  foo: Bar,
  bar: Baz
 * }} foo
 *
 */
function quux (foo) {

}

/*  <- JSDoc must start with 2 stars.
  *    So this is unchecked.
 */
function quux (foo) {}

/**
  * @param {Number} foo
  * @private
 */
function quux (foo) {
  // with spaces
}
// Settings: {"jsdoc":{"ignorePrivate":true}}

/**
  * @param {Number} foo
  * @access private
 */
function quux (foo) {
  // with spaces
}
// Settings: {"jsdoc":{"ignorePrivate":true}}

check-examples

NOTE: This rule currently does not work in ESLint 8 (we are waiting for issue 14745).

Ensures that (JavaScript) examples within JSDoc adhere to ESLint rules. Also has options to lint the default values of optional @param/@arg/@argument and @property/@prop tags or the values of @default/@defaultvalue tags.

Options

The options below all default to no-op/false except as noted.

captionRequired

JSDoc specs use of an optional <caption> element at the beginning of @example.

The option captionRequired insists on a <caption> being present at the beginning of any @example.

Used only for @example.

exampleCodeRegex and rejectExampleCodeRegex

JSDoc does not specify a formal means for delimiting code blocks within @example (it uses generic syntax highlighting techniques for its own syntax highlighting). The following options determine whether a given @example tag will have the check-examples checks applied to it:

• exampleCodeRegex - Regex which whitelists lintable examples. If a parenthetical group is used, the first one will be used, so you may wish to use (?:...) groups where you do not wish the first such group treated as one to include. If no parenthetical group exists or matches, the whole matching expression will be used. An example might be "^```(?:js|javascript)([\\s\\S]*)```\s*$" to only match explicitly fenced JavaScript blocks. Defaults to only using the u flag, so to add your own flags, encapsulate your expression as a string, but like a literal, e.g., /```js.*```/gi. Note that specifying a global regular expression (i.e., with g) will allow independent linting of matched blocks within a single @example.
• rejectExampleCodeRegex - Regex blacklist which rejects non-lintable examples (has priority over exampleCodeRegex). An example might be "^`" to avoid linting fenced blocks which may indicate a non-JavaScript language. See exampleCodeRegex on how to add flags if the default u is not sufficient.

If neither is in use, all examples will be matched. Note also that even if captionRequired is not set, any initial <caption> will be stripped out before doing the regex matching.

paddedIndent

This integer property allows one to add a fixed amount of whitespace at the beginning of the second or later lines of the example to be stripped so as to avoid linting issues with the decorative whitespace. For example, if set to a value of 4, the initial whitespace below will not trigger indent rule errors as the extra 4 spaces on each subsequent line will be stripped out before evaluation.

/**
 * @example
 *     anArray.filter((a) => {
 *       return a.b;
 *     });
 */

Only applied to @example linting.

reportUnusedDisableDirectives

If not set to false, reportUnusedDisableDirectives will report disabled directives which are not used (and thus not needed). Defaults to true. Corresponds to ESLint's --report-unused-disable-directives.

Inline ESLint config within @example JavaScript is allowed (or within @default, etc.), though the disabling of ESLint directives which are not needed by the resolved rules will be reported as with the ESLint --report-unused-disable-directives command.

Options for Determining ESLint Rule Applicability (allowInlineConfig, noDefaultExampleRules, matchingFileName, configFile, checkEslintrc, and baseConfig)

The following options determine which individual ESLint rules will be applied to the JavaScript found within the @example tags (as determined to be applicable by the above regex options) or for the other tags checked by checkDefaults, checkParams, or checkProperties options. They are ordered by decreasing precedence:

• allowInlineConfig - If not set to false, will allow inline config within the @example to override other config. Defaults to true.
• noDefaultExampleRules - Setting to true will disable the default rules which are expected to be troublesome for most documentation use. See the section below for the specific default rules.
• configFile - A config file. Corresponds to ESLint's -c.
• matchingFileName - Option for a file name (even non-existent) to trigger specific rules defined in one's config; usable with ESLint .eslintrc.* overrides -> files globs, to apply a desired subset of rules with @example (besides allowing for rules specific to examples, this option can be useful for enabling reuse of the same rules within @example as with JavaScript Markdown lintable by other plugins, e.g., if one sets matchingFileName to dummy.md/*.js so that @example rules will follow rules for fenced JavaScript blocks within one's Markdown rules). (In ESLint 6's processor API and eslint-plugin-markdown < 2, one would instead use dummy.md.) For @example only.
• matchingFileNameDefaults - As with matchingFileName but for use with checkDefaults and defaulting to .jsdoc-defaults as extension.
• matchingFileNameParams - As with matchingFileName but for use with checkParams and defaulting to .jsdoc-params as extension.
• matchingFileNameProperties As with matchingFileName but for use with checkProperties and defaulting to .jsdoc-properties as extension.
• checkEslintrc - Defaults to true in adding rules based on an .eslintrc.* file. Setting to false corresponds to ESLint's --no-eslintrc. If matchingFileName is set, this will automatically be true and will use the config corresponding to that file. If matchingFileName is not set and this value is set to false, the .eslintrc.* configs will not be checked. If matchingFileName is not set, and this is unset or set to true, the .eslintrc.* configs will be checked as though the file name were the same as the file containing the example, with any file extension changed to ".md/*.js" (and if there is no file extension, "dummy.md/*.js" will be the result). This allows convenient sharing of similar rules with often also context-free Markdown as well as use of overrides as described under matchingFileName. Note that this option (whether set by matchingFileName or set manually to true) may come at somewhat of a performance penalty as the file's existence is checked by eslint.
• baseConfig - Set to an object of rules with the same schema as .eslintrc.* for defaults.

Rules Disabled by Default Unless noDefaultExampleRules is Set to true

• eol-last - Insisting that a newline "always" be at the end is less likely to be desired in sample code as with the code file convention.
• no-console - This rule is unlikely to have inadvertent temporary debugging within examples.
• no-multiple-empty-lines - This rule may be problematic for projects which use an initial newline just to start an example. Also, projects may wish to use extra lines within examples just for easier illustration purposes.
• no-undef - Many variables in examples will be undefined.
• no-unused-vars - It is common to define variables for clarity without always using them within examples.
• padded-blocks - It can generally look nicer to pad a little even if one's code follows more stringency as far as block padding.
• jsdoc/require-file-overview - Shouldn't check example for jsdoc blocks.
• jsdoc/require-jsdoc - Wouldn't expect jsdoc blocks within jsdoc blocks.
• import/no-unresolved - One wouldn't generally expect example paths to resolve relative to the current JavaScript file as one would with real code.
• import/unambiguous - Snippets in examples are likely too short to always include full import/export info.
• node/no-missing-import - See import/no-unresolved.
• node/no-missing-require - See import/no-unresolved.

For checkDefaults, checkParams, and checkProperties, the following expression-oriented rules will be used by default as well:

• quotes - Will insist on "double".
• semi - Will insist on "never".
• strict - Disabled.
• no-empty-function - Disabled.
• no-new - Disabled.
• no-unused-expressions - Disabled.
• chai-friendly/no-unused-expressions - Disabled.

Options for checking other than @example (checkDefaults, checkParams, or checkProperties)

• checkDefaults - Whether to check the values of @default/@defaultvalue tags
• checkParams - Whether to check @param/@arg/@argument default values
• checkProperties - Whether to check @property/@prop default values

Context	everywhere
Tags	example
Recommended	false
Options	See above

The following patterns are considered problems:

/**
 * @example alert('hello')
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"no-alert":2,"semi":["error","always"]}},"checkEslintrc":false}]
// Message: @example error (no-alert): Unexpected alert.

/**
 * @example alert('hello')
 */
class quux {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"no-alert":2,"semi":["error","always"]}},"checkEslintrc":false}]
// Message: @example error (no-alert): Unexpected alert.

/**
 * @example ```js
 alert('hello');
 ```
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"semi":["error","never"]}},"checkEslintrc":false,"exampleCodeRegex":"```js([\\s\\S]*)```"}]
// Message: @example error (semi): Extra semicolon.

/**
 * @example
 *
 * ```js alert('hello'); ```
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"semi":["error","never"]}},"checkEslintrc":false,"exampleCodeRegex":"```js ([\\s\\S]*)```"}]
// Message: @example error (semi): Extra semicolon.

/**
 * @example
 * ```js alert('hello'); ```
 */
var quux = {

};
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"semi":["error","never"]}},"checkEslintrc":false,"exampleCodeRegex":"```js ([\\s\\S]*)```"}]
// Message: @example error (semi): Extra semicolon.

/**
 * @example ```
 * js alert('hello'); ```
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"semi":["error","never"]}},"checkEslintrc":false,"exampleCodeRegex":"```\njs ([\\s\\S]*)```"}]
// Message: @example error (semi): Extra semicolon.

/**
 * @example <b>Not JavaScript</b>
 */
function quux () {

}
/**
 * @example quux2();
 */
function quux2 () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"semi":["error","never"]}},"checkEslintrc":false,"rejectExampleCodeRegex":"^\\s*<.*>\\s*$"}]
// Message: @example error (semi): Extra semicolon.

/**
 * @example
 * quux(); // does something useful
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"no-undef":["error"]}},"checkEslintrc":false,"noDefaultExampleRules":true}]
// Message: @example error (no-undef): 'quux' is not defined.

/**
 * @example <caption>Valid usage</caption>
 * quux(); // does something useful
 *
 * @example
 * quux('random unwanted arg'); // results in an error
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"captionRequired":true,"checkEslintrc":false}]
// Message: Caption is expected for examples.

/**
 * @example  quux();
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"indent":["error"]}},"checkEslintrc":false,"noDefaultExampleRules":false}]
// Message: @example error (indent): Expected indentation of 0 spaces but found 1.

/**
 * @example test() // eslint-disable-line semi
 */
function quux () {}
// "jsdoc/check-examples": ["error"|"warn", {"checkEslintrc":false,"noDefaultExampleRules":true,"reportUnusedDisableDirectives":true}]
// Message: @example error: Unused eslint-disable directive (no problems were reported from 'semi').

/**
 * @example
 test() // eslint-disable-line semi
 */
function quux () {}
// "jsdoc/check-examples": ["error"|"warn", {"allowInlineConfig":false,"baseConfig":{"rules":{"semi":["error","always"]}},"checkEslintrc":false,"noDefaultExampleRules":true}]
// Message: @example error (semi): Missing semicolon.

/**
 * @example const i = 5;
 * quux2()
 */
function quux2 () {

}
// "jsdoc/check-examples": ["error"|"warn", {"matchingFileName":"../../jsdocUtils.js"}]
// Message: @example warning (id-length): Identifier name 'i' is too short (< 2).

/**
 * @example const i = 5;
 * quux2()
 */
function quux2 () {

}
// "jsdoc/check-examples": ["error"|"warn", {"configFile":".eslintrc.json","matchingFileName":"../../jsdocUtils.js"}]
// Message: @example warning (id-length): Identifier name 'i' is too short (< 2).

/**
 * @example const i = 5;
 * quux2()
 */
function quux2 () {

}
// Message: @example warning (id-length): Identifier name 'i' is too short (< 2).

/**
 * @example const i = 5;
 *   quux2()
 */
function quux2 () {

}
// "jsdoc/check-examples": ["error"|"warn", {"paddedIndent":2}]
// Message: @example warning (id-length): Identifier name 'i' is too short (< 2).

/**
 * @example
 * const i = 5;
 * quux2()
 */
function quux2 () {

}
// Message: @example warning (id-length): Identifier name 'i' is too short (< 2).

/**
 * @example const idx = 5;
 * quux2()
 */
function quux2 () {

}
// "jsdoc/check-examples": ["error"|"warn", {"matchingFileName":"dummy.js"}]
// Message: @example error (semi): Missing semicolon.

/**
 * @example const idx = 5;
 *
 * quux2()
 */
function quux2 () {

}
// "jsdoc/check-examples": ["error"|"warn", {"matchingFileName":"dummy.js"}]
// Message: @example error (semi): Missing semicolon.

/**
 * @example const idx = 5;
 *
 * quux2()
 */
function quux2 () {

}
// "jsdoc/check-examples": ["error"|"warn", {"checkEslintrc":false,"matchingFileName":"dummy.js"}]
// Message: @example error: Parsing error: The keyword 'const' is reserved

/**
 * @example // begin
 alert('hello')
 // end
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"semi":["warn","always"]}},"checkEslintrc":false,"exampleCodeRegex":"// begin[\\s\\S]*// end","noDefaultExampleRules":true}]
// Message: @example warning (semi): Missing semicolon.

/**
 * @typedef {string} Foo
 * @example <caption></caption>
 * 'foo'
 */
// "jsdoc/check-examples": ["error"|"warn", {"captionRequired":true,"checkEslintrc":false}]
// Message: Caption is expected for examples.

/**
 * @example
 * const list: number[] = [1, 2, 3]
 * quux(list);
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"parser":"@typescript-eslint/parser","parserOptions":{"ecmaVersion":6},"rules":{"semi":["error","always"]}},"checkEslintrc":false}]
// Message: @example error (semi): Missing semicolon.

/**
 * @example
 * const test = something.find((_) => {
 *   return _
 * });
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"parserOptions":{"ecmaVersion":6},"rules":{"semi":["error","always"]}}}]
// Message: @example error (semi): Missing semicolon.

/**
 * @example <caption>Say `Hello!` to the user.</caption>
 * First, import the function:
 *
 * ```js
 * import popup from './popup'
 * const aConstInSameScope = 5;
 * ```
 *
 * Then use it like this:
 *
 * ```js
 * const aConstInSameScope = 7;
 * popup('Hello!')
 * ```
 *
 * Here is the result on macOS:
 *
 * ![Screenshot](path/to/screenshot.jpg)
 */
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"parserOptions":{"ecmaVersion":2015,"sourceType":"module"},"rules":{"semi":["error","always"]}},"checkEslintrc":false,"exampleCodeRegex":"/^```(?:js|javascript)\\n([\\s\\S]*?)```$/gm"}]
// Message: @example error (semi): Missing semicolon.

/**
 * @example // begin
 alert('hello')
 // end
 * And here is another example:
 // begin
 alert('there')
 // end
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"semi":["warn","always"]}},"checkEslintrc":false,"exampleCodeRegex":"/\\/\\/ begin[\\s\\S]*?// end/g","noDefaultExampleRules":true}]
// Message: @example warning (semi): Missing semicolon.

/**
 * @example
 *   quux();
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"indent":["error"]}},"checkEslintrc":false,"noDefaultExampleRules":false}]
// Message: @example error (indent): Expected indentation of 0 spaces but found 2.

/**
 * @default 'abc'
 */
const str = 'abc';
// "jsdoc/check-examples": ["error"|"warn", {"checkDefaults":true}]
// Message: @default error (quotes): Strings must use doublequote.

/**
 * @param {myType} [name='abc']
 */
function quux () {
}
// "jsdoc/check-examples": ["error"|"warn", {"checkParams":true}]
// Message: @param error (quotes): Strings must use doublequote.

/**
 * @property {myType} [name='abc']
 */
const obj = {};
// "jsdoc/check-examples": ["error"|"warn", {"checkProperties":true}]
// Message: @property error (quotes): Strings must use doublequote.

/**
 * Test function.
 *
 * @example <caption>functionName (paramOne: string, paramTwo?: any,
 * paramThree?: any): boolean</caption> test()
 *
 * @param {string} paramOne Parameter description.
 * @param {any} [paramTwo] Parameter description.
 * @param {any} [paramThree] Parameter description.
 * @returns {boolean} Return description.
 */
const functionName = function (paramOne, paramTwo,
  paramThree) {
  return false;
};
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"parserOptions":{"ecmaVersion":2015,"sourceType":"module"},"rules":{"semi":["error","always"]}},"captionRequired":true,"checkEslintrc":false}]
// Message: @example error (semi): Missing semicolon.

The following patterns are not considered problems:

/**
 * @example ```js
 alert('hello');
 ```
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"semi":["error","always"]}},"checkEslintrc":false,"exampleCodeRegex":"```js([\\s\\S]*)```"}]

/**
 * @example ```js
 alert('hello');
 ```
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"semi":["error","always"]}},"checkEslintrc":false,"exampleCodeRegex":"/```js([\\s\\S]*)```/"}]

/**
 * @example
 * // arbitrary example content
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"checkEslintrc":false}]

/**
 * @example
 * quux(); // does something useful
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"no-undef":["error"]}},"checkEslintrc":false,"noDefaultExampleRules":false}]

/**
 * @example quux();
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"indent":["error"]}},"checkEslintrc":false,"noDefaultExampleRules":false}]

/**
 * @example <caption>Valid usage</caption>
 * quux(); // does something useful
 *
 * @example <caption>Invalid usage</caption>
 * quux('random unwanted arg'); // results in an error
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"captionRequired":true,"checkEslintrc":false}]

/**
 * @example test() // eslint-disable-line semi
 */
function quux () {}
// "jsdoc/check-examples": ["error"|"warn", {"checkEslintrc":false,"noDefaultExampleRules":true,"reportUnusedDisableDirectives":false}]

/**
 * @example
 test() // eslint-disable-line semi
 */
function quux () {}
// "jsdoc/check-examples": ["error"|"warn", {"allowInlineConfig":true,"baseConfig":{"rules":{"semi":["error","always"]}},"checkEslintrc":false,"noDefaultExampleRules":true}]

/**
 * @example ```js
 alert('hello')
 ```
 */
var quux = {

};
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"semi":["error","never"]}},"checkEslintrc":false,"exampleCodeRegex":"```js([\\s\\S]*)```"}]

/**
 * @example
 * foo(function (err) {
 *     throw err;
 * });
 */
function quux () {}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"indent":["error"]}},"checkEslintrc":false,"noDefaultExampleRules":false}]

/**
 * @example
 * const list: number[] = [1, 2, 3];
 * quux(list);
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"parser":"@typescript-eslint/parser","parserOptions":{"ecmaVersion":6},"rules":{"semi":["error","always"]}},"checkEslintrc":false}]

/**
 * @example const ident = 5;
 *   quux2();
 *   bar();
 */
function quux2 () {

}
// "jsdoc/check-examples": ["error"|"warn", {"paddedIndent":2}]

/**
 * @example
 * function quux() {
 *     bar();
 * }
 */
function quux () {

}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"rules":{"indent":["error"]}},"checkEslintrc":false,"noDefaultExampleRules":false}]

// Comment
a();

export default {};

/**
 *
 */
function f () {

}

/**
 * Does quux
 * @example
 * // Do it!
 * quux();
 */
function quux () {
}
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"plugins":["jsdoc"],"rules":{"jsdoc/require-file-overview":["error"]}},"checkEslintrc":false,"noDefaultExampleRules":false}]

/**
 * @default "abc"
 */
const str = 'abc';
// "jsdoc/check-examples": ["error"|"warn", {"checkDefaults":true}]

/**
 * @default
 */
const str = 'abc';
// "jsdoc/check-examples": ["error"|"warn", {"checkDefaults":true}]

/**
 * @param {myType} [name="abc"]
 */
function quux () {
}
// "jsdoc/check-examples": ["error"|"warn", {"checkParams":true}]

/**
 * @param {myType} name
 */
function quux () {
}
// "jsdoc/check-examples": ["error"|"warn", {"checkParams":true}]

/**
 * @property {myType} [name="abc"]
 */
const obj = {};
// "jsdoc/check-examples": ["error"|"warn", {"checkProperties":true}]

/**
 * @property {myType} [name]
 */
const obj = {};
// "jsdoc/check-examples": ["error"|"warn", {"checkProperties":true}]

/**
 * @default 'abc'
 */
const str = 'abc';
// "jsdoc/check-examples": ["error"|"warn", {"checkDefaults":false,"matchingFileNameDefaults":"dummy.js"}]

/**
 * @param {myType} [name='abc']
 */
function quux () {
}
// "jsdoc/check-examples": ["error"|"warn", {"checkParams":false,"matchingFileNameParams":"dummy.js"}]

/**
 * @property {myType} [name='abc']
 */
const obj = {};
// "jsdoc/check-examples": ["error"|"warn", {"checkProperties":false,"matchingFileNameProperties":"dummy.js"}]

/**
 * Test function.
 *
 * @example <caption>functionName (paramOne: string, paramTwo?: any,
 * paramThree?: any): boolean</caption> test();
 *
 * @param {string} paramOne Parameter description.
 * @param {any} [paramTwo] Parameter description.
 * @param {any} [paramThree] Parameter description.
 * @returns {boolean} Return description.
 */
const functionName = function (paramOne, paramTwo,
  paramThree) {
  return false;
};
// "jsdoc/check-examples": ["error"|"warn", {"baseConfig":{"parserOptions":{"ecmaVersion":2015,"sourceType":"module"},"rules":{"semi":["error","always"]}},"captionRequired":true,"checkEslintrc":false}]

check-indentation

Reports invalid padding inside JSDoc blocks.

Ignores parts enclosed in Markdown "code block"'s. For example, the following description is not reported:

/**
 * Some description:
 * ```html
 * <section>
 *   <title>test</title>
 * </section>
 * ```
 */

Options

This rule has an object option.

excludeTags

Array of tags (e.g., ['example', 'description']) whose content will be "hidden" from the check-indentation rule. Defaults to ['example'].

By default, the whole JSDoc block will be checked for invalid padding. That would include @example blocks too, which can get in the way of adding full, readable examples of code without ending up with multiple linting issues.

When disabled (by passing excludeTags: [] option), the following code will report a padding issue:

/**
 * @example
 * anArray.filter((a) => {
 *   return a.b;
 * });
 */

Context	everywhere
Tags	N/A
Recommended	false
Options	excludeTags

The following patterns are considered problems:

/**  foo */
function quux () {

}
// Message: There must be no indentation.

/**
 * foo
 *
 * @param bar
 *  baz
 */
function quux () {

}
// Message: There must be no indentation.

/**
 * Foo
 *   bar
 */
class Moo {}
// Message: There must be no indentation.

/**
 * foo
 *
 * @example
 * anArray.filter((a) => {
 *   return a.b;
 * });
 */
function quux () {

}
// "jsdoc/check-indentation": ["error"|"warn", {"excludeTags":[]}]
// Message: There must be no indentation.

/**
 * foo
 *
 * @example
 *   aaaa
 * @returns
 *   eeee
 */
function quux () {

}
// Message: There must be no indentation.

/**
 * foo
 * ```html
 * <section>
 *   <title>test</title>
 * </section>
 * ```
 * @returns
 *   eeee
 */
function quux () {

}
// Message: There must be no indentation.

/**
 * foo
 * ```   aaaa```
 * @returns
 *   eeee
 */
function quux () {

}
// Message: There must be no indentation.

/**
* @example <caption>
* Here is a long
*   indented summary of this
* example
* </caption>
* ```js
* function hi () {
*   alert('Hello');
* }
* ```
*/
// "jsdoc/check-indentation": ["error"|"warn", {"excludeTags":[]}]
// Message: There must be no indentation.

/**
* @example <caption>
* Here is a long
* summary of this
* example
* </caption>
* // Code is not wrapped into fenced code block
* function hi () {
*   alert('Hello');
* }
*/
// "jsdoc/check-indentation": ["error"|"warn", {"excludeTags":[]}]
// Message: There must be no indentation.

The following patterns are not considered problems:

/**
 * foo
 *
 * @param bar
 * baz
 */
function quux () {

}

/*** foo */
function quux () {

}

/**
 * foo
 *
 * @example
 * anArray.filter((a) => {
 *   return a.b;
 * });
 */
function quux () {

}

/**
 * foo
 *
 * @example
 * anArray.filter((a) => {
 *   return a.b;
 * });
 * @returns
 *   eeee
 */
function quux () {

}
// "jsdoc/check-indentation": ["error"|"warn", {"excludeTags":["example","returns"]}]

/**
 * foo
 * ```html
 * <section>
 *   <title>test</title>
 * </section>
 * ```
 * @returns eeee
 */
function quux () {

}

/**
 * foo
 * ```   aaaa```
 * @returns eeee
 */
function quux () {

}

/**
* @example <caption>
* Here is a long
* summary of this
* example
* </caption>
* ```js
* function hi () {
*   alert('Hello');
* }
* ```
*/
// "jsdoc/check-indentation": ["error"|"warn", {"excludeTags":[]}]

/**
 * @example
 * ```
 * @MyDecorator({
 *   myOptions: 42
 * })
 * export class MyClass {}
 * ```
 */
function MyDecorator(options: { myOptions: number }) {
  return (Base: Function) => {};
}
// "jsdoc/check-indentation": ["error"|"warn", {"excludeTags":["example","MyDecorator"]}]

/**
 * @example ```
 * @MyDecorator({
 *   myOptions: 42
 * })
 * export class MyClass {}
 * ```
 */
function MyDecorator(options: { myOptions: number }) {
  return (Base: Function) => {};
}

check-line-alignment

Reports invalid alignment of JSDoc block lines. This is a standard recommended to WordPress code, for example.

Options

This rule allows one optional string argument. If it is "always" then a problem is raised when the lines are not aligned. If it is "never" then a problem should be raised when there is more than one space between each line's parts. Defaults to "never".

Note that in addition to alignment, both options will ensure at least one space is present after the asterisk delimiter.

After the string, an options object is allowed with the following properties.

tags

Use this to change the tags which are sought for alignment changes. Currently only works with the "never" option. Defaults to an array of ['param', 'arg', 'argument', 'property', 'prop', 'returns', 'return'].

customSpacings

An object with any of the following keys set to an integer. Affects spacing:

• postDelimiter - after the asterisk (e.g., * @param)
• postTag - after the tag (e.g., * @param )
• postType - after the type (e.g., * @param {someType} )
• postName - after the name (e.g., * @param {someType} name )

If a spacing is not defined, it defaults to one.

Context	everywhere
Options	(a string matching "always" or "never" and optional object with tags and customSpacings)
Tags	param, property, returns and others added by tags
Aliases	arg, argument, prop, return
Recommended	false

The following patterns are considered problems:

/**
 * Function description.
 *
 * @param {string} lorem Description.
 * @param {int} sit Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * With tabs.
 *
 * @param {string} lorem Description.
 * @param {int} sit Description multi words.
 */
    const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Function description.
 *
 * @param {string} lorem - Description.
 * @param {int} sit - Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Function description.
 *
 * @param {string} lorem Description.
 * @param {int} sit Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Function description.
 *
 * @param  {string} lorem Description.
 *  @param {int}    sit   Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Function description.
 *
 * @param  {string} lorem Description.
  * @param {int}    sit   Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Function description.
 *
 * @param  {string} lorem Description.
 * @param  {int}    sit   Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Function description.
 *
 * @param {string} lorem Description.
 * @param {int} sit Description multi words.
 */
function fn( lorem, sit ) {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

const object = {
  /**
   * Function description.
   *
   * @param {string} lorem Description.
   * @param {int} sit Description multi words.
   */
  fn( lorem, sit ) {}
}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

class ClassName {
  /**
   * Function description.
   *
   * @param {string} lorem Description.
   * @param {int} sit Description multi words.
   */
  fn( lorem, sit ) {}
}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Function description.
 *
 * @arg {string} lorem Description.
 * @arg {int} sit Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * @namespace
 * @property {object} defaults Description.
 * @property {int} defaults.lorem Description multi words.
 */
const config = {
    defaults: {
        lorem: 1
    }
}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * My object.
 *
 * @typedef {Object} MyObject
 *
 * @property {string} lorem Description.
 * @property {int} sit Description multi words.
 */
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * My object.
 *
 * @typedef {Object} MyObject
 *
 * @property {{a: number, b: string, c}} lorem Description.
 * @property {Object.<string, Class>} sit Description multi words.
 * @property {Object.<string, Class>} amet Description} weird {multi} {{words}}.
 * @property {Object.<string, Class>} dolor
 */
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * My object.
 *
 * @typedef {Object} MyObject
 *
 * @property {{a: number, b: string, c}} lorem Description.
 * @property {Object.<string, Class>} sit Description multi words.
 * @property {Object.<string, Class>} amet Description} weird {multi} {{words}}.
 * @property {Object.<string, Class>} dolor
 */
// "jsdoc/check-line-alignment": ["error"|"warn", "always",{"tags":["typedef","property"]}]
// Message: Expected JSDoc block lines to be aligned.

/**
 * My function.
 *
 * @param {string} lorem  Description.
 * @param {int}    sit    Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never"]
// Message: Expected JSDoc block lines to not be aligned.

/**
 * My function.
 *
 * @param {string} lorem Description.
 * @param   {int}    sit   Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never"]
// Message: Expected JSDoc block lines to not be aligned.

/**
 * My function.
 *
 * @param {string} lorem Description.
 * @param   {int}    sit
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never"]
// Message: Expected JSDoc block lines to not be aligned.

/**
 * My function.
 *
 * @param {string} lorem Description.
 * @param   {int}    sit
 */
const fn = ( lorem, sit ) => {}
// Message: Expected JSDoc block lines to not be aligned.

/**
 * Function description.
 *
 * @param {string} lorem Description.
 * @param {int} sit Description multi
   line without *.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * My function.
 *
 * @param {string} lorem Description.
 * @param   {int}    sit
 *
 * @return  {string}  Return description
 *    with multi line, but don't touch.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always",{"tags":["param"]}]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Only return doc.
 *
 * @return {boolean}  Return description.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Creates OS based shortcuts for files, folders, and applications.
 *
 * @param  {object}  options  Options object for each OS.
 * @return {boolean}          True = success, false = failed to create the icon
 */
 function quux () {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never"]
// Message: Expected JSDoc block lines to not be aligned.

/**
 * Creates OS based shortcuts for files, folders, and applications.
 *
 * @param {object} options Options object for each OS.
 * @return {boolean}          True = success, false = failed to create the icon
 */
 function quux () {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never"]
// Message: Expected JSDoc block lines to not be aligned.

/**
 * Creates OS based shortcuts for files, folders, and applications.
 *
 * @param {object} options Options object for each OS.
 * @return  True = success, false = failed to create the icon
 */
 function quux () {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never"]
// Message: Expected JSDoc block lines to not be aligned.

/**
 * Creates OS based shortcuts for files, folders, and applications.
 *
 * @param  options Options object for each OS.
 * @return True = success, false = failed to create the icon
 */
 function quux () {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never"]
// Message: Expected JSDoc block lines to not be aligned.

/**
 * Creates OS based shortcuts for files, folders, and applications.
 *
 * @param {object} options Options object for each OS.
 * @param {object} other Other.
 * @return  True = success, false = failed to create the icon
 */
 function quux () {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never",{"tags":["param","return"]}]
// Message: Expected JSDoc block lines to not be aligned.

/**
 * Returns the value stored in the process.env for a given
 * environment variable.
 *
 * @param  {string} withPercents    '%USERNAME%'
 * @param  {string} withoutPercents 'USERNAME'
 * @return {string}                 'bob' || '%USERNAME%'
 */
function quux () {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never"]
// Message: Expected JSDoc block lines to not be aligned.

/**
 * Function description
 *           description with post delimiter.
 *
 * @param {string} lorem Description.
 * @param {int}    sit   Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Function description.
 *
 * @param  {string} lorem Description.
 * @param  {int}    sit   Description multi words.
 *
 * @return {string}       Return description.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always",{"customSpacings":{"postDelimiter":2,"postTag":3,"postType":2}}]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Function description.
 *
 * @param  {string} lorem Description.
 * @param  {int}    sit   Description multi words.
 *
 * @return {string}       Return description.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always",{"customSpacings":{"postName":3}}]
// Message: Expected JSDoc block lines to be aligned.

/**
 * Function description.
 *
 *  @param   {string}  lorem Description.
 * @param {int} sit Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never",{"customSpacings":{"postDelimiter":2,"postTag":3,"postType":2}}]
// Message: Expected JSDoc block lines to not be aligned.

/**
 * Function description.
 *
 * @param {string} lorem   Description.
 * @param {int} sit Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never",{"customSpacings":{"postName":3}}]
// Message: Expected JSDoc block lines to not be aligned.


       /**
        * Function description.
        *
        * @param {string} lorem Description.
        * @param {int} sit Description multi words.
        * @param {string} sth   Multi
        *                       line description.
        */
       const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]
// Message: Expected JSDoc block lines to be aligned.

The following patterns are not considered problems:

/**
 * Function description.
 *
 * @param {string} lorem Description.
 * @param {int}    sit   Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * With tabs.
 *
 * @param {string} lorem Description.
 * @param {int}    sit   Description multi words.
 */
    const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * Function description.
 *
 * @param {string} lorem - Description.
 * @param {int}    sit   - Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * @param {string} lorem Description.
 * @param {int}    sit
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * @param {int}    sit
 * @param {string} lorem Description.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * No params.
 */
const fn = () => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * Function description.
 *
 * @param {string} lorem Description.
 * @param {int}    sit   Description multi words.
 */
function fn( lorem, sit ) {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

const object = {
  /**
   * Function description.
   *
   * @param {string} lorem Description.
   * @param {int}    sit   Description multi words.
   */
  fn( lorem, sit ) {},
}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

class ClassName {
  /**
   * Function description.
   *
   * @param {string} lorem Description.
   * @param {int}    sit   Description multi words.
   */
  fn( lorem, sit ) {}
}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * Function description.
 *
 * @arg {string} lorem Description.
 * @arg {int}    sit   Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * @namespace
 * @property {object} defaults       Description.
 * @property {int}    defaults.lorem Description multi words.
 */
const config = {
    defaults: {
        lorem: 1
    }
}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * My object.
 *
 * @typedef {Object} MyObject
 *
 * @property {string} lorem Description.
 * @property {int}    sit   Description multi words.
 */
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * My object.
 *
 * @typedef {Object} MyObject
 *
 * @property {{a: number, b: string, c}} lorem Description.
 * @property {Object.<string, Class>}    sit   Description multi words.
 * @property {Object.<string, Class>}    amet  Description} weird {multi} {{words}}.
 * @property {Object.<string, Class>}    dolor
 */
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * My object.
 *
 * @typedef  {Object}                    MyObject
 *
 * @property {{a: number, b: string, c}} lorem    Description.
 * @property {Object.<string, Class>}    sit      Description multi words.
 * @property {Object.<string, Class>}    amet     Description} weird {multi} {{words}}.
 * @property {Object.<string, Class>}    dolor
 */
// "jsdoc/check-line-alignment": ["error"|"warn", "always",{"tags":["typedef","property"]}]

/**
 * My object.
 *
 * @template                             T
 * @template                             W,X,Y,Z
 * @template {string}                    K               - K must be a string or string literal
 * @template {{ serious(): string }}     Seriousalizable - must have a serious method
 *
 * @param    {{a: number, b: string, c}} lorem           Description.
 */
// "jsdoc/check-line-alignment": ["error"|"warn", "always",{"tags":["template","param"]}]

/** @param {number} lorem */
const fn = ( lorem ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * Creates OS based shortcuts for files, folders, and applications.
 *
 * @param  {object}  options Options object for each OS.
 * @return {boolean}         True = success, false = failed to create the icon
 */
 function quux () {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * Creates OS based shortcuts for files, folders, and applications.
 *
 * @param  {object}  options Options object for each OS.
 * @return {boolean}
 */
 function quux () {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * Only return doc.
 *
 * @return {boolean} Return description.
 */
 function quux () {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

/**
 * Not validating without option.
 *
 * @param {string} lorem Description.
 * @param {int} sit Description multi words.
 */
const fn = ( lorem, sit ) => {}

/**
 * Creates OS based shortcuts for files, folders, and applications.
 *
 * @param {object} options Options object for each OS.
 * @return {boolean} True = success, false = failed to create the icon
 */
function quux (options) {}

/**
 * Creates OS based shortcuts for files, folders, and applications.
 *
 * @param {object} options Options object for each OS.
 * @param {object} other Other.
 * @return  True = success, false = failed to create the icon
 */
 function quux () {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never",{"tags":["param"]}]

/**
 * @param parameter Description.
 */
function func(parameter){

}

/**
 * Function description
 *           description with post delimiter.
 *
 * @param {string} lorem Description.
 * @param {int}    sit   Description multi words.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always",{"preserveMainDescriptionPostDelimiter":true}]

/**
 * Function description.
 *
 *  @param    {string}  lorem Description.
 *  @param    {int}     sit   Description multi words.
 *
 *  @return   {string}        Return description.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always",{"customSpacings":{"postDelimiter":2,"postTag":3,"postType":2}}]

/**
 * Function description.
 *
 *  @param   {string}  lorem Description.
 *  @param   {int}  sit Description multi words.
 *
 *  @return   {string}  Return description.
 */
const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "never",{"customSpacings":{"postDelimiter":2,"postTag":3,"postType":2}}]

/**
 * @param {{
 *        ids: number[]
 *        }}            params
 */
const fn = ({ids}) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]


       /**
        * Function description.
        *
        * @param {string} lorem Description.
        * @param {int}    sit   Description multi words.
        * @param {string} sth   Multi
        *                       line description.
        */
       const fn = ( lorem, sit ) => {}
// "jsdoc/check-line-alignment": ["error"|"warn", "always"]

check-param-names

Ensures that parameter names in JSDoc match those in the function declaration.

Destructuring

Note that by default the rule will not report parameters present on the docs but non-existing on the function signature when an object rest property is part of that function signature since the seemingly non-existing properties might actually be a part of the object rest property.

/**
 * @param options
 * @param options.foo
 */
function quux ({foo, ...extra}) {}

To require that extra be documented--and that any extraneous properties get reported--e.g., if there had been a @param options.bar above--you can use the checkRestProperty option which insists that the rest property be documented (and that there be no other implicit properties). Note, however, that jsdoc does not appear to currently support syntax or output to distinguish rest properties from other properties, so in looking at the docs alone without looking at the function signature, the disadvantage of enabling this option is that it may appear that there is an actual property named extra.

Options

checkRestProperty

See the "Destructuring" section. Defaults to false.

checkTypesPattern

See require-param under the option of the same name.

enableFixer

Set to true to auto-remove @param duplicates (based on identical names).

Note that this option will remove duplicates of the same name even if the definitions do not match in other ways (e.g., the second param will be removed even if it has a different type or description).

allowExtraTrailingParamDocs

If set to true, this option will allow extra @param definitions (e.g., representing future expected or virtual params) to be present without needing their presence within the function signature. Other inconsistencies between @param's and present function parameters will still be reported.

checkDestructured

Whether to check destructured properties. Defaults to true.

useDefaultObjectProperties

Set to true if you wish to avoid reporting of child property documentation where instead of destructuring, a whole plain object is supplied as default value but you wish its keys to be considered as signalling that the properties are present and can therefore be documented. Defaults to false.

disableExtraPropertyReporting

Whether to check for extra destructured properties. Defaults to false. Change to true if you want to be able to document properties which are not actually destructured. Keep as false if you expect properties to be documented in their own types. Note that extra properties will always be reported if another item at the same level is destructured as destructuring will prevent other access and this option is only intended to permit documenting extra properties that are available and actually used in the function.

Context	ArrowFunctionExpression, FunctionDeclaration, FunctionExpression
Options	allowExtraTrailingParamDocs, checkDestructured, checkRestProperty, checkTypesPattern, useDefaultObjectProperties, disableExtraPropertyReporting
Tags	param
Aliases	arg, argument
Recommended	true
The following patterns are considered problems:

/**
 * @param Foo
 */
function quux (foo = 'FOO') {

}
// Message: Expected @param names to be "foo". Got "Foo".

/**
 * @arg Foo
 */
function quux (foo = 'FOO') {

}
// Settings: {"jsdoc":{"tagNamePreference":{"param":"arg"}}}
// Message: Expected @arg names to be "foo". Got "Foo".

/**
 * @param Foo
 */
function quux (foo) {

}
// Message: Expected @param names to be "foo". Got "Foo".

/**
 * @param Foo.Bar
 */
function quux (foo) {

}
// Message: @param path declaration ("Foo.Bar") appears before any real parameter.

/**
 * @param foo
 * @param Foo.Bar
 */
function quux (foo) {

}
// Message: @param path declaration ("Foo.Bar") root node name ("Foo") does not match previous real parameter name ("foo").

/**
 * Assign the project to a list of employees.
 * @param {string} employees[].name - The name of an employee.
 * @param {string} employees[].department - The employee's department.
 */
function assign (employees) {

};
// Message: @param path declaration ("employees[].name") appears before any real parameter.

/**
 * Assign the project to a list of employees.
 * @param {string} employees[].name - The name of an employee.
 * @param {string} employees[].name - The employee's department.
 */
function assign (employees) {

};
// "jsdoc/check-param-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @param "employees[].name"

/**
 * @param foo
 * @param foo.bar
 * @param bar
 */
function quux (bar, foo) {

}
// Message: Expected @param names to be "bar, foo". Got "foo, bar".

/**
 * @param foo
 * @param bar
 */
function quux (foo) {

}
// Message: @param "bar" does not match an existing function parameter.

/**
 * @param foo
 * @param foo
 */
function quux (foo) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @param "foo"

class bar {
    /**
     * @param foo
     * @param foo
     */
    quux (foo) {

    }
}
// "jsdoc/check-param-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @param "foo"

/**
 * @param foo
 * @param foo
 */
function quux (foo, bar) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @param "foo"

/**
 * @param foo
 * @param foo
 */
function quux (foo, foo) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @param "foo"

/**
 * @param cfg
 * @param cfg.foo
 * @param cfg.foo
 */
function quux ({foo}) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @param "cfg.foo"

/**
 * @param cfg
 * @param cfg.foo
 * @param cfg.foo
 */
function quux ({foo}) {

}
// Message: Duplicate @param "cfg.foo"

/**
 * @param cfg
 * @param cfg.foo
 */
function quux ({foo, bar}) {

}
// Message: Missing @param "cfg.bar"

/**
 * @param cfg
 * @param cfg.foo
 * @param [cfg.foo]
 * @param baz
 */
function quux ({foo}, baz) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @param "cfg.foo"

/**
 * @param cfg
 * @param cfg.foo
 * @param [cfg.foo="with a default"]
 * @param baz
 */
function quux ({foo, bar}, baz) {

}
// Message: Missing @param "cfg.bar"

/**
 * @param cfg
 * @param cfg.foo
 * @param [cfg.foo="with a default"]
 * @param baz
 */
function quux ({foo}, baz) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @param "cfg.foo"

/**
 * @param cfg
 * @param [cfg.foo="with a default"]
 * @param baz
 */
function quux ({foo, bar}, baz) {

}
// Message: Missing @param "cfg.bar"

/**
 * @param args
 */
function quux ({a, b}) {

}
// Message: Missing @param "args.a"

/**
 * @param args
 */
function quux ({a, b} = {}) {

}
// Message: Missing @param "args.a"

export class SomeClass {
  /**
   * @param prop
   */
  constructor(private property: string) {}
}
// Message: Expected @param names to be "property". Got "prop".

export class SomeClass {
  /**
   * @param prop
   * @param prop.foo
   */
  constructor(prop: { foo: string, bar: string }) {}
}
// Message: Missing @param "prop.bar"

export class SomeClass {
  /**
   * @param prop
   * @param prop.foo
   * @param prop.bar
   */
  constructor(options: { foo: string, bar: string }) {}
}
// Message: @param "prop" does not match parameter name "options"

export class SomeClass {
  /**
   * @param options
   * @param options.foo
   * @param options.bar
   */
  constructor(options: { foo: string }) {}
}
// Message: @param "options.bar" does not exist on options

/**
 * @param foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"param":false}}}
// Message: Unexpected tag `@param`

/**
 * @param {Error} error Exit code
 * @param {number} [code = 1] Exit code
 */
function quux (error, cde = 1) {
};
// Message: Expected @param names to be "error, cde". Got "error, code".

/**
 * @param foo
 */
function quux ([a, b] = []) {

}
// Message: Missing @param "foo."0""

/**
 * @param options
 * @param options.foo
 */
function quux ({foo, ...extra}) {
}
// "jsdoc/check-param-names": ["error"|"warn", {"checkRestProperty":true}]
// Message: Missing @param "options.extra"

/**
 * @param cfg
 * @param cfg.foo
 * @param cfg.bar
 * @param cfg.extra
 */
function quux ({foo, ...extra}) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"checkRestProperty":true}]
// Message: @param "cfg.bar" does not exist on cfg

/**
 * Converts an SVGRect into an object.
 * @param {SVGRect} bbox - a SVGRect
 */
const bboxToObj = function ({x, y, width, height}) {
  return {x, y, width, height};
};
// "jsdoc/check-param-names": ["error"|"warn", {"checkTypesPattern":"SVGRect"}]
// Message: Missing @param "bbox.x"

/**
 * Converts an SVGRect into an object.
 * @param {object} bbox - a SVGRect
 */
const bboxToObj = function ({x, y, width, height}) {
  return {x, y, width, height};
};
// Message: Missing @param "bbox.x"

module.exports = class GraphQL {
  /**
   * @param fetchOptions
   * @param cacheKey
   */
  fetch = ({ url, ...options }, cacheKey) => {
  }
};
// "jsdoc/check-param-names": ["error"|"warn", {"checkRestProperty":true}]
// Message: Missing @param "fetchOptions.url"

/**
 * Testing
 *
 * @param options
 * @param options.one One
 * @param options.two Two
 * @param options.four Four
 */
function testingEslint(options: {
  one: string;
  two: string;
  three: string;
}): string {
  return one + two + three;
}
// Message: Missing @param "options.three"

/**
 *
 */
function quux() {

}
// Settings: {"jsdoc":{"structuredTags":{"see":{"name":false,"required":["name"]}}}}
// Message: Cannot add "name" to `require` with the tag's `name` set to `false`

/**
 * @param root
 * @param foo
 */
function quux ({foo, bar}, baz) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"checkDestructured":false}]
// Message: Expected @param names to be "root, baz". Got "root, foo".

/**
 * Description.
 * @param {Object} options
 * @param {FooBar} foo
 */
function quux ({ foo: { bar } }) {}
// Message: Missing @param "options.foo"

/**
 * Description.
 * @param {Object} options
 * @param options.foo
 */
function quux ({ foo: { bar } }) {}
// Message: Missing @param "options.foo.bar"

/**
 * Description.
 * @param {object} options Options.
 * @param {object} options.foo A description.
 * @param {object} options.foo.bar
 */
function foo({ foo: { bar: { baz } }}) {}
// Message: Missing @param "options.foo.bar.baz"

/**
* Returns a number.
* @param {Object} props Props.
* @param {Object} props.prop Prop.
* @param {string} props.prop.a String.
* @param {string} props.prop.b String.
* @return {number} A number.
*/
export function testFn1 ({ prop = { a: 1, b: 2 } }) {
}
// "jsdoc/check-param-names": ["error"|"warn", {"useDefaultObjectProperties":false}]
// Message: @param "props.prop.a" does not exist on props

/**
 * @param {object} cfg
 * @param {string} cfg.foo
 * @param {string} cfg.bar
 * @param {object} cfg.extra
 */
function quux ({foo}) {

}
// Message: @param "cfg.bar" does not exist on cfg

/**
 * @param {object} cfg
 * @param {string} cfg.foo
 * @param {string} cfg.bar
 * @param {object} cfg.extra
 */
function quux ({foo}) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"disableExtraPropertyReporting":true}]
// Message: @param "cfg.bar" does not exist on cfg

/**
 * @param {object} root
 * @param {object} root.cfg
 * @param {object} root.cfg.a
 * @param {string} root.cfg.a.foo
 * @param {string} root.cfg.a.bar
 * @param {object} root.cfg.a.extra
 */
function quux ({cfg: {a: {foo}}}) {

}
// Message: @param "root.cfg.a.bar" does not exist on root

/**
 * @param {object} root
 * @param {object} root.cfg
 * @param {object} root.cfg.a
 * @param {string} root.cfg.a.foo
 * @param {string} root.cfg.a.bar
 * @param {object} root.cfg.a.extra
 */
function quux ({cfg: {a: {foo}}}) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"disableExtraPropertyReporting":true}]
// Message: @param "root.cfg.a.bar" does not exist on root

/**
 * @param {object} root
 * @param {object} root.cfg
 * @param {string} root.cfg.foo
 * @param {string} root.cfg.bar
 * @param {object} root.cfg.extra
 */
function quux ({cfg}) {

}
// Message: @param "root.cfg.foo" does not exist on root

/**
 * @param foo
 * @param foo
 *   on another line
 */
function quux (foo) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @param "foo"

The following patterns are not considered problems:

/**
 *
 */
function quux (foo) {

}

/**
 * @param foo
 */
function quux (foo) {

}

/**
 * @param foo
 * @param bar
 */
function quux (foo, bar) {

}

/**
 * @param foo
 * @param bar
 */
function quux (foo, bar, baz) {

}

/**
 * @param foo
 * @param foo.foo
 * @param bar
 */
function quux (foo, bar) {

}

/**
 * @param args
 */
function quux (...args) {

}

/**
 * @param foo
 * @param foo.a
 * @param foo.b
 */
function quux ({a, b}) {

}

/**
 * @param foo
 * @param foo.a
 * @param foo.b
 */
function quux ({"a": A, b}) {

}

/**
 * @param foo
 * @param foo."a"
 * @param foo.b
 */
function quux ({a: A, b}) {

}

/**
 * @param foo
 * @param foo."a-b"
 * @param foo.b
 */
function quux ({"a-b": A, b}) {

}

/**
 * @param foo
 * @param foo.bar
 * @param foo.baz
 * @param bar
 */
function quux (foo, bar) {

}

/**
 * Assign the project to a list of employees.
 * @param {object[]} employees - The employees who are responsible for the project.
 * @param {string} employees[].name - The name of an employee.
 * @param {string} employees[].department - The employee's department.
 */
function assign (employees) {

};

export class SomeClass {
  /**
   * @param property
   */
  constructor(private property: string) {}
}

export class SomeClass {
  /**
   * @param options
   * @param options.foo
   * @param options.bar
   */
  constructor(options: { foo: string, bar: string }) {}
}

export class SomeClass {
  /**
   * @param options
   * @param options.foo
   * @param options.bar
   */
  constructor({ foo, bar }: { foo: string, bar: string }) {}
}

export class SomeClass {
  /**
   * @param options
   * @param options.foo
   * @param options.bar
   */
  constructor({ foo, bar }: { foo: string, bar: string }) {}
}

/**
 * @param {Error} error Exit code
 * @param {number} [code = 1] Exit code
 */
function quux (error, code = 1) {
};

/**
 * @param foo
 * @param bar
 */
function quux (foo) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"allowExtraTrailingParamDocs":true}]

/**
 * @param cfg
 * @param cfg.foo
 * @param baz
 */
function quux ({foo}, baz) {

}

/**
 * @param cfg
 * @param cfg.foo
 * @param cfg2
 */
function quux ({foo}, cfg2) {

}

/**
 * @param cfg
 * @param cfg.foo
 * @param baz
 * @param baz.cfg
 */
function quux ({foo}, {cfg}) {

}

/**
 * @param options
 * @param options.foo
 */
function quux ({foo, ...extra}) {
}

/**
 * @param foo
 * @param bar
 */
function quux (foo, bar, ...extra) {

}

/**
* Converts an SVGRect into an object.
* @param {SVGRect} bbox - a SVGRect
*/
const bboxToObj = function ({x, y, width, height}) {
  return {x, y, width, height};
};

/**
* Converts an SVGRect into an object.
* @param {SVGRect} bbox - a SVGRect
*/
const bboxToObj = function ({x, y, width, height}) {
  return {x, y, width, height};
};

/**
* Converts an SVGRect into an object.
* @param {object} bbox - a SVGRect
*/
const bboxToObj = function ({x, y, width, height}) {
  return {x, y, width, height};
};
// "jsdoc/check-param-names": ["error"|"warn", {"checkTypesPattern":"SVGRect"}]

class CSS {
  /**
   * Set one or more CSS properties for the set of matched elements.
   *
   * @param {Object} propertyObject - An object of property-value pairs to set.
   */
  setCssObject(propertyObject: {[key: string]: string | number}): void {
  }
}

/**
 * Logs a string.
 *
 * @param input - String to output.
 */
export default function (input: {
  [foo: string]: { a: string; b: string };
}): void {
  input;
}

export class Thing {
  foo: any;

  /**
   * @param {} C
   */
  constructor(C: { new (): any }) {
    this.foo = new C();
  }
}

/**
 * @param foo
 * @param root
 */
function quux (foo, {bar}) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"checkDestructured":false}]

class A {
  /**
   * Show a prompt.
   * @param hideButton true if button should be hidden, false otherwise
   * @param onHidden delegate to call when the prompt is hidden
   */
  public async showPrompt(hideButton: boolean, onHidden: {(): void}): Promise<void>
  {
  }
}

/**
 * Description.
 * @param {Object} options Options.
 * @param {FooBar} options.foo foo description.
 */
function quux ({ foo: { bar }}) {}

/**
 * Description.
 * @param {FooBar} options
 * @param {Object} options.foo
 */
function quux ({ foo: { bar } }) {}
// "jsdoc/check-param-names": ["error"|"warn", {"checkTypesPattern":"FooBar"}]

/**
 * Description.
 * @param {Object} options
 * @param {FooBar} options.foo
 * @param {FooBar} options.baz
 */
function quux ({ foo: { bar }, baz: { cfg } }) {}

/**
 * Item
 *
 * @param {object} props
 * @param {object} props.data - case data
 * @param {string} props.data.className - additional css class
 * @param props.val
 */
export default function Item({
  data: {
    className,
  } = {},
  val = 4
}) {
}

/**
 * @param obj
 * @param obj.data
 * @param obj.data."0"
 * @param obj.data."1"
 * @param obj.data."2"
 * @param obj.defaulting
 * @param obj.defaulting."0"
 * @param obj.defaulting."1"
 */
function Item({
  data: [foo, bar, ...baz],
  defaulting: [quux, xyz] = []
}) {
}

/**
* Returns a number.
* @param {Object} props Props.
* @param {Object} props.prop Prop.
* @param {string} props.prop.a String.
* @param {string} props.prop.b String.
* @return {number} A number.
*/
export function testFn1 ({ prop = { a: 1, b: 2 } }) {
}
// "jsdoc/check-param-names": ["error"|"warn", {"useDefaultObjectProperties":true}]

/**
 * @param {object} root
 * @param {object} root.cfg
 * @param {string} root.cfg.foo
 * @param {string} root.cfg.bar
 * @param {object} root.cfg.extra
 */
function quux ({cfg}) {

}
// "jsdoc/check-param-names": ["error"|"warn", {"disableExtraPropertyReporting":true}]

class A {
    /**
     * @param cfg
     * @param cfg.abc
     */
    constructor({
        [new.target.prop]: cX,
        abc
    }) {
    }
}

/**
 * @param root
 * @param root."0" Ignored
 * @param root."1" Our "b"
 */
const foo = ([, b]) => b;

check-property-names

Ensures that property names in JSDoc are not duplicated on the same block and that nested properties have defined roots.

Options

enableFixer

Set to true to auto-remove @property duplicates (based on identical names).

Note that this option will remove duplicates of the same name even if the definitions do not match in other ways (e.g., the second property will be removed even if it has a different type or description).

Context	Everywhere
Options	enableFixer
Tags	property
Aliases	prop
Recommended	true

The following patterns are considered problems:

/**
 * @typedef (SomeType) SomeTypedef
 * @property Foo.Bar
 */
// Message: @property path declaration ("Foo.Bar") appears before any real property.

/**
 * @typedef (SomeType) SomeTypedef
 * @property foo
 * @property Foo.Bar
 */
// Message: @property path declaration ("Foo.Bar") root node name ("Foo") does not match previous real property name ("foo").

/**
 * Assign the project to a list of employees.
 * @typedef (SomeType) SomeTypedef
 * @property {string} employees[].name - The name of an employee.
 * @property {string} employees[].department - The employee's department.
 */
// Message: @property path declaration ("employees[].name") appears before any real property.

/**
 * Assign the project to a list of employees.
 * @typedef (SomeType) SomeTypedef
 * @property {string} employees[].name - The name of an employee.
 * @property {string} employees[].name - The employee's department.
 */
// "jsdoc/check-property-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @property "employees[].name"

/**
 * @typedef (SomeType) SomeTypedef
 * @property foo
 * @property foo
 */
// "jsdoc/check-property-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @property "foo"

/**
 * @typedef (SomeType) SomeTypedef
 * @property foo
 * @property foo
 */
// Message: Duplicate @property "foo"

/**
 * @typedef (SomeType) SomeTypedef
 * @property cfg
 * @property cfg.foo
 * @property cfg.foo
 */
function quux ({foo, bar}) {

}
// "jsdoc/check-property-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @property "cfg.foo"

class Test {
    /**
     * @typedef (SomeType) SomeTypedef
     * @property cfg
     * @property cfg.foo
     * @property cfg.foo
     */
    quux ({foo, bar}) {

    }
}
// "jsdoc/check-property-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @property "cfg.foo"

/**
 * @typedef (SomeType) SomeTypedef
 * @property cfg
 * @property cfg.foo
 * @property [cfg.foo]
 * @property baz
 */
function quux ({foo, bar}, baz) {

}
// "jsdoc/check-property-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @property "cfg.foo"

/**
 * @typedef (SomeType) SomeTypedef
 * @property cfg
 * @property cfg.foo
 * @property [cfg.foo="with a default"]
 * @property baz
 */
function quux ({foo, bar}, baz) {

}
// "jsdoc/check-property-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @property "cfg.foo"

/**
 * @typedef (SomeType) SomeTypedef
 * @prop foo
 * @prop foo
 */
// Settings: {"jsdoc":{"tagNamePreference":{"property":"prop"}}}
// "jsdoc/check-property-names": ["error"|"warn", {"enableFixer":true}]
// Message: Duplicate @prop "foo"

/**
 * @typedef (SomeType) SomeTypedef
 * @property foo
 */
// Settings: {"jsdoc":{"tagNamePreference":{"property":false}}}
// Message: Unexpected tag `@property`

The following patterns are not considered problems:

/**
 *
 */

/**
 * @typedef (SomeType) SomeTypedef
 * @property foo
 */

/**
 * @typedef (SomeType) SomeTypedef
 * @prop foo
 */

/**
 * @typedef (SomeType) SomeTypedef
 * @property foo
 * @property bar
 */

/**
 * @typedef (SomeType) SomeTypedef
 * @property foo
 * @property foo.foo
 * @property bar
 */

/**
 * Assign the project to a list of employees.
 * @typedef (SomeType) SomeTypedef
 * @property {object[]} employees - The employees who are responsible for the project.
 * @property {string} employees[].name - The name of an employee.
 * @property {string} employees[].department - The employee's department.
 */

/**
 * @typedef (SomeType) SomeTypedef
 * @property {Error} error Exit code
 * @property {number} [code = 1] Exit code
 */

/**
 * @namespace (SomeType) SomeNamespace
 * @property {Error} error Exit code
 * @property {number} [code = 1] Exit code
 */

/**
 * @class
 * @property {Error} error Exit code
 * @property {number} [code = 1] Exit code
 */
function quux (code = 1) {
  this.error = new Error('oops');
  this.code = code;
}

/**
 * @typedef (SomeType) SomeTypedef
 * @property foo
 * @property foo.bar
 * @property foo.baz
 * @property bar
 */

check-syntax

Reports against syntax not encouraged for the mode (e.g., Google Closure Compiler in "jsdoc" or "typescript" mode). Note that this rule will not check for types that are wholly invalid for a given mode, as that is covered by valid-types.

Currently checks against:

• Use of = in "jsdoc" or "typescript" mode

Note that "jsdoc" actually allows Closure syntax, but with another option available for optional parameters (enclosing the name in brackets), the rule is enforced (except under "permissive" and "closure" modes).

Context	everywhere
Tags	N/A
Recommended	false

The following patterns are considered problems:

/**
 * @param {string=} foo
 */
function quux (foo) {

}
// Message: Syntax should not be Google Closure Compiler style.

The following patterns are not considered problems:

/**
 * @param {string=} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"mode":"closure"}}

/**
 * @param {string} [foo]
 */
function quux (foo) {

}

/**
 *
 */
function quux (foo) {

}

check-tag-names

Reports invalid block tag names.

Valid JSDoc 3 Block Tags are:

abstract
access
alias
async
augments
author
borrows
callback
class
classdesc
constant
constructs
copyright
default
deprecated
description
enum
event
example
exports
external
file
fires
function
generator
global
hideconstructor
ignore
implements
inheritdoc
inner
instance
interface
kind
lends
license
listens
member
memberof
memberof!
mixes
mixin
module
name
namespace
override
package
param
private
property
protected
public
readonly
requires
returns
see
since
static
summary
this
throws
todo
tutorial
type
typedef
variation
version
yields

modifies is also supported (see source) but is undocumented.

The following synonyms are also recognized if you set them in tagNamePreference as a key (or replacement):

arg
argument
const
constructor
defaultvalue
desc
emits
exception
extends
fileoverview
func
host
method
overview
prop
return
var
virtual
yield

If you wish to allow in certain cases both a primary tag name and its alias(es), you can set a normally non-preferred tag name to itself to indicate that you want to allow both the default tag (in this case @returns) and a non-default (in this case return):

"tagNamePreference": {
    "return": "return",
}

Because the tags indicated as replacements in settings.jsdoc.tagNamePreference will automatically be considered as valid, the above works.

Likewise are the tag keys of settings.jsdoc.structuredTags automatically considered as valid (as their defining an expected structure for tags implies the tags may be used).

For TypeScript (or Closure), when settings.jsdoc.mode is set to typescript or closure, one may also use the following:

template

And for Closure, when settings.jsdoc.mode is set to closure, one may use the following (in addition to the jsdoc and TypeScript tags–though replacing returns with return):

define (synonym of `const` per jsdoc source)
dict
export
externs
final
implicitCast (casing distinct from that recognized by jsdoc internally)
inheritDoc (casing distinct from that recognized by jsdoc internally)
noalias
nocollapse
nocompile
noinline
nosideeffects
polymer
polymerBehavior
preserve
record (synonym of `interface` per jsdoc source)
struct
suppress
unrestricted

...and these undocumented tags which are only in source:

closurePrimitive
customElement
expose
hidden
idGenerator
meaning
mixinClass
mixinFunction
ngInject
owner
typeSummary
wizaction

Options

definedTags

Use an array of definedTags strings to configure additional, allowed tags. The format is as follows:

{
  "definedTags": ["note", "record"]
}

jsxTags

If this is set to true, all of the following tags used to control JSX output are allowed:

jsx
jsxFrag
jsxImportSource
jsxRuntime

For more information, see the babel documentation.

Context	everywhere
Tags	N/A
Recommended	true
Options	definedTags
Settings	tagNamePreference, mode

The following patterns are considered problems:

/** @typoo {string} */
let a;
// Message: Invalid JSDoc tag name "typoo".

/** @typoo {string} */
let a;
// Settings: {"jsdoc":{"structuredTags":{"parameter":{"name":"namepath-referencing","required":["type","name"],"type":true}}}}
// Message: Invalid JSDoc tag name "typoo".

/**
 * @Param
 */
function quux () {

}
// Message: Invalid JSDoc tag name "Param".

/**
 * @foo
 */
function quux () {

}
// Message: Invalid JSDoc tag name "foo".

/**
 * @arg foo
 */
function quux (foo) {

}
// Message: Invalid JSDoc tag (preference). Replace "arg" JSDoc tag with "param".

/**
 * @param foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"param":"arg"}}}
// Message: Invalid JSDoc tag (preference). Replace "param" JSDoc tag with "arg".

/**
 * @constructor foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"tag constructor":"cons"}}}
// Message: Invalid JSDoc tag (preference). Replace "constructor" JSDoc tag with "cons".

/**
 * @arg foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"arg":"somethingDifferent"}}}
// Message: Invalid JSDoc tag (preference). Replace "arg" JSDoc tag with "somethingDifferent".

/**
 * @param foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"param":"parameter"}}}
// Message: Invalid JSDoc tag (preference). Replace "param" JSDoc tag with "parameter".

/**
 * @bar foo
 */
function quux (foo) {

}
// Message: Invalid JSDoc tag name "bar".

/**
 * @baz @bar foo
 */
function quux (foo) {

}
// "jsdoc/check-tag-names": ["error"|"warn", {"definedTags":["bar"]}]
// Message: Invalid JSDoc tag name "baz".

/**
 * @bar
 * @baz
 */
function quux (foo) {

}
// "jsdoc/check-tag-names": ["error"|"warn", {"definedTags":["bar"]}]
// Message: Invalid JSDoc tag name "baz".

/**
 * @todo
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"todo":false}}}
// Message: Blacklisted tag found (`@todo`)

/**
 * @todo
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"todo":{"message":"Please resolve to-dos or add to the tracker"}}}}
// Message: Please resolve to-dos or add to the tracker

/**
 * @todo
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"todo":{"message":"Please use x-todo instead of todo","replacement":"x-todo"}}}}
// Message: Please use x-todo instead of todo

/**
 * @todo
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"todo":{"message":"Please use x-todo instead of todo","replacement":"x-todo"}}}}
// Message: Please use x-todo instead of todo

/**
 * @todo
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"todo":55}}}
// Message: Invalid `settings.jsdoc.tagNamePreference`. Values must be falsy, a string, or an object.

/**
 * @property {object} a
 * @prop {boolean} b
 */
function quux () {

}
// Message: Invalid JSDoc tag (preference). Replace "prop" JSDoc tag with "property".

/**
 * @abc foo
 * @abcd bar
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"abc":"abcd"}}}
// "jsdoc/check-tag-names": ["error"|"warn", {"definedTags":["abcd"]}]
// Message: Invalid JSDoc tag (preference). Replace "abc" JSDoc tag with "abcd".

/**
 * @abc
 * @abcd
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"abc":"abcd"}}}
// Message: Invalid JSDoc tag (preference). Replace "abc" JSDoc tag with "abcd".

/**
 * @returns
 */
function quux (foo) {}
// Settings: {"jsdoc":{"mode":"closure"}}
// Message: Invalid JSDoc tag (preference). Replace "returns" JSDoc tag with "return".

/** 
 * @modifies
 * @abstract
 * @access
 * @alias
 * @async
 * @augments
 * @author
 * @borrows
 * @callback
 * @class
 * @classdesc
 * @constant
 * @constructs
 * @copyright
 * @default
 * @deprecated
 * @description
 * @enum
 * @event
 * @example
 * @exports
 * @external
 * @file
 * @fires
 * @function
 * @generator
 * @global
 * @hideconstructor
 * @ignore
 * @implements
 * @inheritdoc
 * @inheritDoc
 * @inner
 * @instance
 * @interface
 * @kind
 * @lends
 * @license
 * @listens
 * @member
 * @memberof
 * @memberof!
 * @mixes
 * @mixin
 * @module
 * @name
 * @namespace
 * @override
 * @package
 * @param
 * @private
 * @property
 * @protected
 * @public
 * @readonly
 * @requires
 * @returns
 * @see
 * @since
 * @static
 * @summary
 * @this
 * @throws
 * @todo
 * @tutorial
 * @type
 * @typedef
 * @variation
 * @version
 * @yields
 */
function quux (foo) {}
// Settings: {"jsdoc":{"mode":"badMode"}}
// Message: Unrecognized value `badMode` for `settings.jsdoc.mode`.

/** 
 * @modifies
 * @abstract
 * @access
 * @alias
 * @async
 * @augments
 * @author
 * @borrows
 * @callback
 * @class
 * @classdesc
 * @constant
 * @constructs
 * @copyright
 * @default
 * @deprecated
 * @description
 * @enum
 * @event
 * @example
 * @exports
 * @external
 * @file
 * @fires
 * @function
 * @generator
 * @global
 * @hideconstructor
 * @ignore
 * @implements
 * @inheritdoc
 * @inheritDoc
 * @inner
 * @instance
 * @interface
 * @kind
 * @lends
 * @license
 * @listens
 * @member
 * @memberof
 * @memberof!
 * @mixes
 * @mixin
 * @module
 * @name
 * @namespace
 * @override
 * @package
 * @param
 * @private
 * @property
 * @protected
 * @public
 * @readonly
 * @requires
 * @returns
 * @see
 * @since
 * @static
 * @summary
 * @this
 * @throws
 * @todo
 * @tutorial
 * @type
 * @typedef
 * @variation
 * @version
 * @yields
 * @template
 */
function quux (foo) {}
// Message: Invalid JSDoc tag name "template".

/** 
 * @externs
 */
function quux (foo) {}
// Message: Invalid JSDoc tag name "externs".

/** @jsx h */
/** @jsxFrag Fragment */
/** @jsxImportSource preact */
/** @jsxRuntime automatic */
// Message: Invalid JSDoc tag name "jsx".

The following patterns are not considered problems:

/**
 * @param foo
 */
function quux (foo) {

}

/**
 * @memberof! foo
 */
function quux (foo) {

}

/**
 * @arg foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"param":"arg"}}}

/**
 * @parameter foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"structuredTags":{"parameter":{"name":"namepath-referencing","required":["type","name"],"type":true}}}}

/**
 * @bar foo
 */
function quux (foo) {

}
// "jsdoc/check-tag-names": ["error"|"warn", {"definedTags":["bar"]}]

/**
 * @baz @bar foo
 */
function quux (foo) {

}
// "jsdoc/check-tag-names": ["error"|"warn", {"definedTags":["baz","bar"]}]

/**
 * @baz @bar foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"param":"baz","returns":{"message":"Prefer `bar`","replacement":"bar"},"todo":false}}}

/**
 * @returns
 */
function quux (foo) {}

/**
 * @return
 */
function quux (foo) {}
// Settings: {"jsdoc":{"mode":"closure"}}

/** 
 * @modifies
 * @abstract
 * @access
 * @alias
 * @async
 * @augments
 * @author
 * @borrows
 * @callback
 * @class
 * @classdesc
 * @constant
 * @constructs
 * @copyright
 * @default
 * @deprecated
 * @description
 * @enum
 * @event
 * @example
 * @exports
 * @external
 * @file
 * @fires
 * @function
 * @generator
 * @global
 * @hideconstructor
 * @ignore
 * @implements
 * @inheritdoc
 * @inheritDoc
 * @inner
 * @instance
 * @interface
 * @kind
 * @lends
 * @license
 * @listens
 * @member
 * @memberof
 * @memberof!
 * @mixes
 * @mixin
 * @module
 * @name
 * @namespace
 * @override
 * @package
 * @param
 * @private
 * @property
 * @protected
 * @public
 * @readonly
 * @requires
 * @returns
 * @see
 * @since
 * @static
 * @summary
 * @this
 * @throws
 * @todo
 * @tutorial
 * @type
 * @typedef
 * @variation
 * @version
 * @yields
 */
function quux (foo) {}

/** 
 * @modifies
 * @abstract
 * @access
 * @alias
 * @async
 * @augments
 * @author
 * @borrows
 * @callback
 * @class
 * @classdesc
 * @constant
 * @constructs
 * @copyright
 * @default
 * @deprecated
 * @description
 * @enum
 * @event
 * @example
 * @exports
 * @external
 * @file
 * @fires
 * @function
 * @generator
 * @global
 * @hideconstructor
 * @ignore
 * @implements
 * @inheritdoc
 * @inheritDoc
 * @inner
 * @instance
 * @interface
 * @kind
 * @lends
 * @license
 * @listens
 * @member
 * @memberof
 * @memberof!
 * @mixes
 * @mixin
 * @module
 * @name
 * @namespace
 * @override
 * @package
 * @param
 * @private
 * @property
 * @protected
 * @public
 * @readonly
 * @requires
 * @returns
 * @see
 * @since
 * @static
 * @summary
 * @this
 * @throws
 * @todo
 * @tutorial
 * @type
 * @typedef
 * @variation
 * @version
 * @yields
 * @template
 */
function quux (foo) {}
// Settings: {"jsdoc":{"mode":"typescript"}}

/** 
 * @externs
 */
function quux (foo) {}
// Settings: {"jsdoc":{"mode":"closure"}}

/**
 *
 */
function quux (foo) {

}

/**
 * @todo
 */
function quux () {

}

/**
 * @extends Foo
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"augments":{"message":"@extends is to be used over @augments.","replacement":"extends"}}}}

/**
 * (Set tag name preference to itself to get aliases to
 *   work along with main tag name.)
 * @augments Bar
 * @extends Foo
 */
function quux () {
}
// Settings: {"jsdoc":{"tagNamePreference":{"extends":"extends"}}}

/**
 * Registers the `target` class as a transient dependency; each time the dependency is resolved a new instance will be created.
 *
 * @param target - The class / constructor function to register as transient.
 *
 * @example ```ts
@transient()
class Foo { }
```
 * @param Time for a new tag
 */
export function transient<T>(target?: T): T {
  // ...
}

/** @jsx h */
/** @jsxFrag Fragment */
/** @jsxImportSource preact */
/** @jsxRuntime automatic */
// "jsdoc/check-tag-names": ["error"|"warn", {"jsxTags":true}]

check-types

Reports invalid types.

By default, ensures that the casing of native types is the same as in this list:

undefined
null
boolean
number
bigint
string
symbol
object
Array
Function
Date
RegExp

Options

check-types allows one option:

• An option object:
  • with the key noDefaults to insist that only the supplied option type map is to be used, and that the default preferences (such as "string" over "String") will not be enforced. The option's default is false.
  • with the key exemptTagContexts which will avoid reporting when a bad type is found on a specified tag. Set to an array of objects with a key tag set to the tag to exempt, and a types key which can either be true to indicate that any types on that tag will be allowed, or to an array of strings which will only allow specific bad types. If an array of strings is given, these must match the type exactly, e.g., if you only allow "object", it will not allow "object<string, string>". Note that this is different from the behavior of settings.jsdoc.preferredTypes. This option is useful for normally restricting generic types like object with preferredTypes, but allowing typedef to indicate that its base type is object.
  • with the key unifyParentAndChildTypeChecks which will treat settings.jsdoc.preferredTypes keys such as SomeType as matching not only child types such as an unadorned SomeType but also SomeType<aChildType>, SomeType.<aChildType>, or if SomeType is Array (or []), it will match aChildType[]. If this is false or unset, the former format will only apply to types which are not parent types/unions whereas the latter formats will only apply for parent types/unions. The special types [], .<> (or .), and <> act only as parent types (and will not match a bare child type such as Array even when unified, though, as mentioned, Array will match say string[] or Array.<string> when unified). The special type * is only a child type. Note that there is no detection of parent and child type together, e.g., you cannot specify preferences for string[] specifically as distinct from say number[], but you can target both with [] or the child types number or string.

If a value is present both as a key and as a value, neither the key nor the value will be reported. Thus one can use this fact to allow both object and Object, for example. Note that in "typescript" mode, this is the default behavior.

See also the documentation on settings.jsdoc.preferredTypes which impacts the behavior of check-types.

Note that if there is an error parsing types for a tag, the function will silently ignore that tag, leaving it to the valid-types rule to report parsing errors.

Why not capital case everything?

Why are boolean, number and string exempt from starting with a capital letter? Let's take string as an example. In Javascript, everything is an object. The string Object has prototypes for string functions such as .toUpperCase().

Fortunately we don't have to write new String() everywhere in our code. Javascript will automatically wrap string primitives into string Objects when we're applying a string function to a string primitive. This way the memory footprint is a tiny little bit smaller, and the GC has less work to do.

So in a sense, there are two types of strings in Javascript:

1. {string} literals, also called primitives
2. {String} Objects.

We use the primitives because it's easier to write and uses less memory. {String} and {string} are technically both valid, but they are not the same.

new String('lard') // String {0: "l", 1: "a", 2: "r", 3: "d", length: 4}
'lard' // "lard"
new String('lard') === 'lard' // false

To make things more confusing, there are also object literals and object Objects. But object literals are still static Objects and object Objects are instantiated Objects. So an object primitive is still an object Object.

However, Object.create(null) objects are not instanceof Object, however, so in the case of this Object we lower-case to indicate possible support for these objects.

Basically, for primitives, we want to define the type as a primitive, because that's what we use in 99.9% of cases. For everything else, we use the type rather than the primitive. Otherwise it would all just be {object}.

In short: It's not about consistency, rather about the 99.9% use case. (And some functions might not even support the objects if they are checking for identity.)

type name	typeof	check-types	testcase
Array	object	Array	([]) instanceof Array -> true
Function	function	Function	(function f () {}) instanceof Function -> true
Date	object	Date	(new Date()) instanceof Date -> true
RegExp	object	RegExp	(new RegExp(/.+/)) instanceof RegExp -> true
Object	object	object	({}) instanceof Object -> true but Object.create(null) instanceof Object -> false
Boolean	boolean	boolean	(true) instanceof Boolean -> false
Number	number	number	(41) instanceof Number -> false
String	string	string	("test") instanceof String -> false

If you define your own tags and don't wish their bracketed portions checked for types, you can use settings.jsdoc.structuredTags with a tag type of false. If you set their type to an array, only those values will be permitted.

Context	everywhere
Tags	augments, class, constant, enum, implements, member, module, namespace, param, property, returns, throws, type, typedef, yields
Aliases	constructor, const, extends, var, arg, argument, prop, return, exception, yield
Closure-only	package, private, protected, public, static
Recommended	true
Options	noDefaults, exemptTagContexts, unifyParentAndChildTypeChecks
Settings	preferredTypes, mode, structuredTags

The following patterns are considered problems:

/**
 * @param {abc} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"abc":100}}}
// Message: Invalid `settings.jsdoc.preferredTypes`. Values must be falsy, a string, or an object.

/**
 * @param {Number} foo
 */
function quux (foo) {

}
// Message: Invalid JSDoc @param "foo" type "Number"; prefer: "number".

/**
 * @arg {Number} foo
 */
function quux (foo) {

}
// Message: Invalid JSDoc @arg "foo" type "Number"; prefer: "number".

/**
 * @returns {Number} foo
 * @throws {Number} foo
 */
function quux () {

}
// Message: Invalid JSDoc @returns type "Number"; prefer: "number".

/**
 * @param {(Number | string | Boolean)=} foo
 */
function quux (foo, bar, baz) {

}
// Message: Invalid JSDoc @param "foo" type "Number"; prefer: "number".

/**
 * @param {Array.<Number | String>} foo
 */
function quux (foo, bar, baz) {

}
// Message: Invalid JSDoc @param "foo" type "Number"; prefer: "number".

/**
 * @param {(Number | String)[]} foo
 */
function quux (foo, bar, baz) {

}
// Message: Invalid JSDoc @param "foo" type "Number"; prefer: "number".

/**
 * @param {abc} foo
 */
function qux(foo) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":"Abc","string":"Str"}}}
// Message: Invalid JSDoc @param "foo" type "abc"; prefer: "Abc".

/**
 * @param {abc} foo
 */
function qux(foo) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":{"replacement":"Abc"},"string":"Str"}}}
// Message: Invalid JSDoc @param "foo" type "abc"; prefer: "Abc".

/**
 * @param {abc} foo
 */
function qux(foo) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":{"message":"Messed up JSDoc @{{tagName}}{{tagValue}} type \"abc\"; prefer: \"Abc\".","replacement":"Abc"},"string":"Str"}}}
// Message: Messed up JSDoc @param "foo" type "abc"; prefer: "Abc".

/**
 * @param {abc} foo
 * @param {cde} bar
 * @param {object} baz
 */
function qux(foo, bar, baz) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":{"message":"Messed up JSDoc @{{tagName}}{{tagValue}} type \"abc\"; prefer: \"Abc\".","replacement":"Abc"},"cde":{"message":"More messed up JSDoc @{{tagName}}{{tagValue}} type \"cde\"; prefer: \"Cde\".","replacement":"Cde"},"object":"Object"}}}
// Message: Messed up JSDoc @param "foo" type "abc"; prefer: "Abc".

/**
 * @param {abc} foo
 */
function qux(foo) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":{"message":"Messed up JSDoc @{{tagName}}{{tagValue}} type \"abc\".","replacement":false},"string":"Str"}}}
// Message: Messed up JSDoc @param "foo" type "abc".

/**
 * @param {abc} foo
 */
function qux(foo) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":{"message":"Messed up JSDoc @{{tagName}}{{tagValue}} type \"abc\"."},"string":"Str"}}}
// Message: Messed up JSDoc @param "foo" type "abc".

/**
 * @param {abc} foo
 * @param {Number} bar
 */
function qux(foo, bar) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":"Abc","string":"Str"}}}
// "jsdoc/check-types": ["error"|"warn", {"noDefaults":true}]
// Message: Invalid JSDoc @param "foo" type "abc"; prefer: "Abc".

/**
 * @param {abc} foo
 * @param {Number} bar
 */
function qux(foo, bar) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":"Abc","string":"Str"}}}
// Message: Invalid JSDoc @param "foo" type "abc"; prefer: "Abc".

/**
 * @param {abc} foo
 */
function qux(foo) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":false,"string":"Str"}}}
// Message: Invalid JSDoc @param "foo" type "abc".

/**
 * @param {abc} foo
 */
function qux(foo) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":false}}}
// Message: Invalid JSDoc @param "foo" type "abc".

/**
 * @param {*} baz
 */
function qux(baz) {
}
// Settings: {"jsdoc":{"preferredTypes":{"*":false,"abc":"Abc","string":"Str"}}}
// Message: Invalid JSDoc @param "baz" type "*".

/**
 * @param {*} baz
 */
function qux(baz) {
}
// Settings: {"jsdoc":{"preferredTypes":{"*":"aaa","abc":"Abc","string":"Str"}}}
// Message: Invalid JSDoc @param "baz" type "*"; prefer: "aaa".

/**
 * @param {abc} foo
 * @param {Number} bar
 */
function qux(foo, bar) {
}
// Settings: {"jsdoc":{"preferredTypes":{"abc":"Abc","string":"Str"}}}
// Message: Invalid JSDoc @param "foo" type "abc"; prefer: "Abc".

/**
 * @param {Array} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array":"GenericArray"}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "GenericArray".

/**
 * @param {Array} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array":"GenericArray","Array.<>":"GenericArray"}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "GenericArray".

/**
 * @param {Array.<string>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array.<>":"GenericArray"}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "GenericArray".

/**
 * @param {Array<string>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array<>":"GenericArray"}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "GenericArray".

/**
 * @param {string[]} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"[]":"SpecialTypeArray"}}}
// Message: Invalid JSDoc @param "foo" type "[]"; prefer: "SpecialTypeArray".

/**
 * @param {string[]} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"[]":"SpecialTypeArray"}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]
// Message: Invalid JSDoc @param "foo" type "[]"; prefer: "SpecialTypeArray".

/**
 * @param {string[]} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array":"SpecialTypeArray"}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "SpecialTypeArray".

/**
 * @param {object} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject"}}}
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject","object.<>":"GenericObject"}}}
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject","object<>":"GenericObject"}}}
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object.<string>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object.<>":"GenericObject"}}}
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object<string>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object<>":"GenericObject"}}}
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object.<string, number>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object.<>":"GenericObject"}}}
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object<string, number>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object<>":"GenericObject"}}}
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object.<string>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject"}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object<string>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject"}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject"}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":false}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]
// Message: Invalid JSDoc @param "foo" type "object".

/**
 * @param {object} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":false}}}
// Message: Invalid JSDoc @param "foo" type "object".

/**
 * @param {object.<string, number>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject"}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 * @param {object<string, number>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject"}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "GenericObject".

/**
 *
 * @param {string[][]} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"[]":"Array."}}}
// Message: Invalid JSDoc @param "foo" type "[]"; prefer: "Array.".

/**
 *
 * @param {string[][]} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"[]":"Array.<>"}}}
// Message: Invalid JSDoc @param "foo" type "[]"; prefer: "Array.<>".

/**
 *
 * @param {string[][]} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"[]":"Array<>"}}}
// Message: Invalid JSDoc @param "foo" type "[]"; prefer: "Array<>".

/**
 *
 * @param {object.<string, object.<string, string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object.":"Object"}}}
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "Object".

/**
 *
 * @param {object.<string, object.<string, string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object.":"Object<>"}}}
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "Object<>".

/**
 *
 * @param {object<string, object<string, string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object<>":"Object."}}}
// Message: Invalid JSDoc @param "foo" type "object"; prefer: "Object.".

/**
 *
 * @param {Array.<Array.<string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array.":"[]"}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "[]".

/**
 *
 * @param {Array.<Array.<string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array.":"Array<>"}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "Array<>".

/**
 *
 * @param {Array.<Array.<string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array.":"<>"}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "<>".

/**
 *
 * @param {Array.<MyArray.<string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array.":"<>"}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "<>".

/**
 *
 * @param {Array.<MyArray.<string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"MyArray.":"<>"}}}
// Message: Invalid JSDoc @param "foo" type "MyArray"; prefer: "<>".

/**
 *
 * @param {Array<Array<string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"<>":"Array."}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "Array.".

/**
 *
 * @param {Array<Array<string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array":"Array."}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "Array.".

/**
 *
 * @param {Array<Array<string>>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"<>":"[]"}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "[]".

/** @typedef {String} foo */
// Message: Invalid JSDoc @typedef "foo" type "String"; prefer: "string".

/**
 * @this {array}
 */
function quux () {}
// Settings: {"jsdoc":{"mode":"closure"}}
// Message: Invalid JSDoc @this type "array"; prefer: "Array".

/**
 * @export {array}
 */
function quux () {}
// Settings: {"jsdoc":{"mode":"closure"}}
// Message: Invalid JSDoc @export type "array"; prefer: "Array".

/**
 * @typedef {object} foo
 * @property {object} bar
 */
// Settings: {"jsdoc":{"preferredTypes":{"object":"Object"}}}
// "jsdoc/check-types": ["error"|"warn", {"exemptTagContexts":[{"tag":"typedef","types":true}]}]
// Message: Invalid JSDoc @property "bar" type "object"; prefer: "Object".

/** @typedef {object} foo */
// Settings: {"jsdoc":{"preferredTypes":{"object":"Object"}}}
// "jsdoc/check-types": ["error"|"warn", {"exemptTagContexts":[{"tag":"typedef","types":["array"]}]}]
// Message: Invalid JSDoc @typedef "foo" type "object"; prefer: "Object".

/**
 * @typedef {object} foo
 * @property {object} bar
 */
// Settings: {"jsdoc":{"preferredTypes":{"object":"Object"}}}
// "jsdoc/check-types": ["error"|"warn", {"exemptTagContexts":[{"tag":"typedef","types":["object"]}]}]
// Message: Invalid JSDoc @property "bar" type "object"; prefer: "Object".

/** @typedef {object<string, string>} foo */
// Settings: {"jsdoc":{"preferredTypes":{"object<>":"Object<>"}}}
// "jsdoc/check-types": ["error"|"warn", {"exemptTagContexts":[{"tag":"typedef","types":["object"]}]}]
// Message: Invalid JSDoc @typedef "foo" type "object"; prefer: "Object<>".

/**
 * @param {Array<number | undefined>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array.<>":"[]","Array<>":"[]"}}}
// Message: Invalid JSDoc @param "foo" type "Array"; prefer: "[]".

/**
 * @typedef {object} foo
 */
function a () {}

/**
 * @typedef {Object} foo
 */
function b () {}
// Settings: {"jsdoc":{"mode":"typescript","preferredTypes":{"object":"Object"}}}
// Message: Invalid JSDoc @typedef "foo" type "object"; prefer: "Object".

/**
 * @aCustomTag {Number} foo
 */
// Settings: {"jsdoc":{"structuredTags":{"aCustomTag":{"type":true}}}}
// Message: Invalid JSDoc @aCustomTag "foo" type "Number"; prefer: "number".

/**
 * @aCustomTag {Number} foo
 */
// Settings: {"jsdoc":{"structuredTags":{"aCustomTag":{"type":["otherType","anotherType"]}}}}
// Message: Invalid JSDoc @aCustomTag "foo" type "Number"; prefer: ["otherType","anotherType"].

The following patterns are not considered problems:

/**
 * @param {number} foo
 * @param {Bar} bar
 * @param {*} baz
 */
function quux (foo, bar, baz) {

}

/**
 * @arg {number} foo
 * @arg {Bar} bar
 * @arg {*} baz
 */
function quux (foo, bar, baz) {

}

/**
 * @param {(number | string | boolean)=} foo
 */
function quux (foo, bar, baz) {

}

/**
 * @param {typeof bar} foo
 */
function qux(foo) {
}

/**
 * @param {import('./foo').bar.baz} foo
 */
function qux(foo) {
}

/**
 * @param {(x: number, y: string) => string} foo
 */
function qux(foo) {
}

/**
 * @param {() => string} foo
 */
function qux(foo) {
}

/**
 * @returns {Number} foo
 * @throws {Number} foo
 */
function quux () {

}
// "jsdoc/check-types": ["error"|"warn", {"noDefaults":true}]

/**
 * @param {Object} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"Object"}}}

/**
 * @param {Array} foo
 */
function quux (foo) {

}

/**
 * @param {Array.<string>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array":"GenericArray"}}}

/**
 * @param {Array<string>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array":"GenericArray"}}}

/**
 * @param {string[]} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array":"SpecialTypeArray","Array.<>":"SpecialTypeArray","Array<>":"SpecialTypeArray"}}}

/**
 * @param {string[]} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array.<>":"SpecialTypeArray","Array<>":"SpecialTypeArray"}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]

/**
 * @param {Array} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"[]":"SpecialTypeArray"}}}

/**
 * @param {Array} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"[]":"SpecialTypeArray"}}}
// "jsdoc/check-types": ["error"|"warn", {"unifyParentAndChildTypeChecks":true}]

/**
 * @param {Array} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array.<>":"GenericArray"}}}

/**
 * @param {Array} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"Array<>":"GenericArray"}}}

/**
 * @param {object} foo
 */
function quux (foo) {

}

/**
 * @param {object.<string>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject"}}}

/**
 * @param {object<string>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject"}}}

/**
 * @param {object.<string, number>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject"}}}

/**
 * @param {object<string, number>} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object":"GenericObject"}}}

/**
 * @param {object} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object.<>":"GenericObject"}}}

/**
 * @param {object} foo
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"preferredTypes":{"object<>":"GenericObject"}}}

/**
 * @param {Number<} Ignore the error as not a validating rule
 */
function quux (foo) {

}

/** @param {function(...)} callback The function to invoke. */
var subscribe = function(callback) {};

/**
 * @this {Array}
 */
function quux () {}
// Settings: {"jsdoc":{"mode":"closure"}}

/**
 * @export {Array}
 */
function quux () {}
// Settings: {"jsdoc":{"mode":"closure"}}

/** @type {new() => EntityBase} */

/** @typedef {object} foo */
// Settings: {"jsdoc":{"preferredTypes":{"object":"Object"}}}
// "jsdoc/check-types": ["error"|"warn", {"exemptTagContexts":[{"tag":"typedef","types":true}]}]

/** @typedef {object<string, string>} foo */
// Settings: {"jsdoc":{"preferredTypes":{"object":"Object"}}}

/** @typedef {object<string, string>} foo */
// Settings: {"jsdoc":{"preferredTypes":{"object<>":"Object<>"}}}
// "jsdoc/check-types": ["error"|"warn", {"exemptTagContexts":[{"tag":"typedef","types":["object<string, string>"]}]}]

/**
 * @typedef {object} foo
 */

 /**
  * @typedef {Object} foo
  */
// Settings: {"jsdoc":{"preferredTypes":{"object":"Object","Object":"object"}}}

/**
 * @typedef {object} foo
 */
function a () {}

/**
 * @typedef {Object} foo
 */
function b () {}
// Settings: {"jsdoc":{"preferredTypes":{"object":"Object","Object":"object"}}}

/**
 * @typedef {object} foo
 */
function a () {}

/**
 * @typedef {Object} foo
 */
function b () {}
// Settings: {"jsdoc":{"mode":"typescript"}}

/**
 * @aCustomTag {Number} foo
 */
// Settings: {"jsdoc":{"structuredTags":{"aCustomTag":{"type":false}}}}

/**
 * @aCustomTag {otherType} foo
 */
// Settings: {"jsdoc":{"structuredTags":{"aCustomTag":{"type":["otherType","anotherType"]}}}}

/**
 * @aCustomTag {anotherType|otherType} foo
 */
// Settings: {"jsdoc":{"structuredTags":{"aCustomTag":{"type":["otherType","anotherType"]}}}}

/**
 * Bad types handled by `valid-types` instead.
 * @param {str(} foo
 */
function quux (foo) {

}

check-values

This rule checks the values for a handful of tags:

1. @version - Checks that there is a present and valid semver version value.
2. @since - As with @version
3. @license - Checks that there is a present and valid SPDX identifier or is present within an allowedLicenses option.
4. @author - Checks that there is a value present, and if the option allowedAuthors is present, ensure that the author value is one of these array items.
5. @variation - If numericOnlyVariation is set, will checks that there is a value present, and that it is an integer (otherwise, jsdoc allows any value).

Options

allowedAuthors

An array of allowable author values. If absent, only non-whitespace will be checked for.

allowedLicenses

An array of allowable license values or true to allow any license text. If present as an array, will be used in place of SPDX identifiers.

licensePattern

A string to be converted into a RegExp (with u flag) and whose first parenthetical grouping, if present, will match the portion of the license description to check (if no grouping is present, then the whole portion matched will be used). Defaults to /([^\n\r]*)/gu, i.e., the SPDX expression is expected before any line breaks.

Note that the / delimiters are optional, but necessary to add flags.

Defaults to using the u flag, so to add your own flags, encapsulate your expression as a string, but like a literal, e.g., /^mit$/ui.

numericOnlyVariation

Whether to enable validation that @variation must be a number. Defaults to false.

Context	everywhere
Tags	@version, @since, @license, @author, @variation
Recommended	true
Options	allowedAuthors, allowedLicenses, licensePattern
Settings	tagNamePreference

The following patterns are considered problems:

/**
 * @version
 */
function quux (foo) {

}
// Message: Missing JSDoc @version value.

/**
 * @version 3.1
 */
function quux (foo) {

}
// Message: Invalid JSDoc @version: "3.1".

/**
 * @variation -3
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"numericOnlyVariation":true}]
// Message: Invalid JSDoc @variation: "-3".

/**
 * @since
 */
function quux (foo) {

}
// Message: Missing JSDoc @since value.

/**
 * @since 3.1
 */
function quux (foo) {

}
// Message: Invalid JSDoc @since: "3.1".

/**
 * @license
 */
function quux (foo) {

}
// Message: Missing JSDoc @license value.

/**
 * @license FOO
 */
function quux (foo) {

}
// Message: Invalid JSDoc @license: "FOO"; expected SPDX expression: https://spdx.org/licenses/.

/**
 * @license FOO
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"allowedLicenses":["BAR","BAX"]}]
// Message: Invalid JSDoc @license: "FOO"; expected one of BAR, BAX.

/**
 * @license MIT-7
 * Some extra text...
 */
function quux (foo) {

}
// Message: Invalid JSDoc @license: "MIT-7"; expected SPDX expression: https://spdx.org/licenses/.

/**
 * @license (MIT OR GPL-2.5)
 */
function quux (foo) {

}
// Message: Invalid JSDoc @license: "(MIT OR GPL-2.5)"; expected SPDX expression: https://spdx.org/licenses/.

/**
 * @license MIT
 * Some extra text
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"licensePattern":"[\\s\\S]*"}]
// Message: Invalid JSDoc @license: "MIT
Some extra text"; expected SPDX expression: https://spdx.org/licenses/.

/**
 * @author
 */
function quux (foo) {

}
// Message: Missing JSDoc @author value.

/**
 * @author Brett Zamir
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"allowedAuthors":["Gajus Kuizinas","golopot"]}]
// Message: Invalid JSDoc @author: "Brett Zamir"; expected one of Gajus Kuizinas, golopot.

/**
 * @variation
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"numericOnlyVariation":true}]
// Message: Missing JSDoc @variation value.

/**
 * @variation 5.2
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"numericOnlyVariation":true}]
// Message: Invalid JSDoc @variation: "5.2".

The following patterns are not considered problems:

/**
 * @version 3.4.1
 */
function quux (foo) {

}

/**
 * @version      3.4.1
 */
function quux (foo) {

}

/**
 * @since 3.4.1
 */
function quux (foo) {

}

/**
 * @since      3.4.1
 */
function quux (foo) {

}

/**
 * @license MIT
 */
function quux (foo) {

}

/**
 * @license MIT
 * Some extra text...
 */
function quux (foo) {

}

/**
 * @license (MIT OR GPL-2.0)
 */
function quux (foo) {

}

/**
 * @license FOO
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"allowedLicenses":["FOO","BAR","BAX"]}]

/**
 * @license FOO
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"allowedLicenses":true}]

/**
 * @license MIT
 * Some extra text
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"licensePattern":"[^\n]*"}]

/**
 * @author Gajus Kuizinas
 */
function quux (foo) {

}

/**
 * @author Brett Zamir
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"allowedAuthors":["Gajus Kuizinas","golopot","Brett Zamir"]}]

/**
 * @variation 3
 */
function quux (foo) {

}
// "jsdoc/check-values": ["error"|"warn", {"numericOnlyVariation":true}]

/**
 * @variation abc
 */
function quux (foo) {

}

/**
 * @module test
 * @license MIT
 */
'use strict';

empty-tags

Expects the following tags to be empty of any content:

• @abstract
• @async
• @generator
• @global
• @hideconstructor
• @ignore
• @inheritdoc
• @inner
• @instance
• @internal (used by TypeScript)
• @override
• @readonly

The following will also be expected to be empty unless settings.jsdoc.mode is set to "closure" (which allows types).

• @package
• @private
• @protected
• @public
• @static

Note that @private will still be checked for content by this rule even with settings.jsdoc.ignorePrivate set to true (a setting which normally causes rules not to take effect).

Similarly, @internal will still be checked for content by this rule even with settings.jsdoc.ignoreInternal set to true.

Options

tags

If you want additional tags to be checked for their descriptions, you may add them within this option.

{
  'jsdoc/empty-tags': ['error', {tags: ['event']}]
}

Context	everywhere
Tags	abstract, async, generator, global, hideconstructor, ignore, inheritdoc, inner, instance, internal, override, readonly, package, private, protected, public, static and others added by tags
Recommended	true
Options	tags
The following patterns are considered problems:

/**
 * @abstract extra text
 */
function quux () {

}
// Message: @abstract should be empty.

class Test {
    /**
     * @abstract extra text
     */
    quux () {

    }
}
// Message: @abstract should be empty.

/**
 * @abstract extra text
 * @inheritdoc
 * @async out of place
 */
function quux () {

}
// Message: @abstract should be empty.

/**
 * @event anEvent
 */
function quux () {

}
// "jsdoc/empty-tags": ["error"|"warn", {"tags":["event"]}]
// Message: @event should be empty.

/**
 * @private {someType}
 */
function quux () {

}
// Message: @private should be empty.

/**
 * @internal {someType}
 */
function quux () {

}
// Message: @internal should be empty.

/**
 * @private {someType}
 */
function quux () {

}
// Settings: {"jsdoc":{"ignorePrivate":true}}
// Message: @private should be empty.

The following patterns are not considered problems:

/**
 * @abstract
 */
function quux () {

}

/**
 *
 */
function quux () {

}

/**
 * @param aName
 */
function quux () {

}

/**
 * @abstract
 * @inheritdoc
 * @async
 */
function quux () {

}

/**
 * @private {someType}
 */
function quux () {

}
// Settings: {"jsdoc":{"mode":"closure"}}

/**
 * @private
 */
function quux () {

}

/**
 * @internal
 */
function quux () {

}

/**
 * Create an array.
 *
 * @private
 *
 * @param {string[]} [elem] - Elements to make an array of.
 * @param {boolean} [clone] - Optionally clone nodes.
 * @returns {string[]} The array of nodes.
 */
function quux () {}

implements-on-classes

Reports an issue with any non-constructor function using @implements.

Constructor functions, whether marked with @class, @constructs, or being an ES6 class constructor, will not be flagged.

To indicate that a function follows another function's signature, one might instead use @type to indicate the @function or @callback to which the function is adhering.

Options

contexts

Set this to an array of strings representing the AST context (or an object with context and comment properties) where you wish the rule to be applied.

Overrides the default contexts (see below). Set to "any" if you want the rule to apply to any jsdoc block throughout your files (as is necessary for finding function blocks not attached to a function declaration or expression, i.e., @callback or @function (or its aliases @func or @method) (including those associated with an @interface).

See the "AST and Selectors" section of our README for more on the expected format.

Context	ArrowFunctionExpression, FunctionDeclaration, FunctionExpression; others when contexts option enabled
Tags	implements (prevented)
Recommended	true
Options	contexts

The following patterns are considered problems:

/**
 * @implements {SomeClass}
 */
function quux () {

}
// Message: @implements used on a non-constructor function

/**
 * @implements {SomeClass}
 */
function quux () {

}
// "jsdoc/implements-on-classes": ["error"|"warn", {"contexts":["any"]}]
// Message: @implements used on a non-constructor function

/**
 * @function
 * @implements {SomeClass}
 */
function quux () {

}
// "jsdoc/implements-on-classes": ["error"|"warn", {"contexts":["any"]}]
// Message: @implements used on a non-constructor function

/**
 * @callback
 * @implements {SomeClass}
 */
// "jsdoc/implements-on-classes": ["error"|"warn", {"contexts":["any"]}]
// Message: @implements used on a non-constructor function

/**
 * @implements {SomeClass}
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"implements":false}}}
// Message: Unexpected tag `@implements`

class Foo {
    /**
     * @implements {SomeClass}
     */
    constructor() {}

    /**
     * @implements {SomeClass}
     */
    bar() {}
}
// "jsdoc/implements-on-classes": ["error"|"warn", {"contexts":["MethodDefinition"]}]
// Message: @implements used on a non-constructor function

class Foo {
    /**
     * @implements {SomeClass}
     */
    constructor() {}

    /**
     * @implements {SomeClass}
     */
    bar() {}
}
// "jsdoc/implements-on-classes": ["error"|"warn", {"contexts":["any"]}]
// Message: @implements used on a non-constructor function

The following patterns are not considered problems:

/**
 * @implements {SomeClass}
 * @class
 */
function quux () {

}

/**
 * @implements {SomeClass}
 * @class
 */
function quux () {

}
// "jsdoc/implements-on-classes": ["error"|"warn", {"contexts":["any"]}]

/**
 * @implements {SomeClass}
 */
// "jsdoc/implements-on-classes": ["error"|"warn", {"contexts":["any"]}]

/**
 * @implements {SomeClass}
 * @constructor
 */
function quux () {

}

/**
 *
 */
class quux {
  /**
   * @implements {SomeClass}
   */
  constructor () {

  }
}

/**
 *
 */
const quux = class {
  /**
   * @implements {SomeClass}
   */
  constructor () {

  }
}

/**
 *
 */
function quux () {

}

/**
 *
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"implements":false}}}

/**
 * @function
 * @implements {SomeClass}
 */

/**
 * @callback
 * @implements {SomeClass}
 */

match-description

Enforces a regular expression pattern on descriptions.

The default is this basic expression to match English sentences (Support for Unicode upper case may be added in a future version when it can be handled by our supported Node versions):

^([A-Z]|[`\\d_])[\\s\\S]*[.?!`]$

Applies to the jsdoc block description and @description (or @desc) by default but the tags option (see below) may be used to match other tags.

The default (and all regex options) defaults to using (only) the u flag, so to add your own flags, encapsulate your expression as a string, but like a literal, e.g., /[A-Z].*\\./ui.

Note that / delimiters are optional, but necessary to add flags (besides u).

Also note that the default or optional regular expressions is not case-insensitive unless one opts in to add the i flag.

You can add the s flag if you want . to match newlines. Note, however, that the trailing newlines of a description will not be matched.

Options

matchDescription

You can supply your own expression to override the default, passing a matchDescription string on the options object.

{
  'jsdoc/match-description': ['error', {matchDescription: '[A-Z].*\\.'}]
}

message

You may provide a custom default message by using the following format:

{
  'jsdoc/match-description': ['error', {
    message: 'The default dscription should begin with a capital letter.'
  }]
}

This can be overridden per tag or for the main block description by setting message within tags or mainDescription, respectively.

tags

If you want different regular expressions to apply to tags, you may use the tags option object:

{
  'jsdoc/match-description': ['error', {tags: {
    param: '\\- [A-Z].*\\.',
    returns: '[A-Z].*\\.'
  }}]
}

In place of a string, you can also add true to indicate that a particular tag should be linted with the matchDescription value (or the default).

{
  'jsdoc/match-description': ['error', {tags: {
    param: true,
    returns: true
  }}]
}

Alternatively, you may supply an object with a message property to indicate the error message for that tag.

{
  'jsdoc/match-description': ['error', {tags: {
    param: {message: 'Begin with a hyphen', match: '\\- [A-Z].*\\.'},
    returns: {message: 'Capitalize for returns (the default)', match: true}
  }}]
}

The tags @param/@arg/@argument and @property/@prop will be properly parsed to ensure that the matched "description" text includes only the text after the name.

All other tags will treat the text following the tag name, a space, and an optional curly-bracketed type expression (and another space) as part of its "description" (e.g., for @returns {someType} some description, the description is some description while for @some-tag xyz, the description is xyz).

mainDescription

If you wish to override the main block description without changing the default match-description (which can cascade to the tags with true), you may use mainDescription:

{
  'jsdoc/match-description': ['error', {
    mainDescription: '[A-Z].*\\.',
    tags: {
      param: true,
      returns: true
    }
  }]
}

There is no need to add mainDescription: true, as by default, the main block description (and only the main block description) is linted, though you may disable checking it by setting it to false.

You may also provide an object with message:

{
  'jsdoc/match-description': ['error', {
    mainDescription: {
      message: 'Capitalize first word of JSDoc block descriptions',
      match: '[A-Z].*\\.'
    },
    tags: {
      param: true,
      returns: true
    }
  }]
}

contexts

Set this to an array of strings representing the AST context (or an object with context and comment properties) where you wish the rule to be applied. (e.g., ClassDeclaration for ES6 classes). Overrides the default contexts (see below). Set to "any" if you want the rule to apply to any jsdoc block throughout your files.

See the "AST and Selectors" section of our README for more on the expected format.

Context	ArrowFunctionExpression, FunctionDeclaration, FunctionExpression; others when contexts option enabled
Tags	docblock and @description by default but more with tags
Aliases	@desc
Recommended	false
Settings
Options	contexts, tags (accepts tags with names and optional type such as 'param', 'arg', 'argument', 'property', and 'prop', and accepts arbitrary list of other tags with an optional type (but without names), e.g., 'returns', 'return'), mainDescription, matchDescription

The following patterns are considered problems:

/**
 * foo.
 */
const q = class {

}
// "jsdoc/match-description": ["error"|"warn", {"contexts":["ClassExpression"]}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * foo.
 */
const q = class {

}
// "jsdoc/match-description": ["error"|"warn", {"contexts":["ClassExpression"],"message":"Needs to begin with a capital letter and end with an end mark."}]
// Message: Needs to begin with a capital letter and end with an end mark.

/**
 * foo.
 */
// "jsdoc/match-description": ["error"|"warn", {"contexts":["any"]}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * foo.
 */
// "jsdoc/match-description": ["error"|"warn", {"contexts":["any"]}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * foo.
 */
const q = {

};
// "jsdoc/match-description": ["error"|"warn", {"contexts":["ObjectExpression"]}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * foo.
 */
function quux () {

}
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo)
 */
function quux () {

}
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * тест.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"matchDescription":"[А-Я][А-я]+\\."}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * тест.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"matchDescription":"[А-Я][А-я]+\\.","message":"Needs to begin with a capital letter and end with an end mark."}]
// Message: Needs to begin with a capital letter and end with an end mark.

/**
 * Abc.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"mainDescription":"[А-Я][А-я]+\\.","tags":{"param":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Abc.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"mainDescription":{"match":"[А-Я][А-я]+\\.","message":"Needs to begin with a Cyrillic capital letter and end with a period."},"tags":{"param":true}}]
// Message: Needs to begin with a Cyrillic capital letter and end with a period.

/**
 * Foo
 */
function quux () {

}
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo.
 *
 * @param foo foo.
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"param":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo.
 *
 * @template Abc, Def foo.
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"template":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo.
 *
 * @prop foo foo.
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"prop":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo.
 *
 * @summary foo.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"summary":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo.
 *
 * @author
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"author":".+"}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo.
 *
 * @x-tag
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"x-tag":".+"}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo.
 *
 * @description foo foo.
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"description":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo
 *
 * @param foo foo.
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"mainDescription":"^[a-zA-Z]*$","tags":{"param":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo
 *
 * @param foo foo.
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"mainDescription":{"match":"^[a-zA-Z]*$","message":"Letters only"},"tags":{"param":{"match":true,"message":"Needs to begin with a capital letter and end with a period."}}}]
// Message: Needs to begin with a capital letter and end with a period.

/**
 * Foo
 *
 * @param foo foo.
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"mainDescription":false,"tags":{"param":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo.
 *
 * @param foo bar
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"param":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * {@see Foo.bar} buz
 */
function quux (foo) {

}
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo.
 *
 * @returns {number} foo
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"returns":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo.
 *
 * @returns foo.
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"returns":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * lorem ipsum dolor sit amet, consectetur adipiscing elit. pellentesque elit diam,
 * iaculis eu dignissim sed, ultrices sed nisi. nulla at ligula auctor, consectetur neque sed,
 * tincidunt nibh. vivamus sit amet vulputate ligula. vivamus interdum elementum nisl,
 * vitae rutrum tortor semper ut. morbi porta ante vitae dictum fermentum.
 * proin ut nulla at quam convallis gravida in id elit. sed dolor mauris, blandit quis ante at,
 * consequat auctor magna. duis pharetra purus in porttitor mollis.
 */
function longDescription (foo) {

}
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * @arg {number} foo - Foo
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"arg":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * @argument {number} foo - Foo
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"argument":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * @return {number} foo
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"return":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Returns bar.
 *
 * @return {number} bar
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"return":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * @param notRet
 * @returns Тест.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"param":"[А-Я][А-я]+\\."}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * @description notRet
 * @returns Тест.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"description":"[А-Я][А-я]+\\."}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * foo.
 */
class quux {

}
// "jsdoc/match-description": ["error"|"warn", {"contexts":["ClassDeclaration"]}]
// Message: JSDoc description does not satisfy the regex pattern.

class MyClass {
  /**
   * Abc
   */
  myClassField = 1
}
// "jsdoc/match-description": ["error"|"warn", {"contexts":["PropertyDefinition"]}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * foo.
 */
interface quux {

}
// "jsdoc/match-description": ["error"|"warn", {"contexts":["TSInterfaceDeclaration"]}]
// Message: JSDoc description does not satisfy the regex pattern.

const myObject = {
  /**
   * Bad description
   */
  myProp: true
};
// "jsdoc/match-description": ["error"|"warn", {"contexts":["Property"]}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * @param foo Foo bar
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"description":false}}}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"param":true}}]
// Message: JSDoc description does not satisfy the regex pattern.

/**
 * Foo bar
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"description":false}}}
// Message: JSDoc description does not satisfy the regex pattern.

The following patterns are not considered problems:

/**
 *
 */

/**
 *
 */
 function quux () {

 }

/**
 * @param foo - Foo.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"param":true}}]

/**
 * Foo.
 */
function quux () {

}

/**
 * Foo.
 * Bar.
 */
function quux () {

}

/**
 * Foo.
 *
 * Bar.
 */
function quux () {

}

/**
 * Foo.
 *
 * Bar.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"message":"This won't be shown"}]

/**
 * Тест.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"matchDescription":"[А-Я][А-я]+\\."}]

/**
 * @param notRet
 * @returns Тест.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"returns":"[А-Я][А-я]+\\."}}]

/**
 * @param notRet
 * @description Тест.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"description":"[А-Я][А-я]+\\."}}]

/**
 * Foo
 * bar.
 */
function quux () {

}

/**
 * @returns Foo bar.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"returns":true}}]

/**
 * @returns {type1} Foo bar.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"returns":true}}]

/**
 * @description Foo bar.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"description":true}}]

/**
 * @description Foo
 * bar.
 * @param
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"description":true}}]

/** @description Foo bar. */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"description":true}}]

/**
 * @description Foo
 * bar.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"description":true}}]

/**
 * Foo. {@see Math.sin}.
 */
function quux () {

}

/**
 * Foo {@see Math.sin} bar.
 */
function quux () {

}

/**
 * Foo?
 *
 * Bar!
 *
 * Baz:
 *   1. Foo.
 *   2. Bar.
 */
function quux () {

}

/**
 * Hello:
 * World.
 */
function quux () {

}

/**
 * Hello: world.
 */
function quux () {

}

/**
 * Foo
 * Bar.
 */
function quux () {

}

/**
 * Foo.
 *
 * foo.
 */
function quux () {

}

/**
 * foo.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"mainDescription":false}]

/**
 * foo.
 */
class quux {

}

/**
 * foo.
 */
class quux {

}
// "jsdoc/match-description": ["error"|"warn", {"mainDescription":true}]

class MyClass {
  /**
   * Abc.
   */
  myClassField = 1
}
// "jsdoc/match-description": ["error"|"warn", {"contexts":["PropertyDefinition"]}]

/**
 * Foo.
 */
interface quux {

}
// "jsdoc/match-description": ["error"|"warn", {"contexts":["TSInterfaceDeclaration"]}]

const myObject = {
  /**
   * Bad description
   */
  myProp: true
};
// "jsdoc/match-description": ["error"|"warn", {"contexts":[]}]

/**
 * foo.
 */
const q = class {

}
// "jsdoc/match-description": ["error"|"warn", {"contexts":[]}]

/**
 * foo.
 */
const q = {

};
// "jsdoc/match-description": ["error"|"warn", {"contexts":[]}]

/**
 * @description foo.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"param":true}}]

/**
 * Foo.
 *
 * @summary Foo.
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"summary":true}}]

/**
 * Foo.
 *
 * @author Somebody
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"author":".+"}}]

/**
 * Foo.
 *
 * @x-tag something
 */
function quux () {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"x-tag":".+"}}]

/**
 * Foo.
 *
 * @prop foo Foo.
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"prop":true}}]

/**
 * @param foo Foo bar.
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"description":false}}}

/**
 *
 */
function quux () {

}
// Settings: {"jsdoc":{"tagNamePreference":{"description":false}}}

/**
 * Foo.
 *
 * @template Abc, Def Foo.
 */
function quux (foo) {

}
// "jsdoc/match-description": ["error"|"warn", {"tags":{"template":true}}]

/**
 * Enable or disable plugin.
 *
 * When enabling with this function, the script will be attached to the `document` if:.
 * - the script runs in browser context.
 * - the `document` doesn't have the script already attached.
 * - the `loadScript` option is set to `true`.
 * @param enabled `true` to enable, `false` to disable. Default: `true`.
 */
// "jsdoc/match-description": ["error"|"warn", {"contexts":["any"],"mainDescription":"/^[A-Z`-].*\\.$/us","matchDescription":"^([A-Z`-].*(\\.|:)|-\\s.*)$","tags":{"param":true,"returns":true}}]

match-name

Reports the name portion of a JSDoc tag if matching or not matching a given regular expression.

Note that some tags do not possess names and anything appearing to be a name will actually be part of the description (e.g., for @returns {type} notAName). If you are defining your own tags, see the structuredTags setting (if name: false, this rule will not apply to that tag).

Options

A single options object with the following properties:

match

match is a required option containing an array of objects which determine the conditions whereby a name is reported as being problematic.

These objects can have any combination of the following groups of optional properties, all of which act to confine one another:

• tags - This array should include tag names or * to indicate the match will apply for all tags (except as confined by any context properties). If * is not used, then these rules will only apply to the specified tags. If tags is omitted, then * is assumed.

• allowName - Indicates which names are allowed for the given tag (or *). Accepts a string regular expression (optionally wrapped between two / delimiters followed by optional flags) used to match the name.

• disallowName - As with allowName but indicates names that are not allowed.

• replacement - If disallowName is supplied and this value is present, it will replace the matched disallowName text.

• context - AST to confine the allowing or disallowing to jsdoc blocks associated with a particular context. See the "AST and Selectors" section of our README for more on the expected format.

• comment - As with context but AST for the JSDoc block comment and types

• message - An optional custom message to use when there is a match.

Note that comment, even if targeting a specific tag, is used to match the whole block. So if a comment finds its specific tag, it may still apply fixes found by the likes of disallowName even when a different tag has the disallowed name. An alternative is to ensure that comment finds the specific tag of the desired tag and/or name and no disallowName (or allowName) is supplied. In such a case, only one error will be reported, but no fixer will be applied, however.

Context	everywhere
Tags	(The tags specified by tags, including any tag if * is set)
Recommended	false
Settings	structuredTags
Options	match

The following patterns are considered problems:

/**
 * @param opt_a
 * @param opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"disallowName":"/^opt_/i"}]}]
// Message: Only allowing names not matching `/^opt_/i` but found "opt_a".

/**
 * @param opt_a
 * @param opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"disallowName":"/^opt_/i","replacement":""}]}]
// Message: Only allowing names not matching `/^opt_/i` but found "opt_a".

/**
 * @param a
 * @param opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"allowName":"/^[a-z]+$/i"}]}]
// Message: Only allowing names matching `/^[a-z]+$/i` but found "opt_b".

/**
 * @param arg
 * @param opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"allowName":"/^[a-z]+$/i","disallowName":"/^arg/i"}]}]
// Message: Only allowing names not matching `/^arg/i` but found "arg".

/**
 * @param opt_a
 * @param arg
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"disallowName":"/^arg$/i"},{"disallowName":"/^opt_/i"}]}]
// Message: Only allowing names not matching `/^opt_/i` but found "opt_a".

/**
 * @property opt_a
 * @param opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"disallowName":"/^opt_/i","tags":["param"]}]}]
// Message: Only allowing names not matching `/^opt_/i` but found "opt_b".

/**
 * @someTag opt_a
 * @param opt_b
 */
// Settings: {"jsdoc":{"structuredTags":{"someTag":{"name":"namepath-defining"}}}}
// "jsdoc/match-name": ["error"|"warn", {"match":[{"disallowName":"/^opt_/i","tags":["param"]}]}]
// Message: Only allowing names not matching `/^opt_/i` but found "opt_b".

/**
 * @property opt_a
 * @param opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"disallowName":"/^opt_/i","tags":["*"]}]}]
// Message: Only allowing names not matching `/^opt_/i` but found "opt_a".

/**
 * @param opt_a
 * @param opt_b
 */
function quux () {
}
// "jsdoc/match-name": ["error"|"warn", {"match":[{"context":"FunctionDeclaration","disallowName":"/^opt_/i"}]}]
// Message: Only allowing names not matching `/^opt_/i` but found "opt_a".

/**
 * @property opt_a
 * @param {Bar|Foo} opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"comment":"JSDocBlock:has(JSDocTag[tag=\"param\"][name=/opt_/] > JSDocTypeUnion:has(JsdocTypeName[value=\"Bar\"]:nth-child(1)))"}]}]
// Message: Prohibited context for "opt_a".

/**
 * @property opt_a
 * @param {Bar|Foo} opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"comment":"JSDocBlock:has(JSDocTag[tag=\"param\"][name=/opt_/] > JSDocTypeUnion:has(JsdocTypeName[value=\"Bar\"]:nth-child(1)))","message":"Don't use `opt_` prefixes with Bar|..."}]}]
// Message: Don't use `opt_` prefixes with Bar|...

/**
 * @param opt_a
 * @param opt_b
 */
function quux () {}
// "jsdoc/match-name": ["error"|"warn", ]
// Message: Rule `no-restricted-syntax` is missing a `match` option.

The following patterns are not considered problems:

/**
 * @param opt_a
 * @param opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"disallowName":"/^arg/i"}]}]

/**
 * @param a
 * @param opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"allowName":"/^[a-z_]+$/i"}]}]

/**
 * @param someArg
 * @param anotherArg
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"allowName":"/^[a-z]+$/i","disallowName":"/^arg/i"}]}]

/**
 * @param elem1
 * @param elem2
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"disallowName":"/^arg$/i"},{"disallowName":"/^opt_/i"}]}]

/**
 * @someTag opt_a
 * @param opt_b
 */
// Settings: {"jsdoc":{"structuredTags":{"someTag":{"name":"namepath-defining"}}}}
// "jsdoc/match-name": ["error"|"warn", {"match":[{"disallowName":"/^opt_/i","tags":["property"]}]}]

/**
 * @property opt_a
 * @param opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"disallowName":"/^arg/i","tags":["*"]}]}]

/**
 * @param opt_a
 * @param opt_b
 */
class A {
}
// "jsdoc/match-name": ["error"|"warn", {"match":[{"context":"FunctionDeclaration","disallowName":"/^opt_/i"}]}]

/**
 * @property opt_a
 * @param {Foo|Bar} opt_b
 */
// "jsdoc/match-name": ["error"|"warn", {"match":[{"comment":"JSDocBlock > JSDocTag[tag=\"param\"] > JSDocTypeUnion[left.name=\"Bar\"]","disallowName":"/^opt_/i"}]}]

multiline-blocks

Controls how and whether jsdoc blocks can be expressed as single or multiple line blocks.

Note that if you set noSingleLineBlocks and noMultilineBlocks to true and configure them in a certain manner, you might effectively be prohibiting all jsdoc blocks!

Also allows for preventing text at the very beginning or very end of blocks.

Options

A single options object with the following properties.

noZeroLineText (defaults to true)

For multiline blocks, any non-whitespace text immediately after the /** and space will be reported. (Text after a newline is not reported.)

noMultilineBlocks will have priority over this rule if it applies.

noFinalLineText (defaults to true)

For multiline blocks, any non-whitespace text preceding the */ on the final line will be reported. (Text preceding a newline is not reported.)

noMultilineBlocks will have priority over this rule if it applies.

noSingleLineBlocks (defaults to false)

If this is true, any single line blocks will be reported, except those which are whitelisted in singleLineTags.

singleLineTags (defaults to ['lends', 'type'])

An array of tags which can nevertheless be allowed as single line blocks when noSingleLineBlocks is set. You may set this to a empty array to cause all single line blocks to be reported. If '*' is present, then the presence of a tag will allow single line blocks (but not if a tag is missing).

noMultilineBlocks (defaults to false)

Requires that jsdoc blocks are restricted to single lines only unless impacted by the options minimumLengthForMultiline, multilineTags, or allowMultipleTags.

minimumLengthForMultiline (defaults to not being in effect)

If noMultilineBlocks is set with this numeric option, multiline blocks will be permitted if containing at least the given amount of text.

If not set, multiline blocks will not be permitted regardless of length unless a relevant tag is present and multilineTags is set.

multilineTags (defaults to ['*'])

If noMultilineBlocks is set with this option, multiline blocks may be allowed regardless of length as long as a tag or a tag of a certain type is present.

If * is included in the array, the presence of a tags will allow for multiline blocks (but not when without any tags unless the amount of text is over an amount specified by minimumLengthForMultiline).

If the array does not include * but lists certain tags, the presence of such a tag will cause multiline blocks to be allowed.

You may set this to an empty array to prevent any tag from permitting multiple lines.

allowMultipleTags (defaults to true)

If noMultilineBlocks is set to true with this option and multiple tags are found in a block, an error will not be reported.

Since multiple-tagged lines cannot be collapsed into a single line, this option prevents them from being reported. Set to false if you really want to report any blocks.

This option will also be applied when there is a block description and a single tag (since a description cannot precede a tag on a single line, and also cannot be reliably added after the tag either).

Context	everywhere
Tags	Any (though singleLineTags and multilineTags control the application)
Recommended	true
Settings
Options	noZeroLineText, noSingleLineBlocks, singleLineTags, noMultilineBlocks, minimumLengthForMultiline, multilineTags, allowMultipleTags, noFinalLineText

The following patterns are considered problems:

/** Reported up here
 * because the rest is multiline
 */
// Message: Should have no text on the "0th" line (after the `/**`).

/** Reported up here
 * because the rest is multiline
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noZeroLineText":true}]
// Message: Should have no text on the "0th" line (after the `/**`).

/** @abc {aType} aName Reported up here
 * because the rest is multiline
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noZeroLineText":true}]
// Message: Should have no text on the "0th" line (after the `/**`).

/** @tag */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noSingleLineBlocks":true}]
// Message: Single line blocks are not permitted by your configuration.

/** @tag {someType} */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noSingleLineBlocks":true}]
// Message: Single line blocks are not permitted by your configuration.

/** @tag {someType} aName */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noSingleLineBlocks":true}]
// Message: Single line blocks are not permitted by your configuration.

/** @tag */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noSingleLineBlocks":true,"singleLineTags":["someOtherTag"]}]
// Message: Single line blocks are not permitted by your configuration.

/** desc */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noSingleLineBlocks":true,"singleLineTags":["*"]}]
// Message: Single line blocks are not permitted by your configuration.

/**
 * Desc.
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration.

/** desc
 *
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration.

/** desc
 *
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noMultilineBlocks":true,"noSingleLineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration but fixing would result in a single line block which you have prohibited with `noSingleLineBlocks`.

/**
 *
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration.

/**
 * This is not long enough to be permitted.
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"minimumLengthForMultiline":100,"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration.

/**
 * This is not long enough to be permitted.
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"allowMultipleTags":true,"minimumLengthForMultiline":100,"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration.

/**
 * This has the wrong tags so is not permitted.
 * @notTheRightTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"allowMultipleTags":false,"multilineTags":["onlyThisIsExempted"],"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration but the block has a description with a tag.

/**
 * This has too many tags so cannot be fixed ot a single line.
 * @oneTag
 * @anotherTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"allowMultipleTags":false,"multilineTags":[],"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration but the block has multiple tags.

/**
 * This has a tag and description so cannot be fixed ot a single line.
 * @oneTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"allowMultipleTags":false,"multilineTags":[],"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration but the block has a description with a tag.

/**
 * This has no tags so is not permitted.
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"multilineTags":["*"],"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration.

/**
 * This has the wrong tags so is not permitted.
 * @notTheRightTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"allowMultipleTags":false,"minimumLengthForMultiline":500,"multilineTags":["onlyThisIsExempted"],"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration but the block has a description with a tag.

/**
 * @lends This can be safely fixed to a single line.
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"multilineTags":[],"noMultilineBlocks":true,"noSingleLineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration.

/**
 * @type {aType} This can be safely fixed to a single line.
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"multilineTags":[],"noMultilineBlocks":true,"noSingleLineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration.

/**
 * @aTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"multilineTags":[],"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration.

/**
 * This is a problem when single and multiline are blocked.
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noMultilineBlocks":true,"noSingleLineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration but fixing would result in a single line block which you have prohibited with `noSingleLineBlocks`.

/** This comment is bad
 * It should not have text on line zero
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"minimumLengthForMultiline":50,"noMultilineBlocks":true,"noZeroLineText":true}]
// Message: Should have no text on the "0th" line (after the `/**`).

/**
 * @lends This can be safely fixed
 * to a single
 * line. */
// "jsdoc/multiline-blocks": ["error"|"warn", {"multilineTags":[],"noMultilineBlocks":true}]
// Message: Multiline jsdoc blocks are prohibited by your configuration.

/**
 * @someTag {aType} with Description */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noFinalLineBlocks":true}]
// Message: Should have no text on the final line (before the `*/`).

/**
 * Description */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noFinalLineBlocks":true}]
// Message: Should have no text on the final line (before the `*/`).

The following patterns are not considered problems:

/** Not reported */

/**
 *  Not reported
 */

/** Reported up here
 * because the rest is multiline
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noZeroLineText":false}]

/** @tag */

/** @lends */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noSingleLineBlocks":true}]

/** @tag */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noSingleLineBlocks":true,"singleLineTags":["tag"]}]

/** @tag */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noSingleLineBlocks":true,"singleLineTags":["*"]}]

/**
 *
 */

/**
 *
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noMultilineBlocks":false}]

/** Test */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noMultilineBlocks":true}]

/**
 * This is long enough to be permitted by our config.
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"minimumLengthForMultiline":25,"noMultilineBlocks":true}]

/**
 * This is long enough to be permitted by our config.
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"minimumLengthForMultiline":50,"noMultilineBlocks":true}]

/**
 * This has the right tag so is permitted.
 * @theRightTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"multilineTags":["theRightTag"],"noMultilineBlocks":true}]

/** This has no tags but is single line so is not permitted. */
// "jsdoc/multiline-blocks": ["error"|"warn", {"multilineTags":["*"],"noMultilineBlocks":true}]

/**
 * This has the wrong tags so is not permitted.
 * @notTheRightTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"minimumLengthForMultiline":10,"multilineTags":["onlyThisIsExempted"],"noMultilineBlocks":true}]

/**
 * This has the wrong tags so is not permitted.
 * @theRightTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"minimumLengthForMultiline":500,"multilineTags":["theRightTag"],"noMultilineBlocks":true}]

/** tag */

/**
 * @lends This is ok per multiline
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noMultilineBlocks":true,"noSingleLineBlocks":true}]

/**
 * This has too many tags so cannot be fixed ot a single line.
 * @oneTag
 * @anotherTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"multilineTags":[],"noMultilineBlocks":true}]

/**
 * This has too many tags so cannot be fixed ot a single line.
 * @oneTag
 * @anotherTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"allowMultipleTags":true,"multilineTags":[],"noMultilineBlocks":true}]

/**
 * This has a tag and description so cannot be fixed ot a single line.
 * @oneTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"allowMultipleTags":true,"multilineTags":[],"noMultilineBlocks":true}]

/**
 * This has a tag and description so cannot be fixed ot a single line.
 * @oneTag
 */
// "jsdoc/multiline-blocks": ["error"|"warn", {"allowMultipleTags":false,"multilineTags":["oneTag"],"noMultilineBlocks":true}]

/** @someTag with Description */
// "jsdoc/multiline-blocks": ["error"|"warn", {"noFinalLineBlocks":true}]

newline-after-description

Enforces a consistent padding of the block description.

Options

This rule allows one optional string argument. If it is "always" then a problem is raised when there is no newline after the description. If it is "never" then a problem is raised when there is a newline after the description. The default value is "always".

Context	everywhere
Tags	N/A (doc block)
Options	(a string matching "always" or "never")
Recommended	true

The following patterns are considered problems:

/**
 * Foo.
 *
 * Foo.
 * @foo
 */
function quux () {

}
// "jsdoc/newline-after-description": ["error"|"warn", "always"]
// Message: There must be a newline after the description of the JSDoc block.

/**
 * Foo.
 * @foo
 *
 * Foo.
 */
function quux () {

}
// "jsdoc/newline-after-description": ["error"|"warn", "always"]
// Message: There must be a newline after the description of the JSDoc block.

/**
 * Foo.
 *
 * Foo.
 * @foo
 */
function quux () {

}
// Message: There must be a newline after the description of the JSDoc block.

/**
 * Bar.
 *
 * Bar.
 *
 * @bar
 */
function quux () {

}
// "jsdoc/newline-after-description": ["error"|"warn", "never"]
// Message: There must be no newline after the description of the JSDoc block.

/**
 * Bar.
 *
 * @bar
 *
 * Bar.
 */
function quux () {

}
// "jsdoc/newline-after-description": ["error"|"warn", "never"]
// Message: There must be no newline after the description of the JSDoc block.


         /**
          * Bar.
          *
          * Bar.
          *
          * @bar
          */
         function quux () {

         }
// "jsdoc/newline-after-description": ["error"|"warn", "never"]
// Message: There must be no newline after the description of the JSDoc block.

/**
 * A.
 *
 * @typedef {object} A
 * @prop {boolean} a A.
 */
// "jsdoc/newline-after-description": ["error"|"warn", "never"]
// Message: There must be no newline after the description of the JSDoc block.

/**
 * A.
 * @typedef {object} A
 * @prop {boolean} a A.
 */
// "jsdoc/newline-after-description": ["error"|"warn", "always"]
// Message: There must be a newline after the description of the JSDoc block.


     /**
      * Service for fetching symbols.
      * @param {object} $http - Injected http helper.
      * @param {object} $q - Injected Promise api helper.
      * @param {object} $location - Injected window location object.
      * @param {object} REPORT_DIALOG_CONSTANTS - Injected handle.
      */
// Message: There must be a newline after the description of the JSDoc block.

/** An example function.
 *
 * @returns {number} An example number.
 */
function example() {
  return 42;
}
// "jsdoc/newline-after-description": ["error"|"warn", "never"]
// Message: There must be no newline after the description of the JSDoc block.

/** An example function.
 * @returns {number} An example number.
 */
function example() {
  return 42;
}
// "jsdoc/newline-after-description": ["error"|"warn", "always"]
// Message: There must be a newline after the description of the JSDoc block.

The following patterns are not considered problems:

/**
 * Foo.
 */
function quux () {

}
// "jsdoc/newline-after-description": ["error"|"warn", "always"]

/**
 * Bar.
 */
function quux () {

}
// "jsdoc/newline-after-description": ["error"|"warn", "never"]

/**
 * Foo.
 *
 * @foo
 */
function quux () {

}
// "jsdoc/newline-after-description": ["error"|"warn", "always"]

/**
 * Bar.
 * @bar
 */
function quux () {

}
// "jsdoc/newline-after-description": ["error"|"warn", "never"]


     /**
      * @foo
      * Test 
      * abc 
      * @bar 
      */


     /**
      * 
      * @foo
      * Test 
      * abc 
      * @bar 
      */

/***
 *
 */
function quux () {

}
// "jsdoc/newline-after-description": ["error"|"warn", "always"]

/**
 * Parses query string to object containing URL parameters
 * 
 * @param queryString
 * Input string
 * 
 * @returns
 * Object containing URL parameters
 */
export function parseQueryString(queryString: string): { [key: string]: string } {    // <-- Line 10 that fails

}

/** An example function.
 *
 * @returns {number} An example number.
 */
function example() {
  return 42;
}

/** An example function.
 * @returns {number} An example number.
 */
function example() {
  return 42;
}
// "jsdoc/newline-after-description": ["error"|"warn", "never"]

no-bad-blocks

This rule checks for multi-line-style comments which fail to meet the criteria of a jsdoc block, namely that it should begin with two and only two asterisks, but which appear to be intended as jsdoc blocks due to the presence of whitespace followed by whitespace or asterisks, and an at-sign (@) and some non-whitespace (as with a jsdoc block tag).

Options

Takes an optional options object with the following.

ignore

An array of directives that will not be reported if present at the beginning of a multi-comment block and at-sign /* @.

Defaults to ['ts-check', 'ts-expect-error', 'ts-ignore', 'ts-nocheck'] (some directives used by TypeScript).

preventAllMultiAsteriskBlocks

A boolean (defaulting to false) which if true will prevent all multi-asterisked blocks even those without apparent tag content.

Context	Everywhere
Tags	N/A
Recommended	false
Options	ignore, preventAllMultiAsteriskBlocks

The following patterns are considered problems:

/*
 * @param foo
 */
function quux (foo) {

}
// Message: Expected JSDoc-like comment to begin with two asterisks.

/*
 * @property foo
 */
// Message: Expected JSDoc-like comment to begin with two asterisks.

function quux() {

}
// Settings: {"jsdoc":{"structuredTags":{"see":{"name":false,"required":["name"]}}}}
// Message: Cannot add "name" to `require` with the tag's `name` set to `false`

/* @ts-ignore */
// "jsdoc/no-bad-blocks": ["error"|"warn", {"ignore":[]}]
// Message: Expected JSDoc-like comment to begin with two asterisks.

/*
 * Some description.
 *
 * @returns {string} Some string
 */
function echo() {
  return 'Something';
}
// Message: Expected JSDoc-like comment to begin with two asterisks.

/***
 * @param foo
 */
function quux (foo) {

}
// Message: Expected JSDoc-like comment to begin with two asterisks.

/***
 *
 */
function quux (foo) {

}
// "jsdoc/no-bad-blocks": ["error"|"warn", {"preventAllMultiAsteriskBlocks":true}]
// Message: Expected JSDoc-like comment to begin with two asterisks.

The following patterns are not considered problems:

/**
 * @property foo
 */

/**
 * @param foo
 */
 function quux () {

 }

function quux () {

}

/* This could just be intended as a regular multiline comment,
   so don't report this */
function quux () {

}

/* Just a regular multiline comment with an `@` but not appearing
    like a tag in a jsdoc-block, so don't report */
function quux () {

}

/* @ts-check */

/* @ts-expect-error */

/* @ts-ignore */

/* @ts-nocheck */

/* */

/* @custom */
// "jsdoc/no-bad-blocks": ["error"|"warn", {"ignore":["custom"]}]

/***
 * This is not JSDoc because of the 3 asterisks, but
 * is allowed without `preventAllMultiAsteriskBlocks`, as
 * some might wish normal multiline comments.
 */
function quux (foo) {

}

no-defaults

This rule reports defaults being used on the relevant portion of @param or @default. It also optionally reports the presence of the square-bracketed optional arguments at all.

The rule is intended to prevent the indication of defaults on tags where this would be redundant with ES6 default parameters (or for @default, where it would be redundant with the context to which the @default tag is attached).

Unless your @default is on a function, you will need to set contexts to an appropriate context, including, if you wish, "any".

Options

noOptionalParamNames

Set this to true to report the presence of optional parameters. May be used if the project is insisting on optionality being indicated by the presence of ES6 default parameters (bearing in mind that such "defaults" are only applied when the supplied value is missing or undefined but not for null or other "falsey" values).

contexts

Set this to an array of strings representing the AST context (or an object with context and comment properties) where you wish the rule to be applied. Overrides the default contexts (see below). Set to "any" if you want the rule to apply to any jsdoc block throughout your files (as is necessary for finding function blocks not attached to a function declaration or expression, i.e., @callback or @function (or its aliases @func or @method) (including those associated with an @interface).

See the "AST and Selectors" section of our README for more on the expected format.

Context	ArrowFunctionExpression, FunctionDeclaration, FunctionExpression; others when contexts option enabled
Tags	param, default
Aliases	arg, argument, defaultvalue
Recommended	false
Options	contexts, noOptionalParamNames

The following patterns are considered problems:

/**
 * @param {number} [foo="7"]
 */
function quux (foo) {

}
// Message: Defaults are not permitted on @param.

class Test {
    /**
     * @param {number} [foo="7"]
     */
    quux (foo) {

    }
}
// Message: Defaults are not permitted on @param.

/**
 * @param {number} [foo="7"]
 */
function quux (foo) {

}
// "jsdoc/no-defaults": ["error"|"warn", {"noOptionalParamNames":true}]
// Message: Optional param names are not permitted on @param.

/**
 * @arg {number} [foo="7"]
 */
function quux (foo) {

}
// Settings: {"jsdoc":{"tagNamePreference":{"param":"arg"}}}
// Message: Defaults are not permitted on @arg.

/**
 * @param {number} [foo="7"]
 */
function quux (foo) {

}
// "jsdoc/no-defaults": ["error"|"warn", {"contexts":["any"]}]
// Message: Defaults are not permitted on @param.

/**
 * @function
 * @param {number} [foo="7"]
 */
// "jsdoc/no-defaults": ["error"|"warn", {"contexts":["any"]}]
// Message: Defaults are not permitted on @param.

/**
 * @callback
 * @param {number} [foo="7"]
 */
// "jsdoc/no-defaults": ["error"|"warn", {"contexts":["any"]}]
// Message: Defaults are not permitted on @param.

/**
 * @default {}
 */
const a = {};
// "jsdoc/no-defaults": ["error"|"warn", {"contexts":["any"]}]
// Message: Default values are not permitted on @default.

/**
 * @defaultvalue {}
 */
const a = {};
// Settings: {"jsdoc":{"tagNamePreference":{"default":"defaultvalue"}}}
// "jsdoc/no-defaults": ["error"|"warn", {"contexts":["any"]}]
// Message: Default values are not permitted on @defaultvalue.

The following patterns are not considered problems:

/**
 * @param foo
 */
function quux (foo) {

}

/**
 * @param {number} foo
 */
function quux (foo) {

}

/**
 * @param foo
 */
// "jsdoc/no-defaults": ["error"|"warn", {"contexts":["any"]}]

/**
 * @function
 * @param {number} foo
 */

/**
 * @callback
 * @param {number} foo
 */

/**
 * @param {number} foo
 */
function quux (foo) {

}
// "jsdoc/no-defaults": ["error"|"warn", {"noOptionalParamNames":true}]

/**
 * @default
 */
const a = {};
// "jsdoc/no-defaults": ["error"|"warn", {"contexts":["any"]}]

no-missing-syntax

This rule lets you report if certain always expected comment structures are missing.

This (along with no-restricted-syntax) is a bit similar to Schematron for XML or jsontron for JSON--you can validate expectations of there being arbitrary structures.

This differs from the rule of the same name in eslint-plugin-query in that this rule always looks for a comment above a structure (whether or not you have a comment condition).

This rule might be especially useful with overrides where you need only require tags and/or types within specific directories (e.g., to enforce that a plugins or locale directory always has a certain form of export and comment therefor).

In addition to being generally useful for precision in requiring contexts, it is hoped that the ability to specify required tags on structures can be used for requiring @type or other types for a minimalist yet adequate specification of types which can be used to compile JavaScript+JSDoc (JJ) to WebAssembly (e.g., by converting it to TypeSscript and then using AssemblyScript to convert to WebAssembly). (It may be possible that one will need to require types with certain structures beyond function declarations and the like, as well as optionally requiring specification of number types.)

Note that you can use selectors which make use of negators like :not() including with asterisk, e.g., *:not(FunctionDeclaration) to indicate types which are not adequate to satisfy a condition, e.g., FunctionDeclaration:not(FunctionDeclaration[id.name="ignoreMe"]) would not report if there were only a function declaration of the name "ignoreMe" (though it would report by function declarations of other names).

Options

contexts

Set this to an array of strings representing the AST context (or an object with context and comment properties) where you wish the rule to be applied.

Use the minimum property (defaults to 1) to indicate how many are required for the rule to be reported.

Use the message property to indicate the specific error to be shown when an error is reported for that context being found missing. You may use {{context}} and {{comment}} with such messages.

Set to "any" if you want the rule to apply to any jsdoc block throughout your files (as is necessary for finding function blocks not attached to a function declaration or expression, i.e., @callback or @function (or its aliases @func or @method) (including those associated with an @interface).

See the "AST and Selectors" section of our README for more on the expected format.

Context	None except those indicated by contexts
Tags	Any if indicated by AST
Recommended	false
Options	contexts

The following patterns are considered problems:

/**
 * @implements {Bar|Foo}
 */
function quux () {

}
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock[postDelimiter=\"\"]:has(JsdocTypeUnion > JsdocTypeName[value=\"Foo\"]:nth-child(1))","context":"FunctionDeclaration"}]}]
// Message: Syntax is required: FunctionDeclaration with JsdocBlock[postDelimiter=""]:has(JsdocTypeUnion > JsdocTypeName[value="Foo"]:nth-child(1))

/**
 * @implements {Bar|Foo}
 */
function quux () {

}
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock[postDelimiter=\"\"]:has(JsdocTypeUnion > JsdocTypeName[value=\"Foo\"]:nth-child(1))","context":"FunctionDeclaration","message":"Problematically missing function syntax: `{{context}}` with `{{comment}}`."}]}]
// Message: Problematically missing function syntax: `FunctionDeclaration` with `JsdocBlock[postDelimiter=""]:has(JsdocTypeUnion > JsdocTypeName[value="Foo"]:nth-child(1))`.

/**
 * @implements {Bar|Foo}
 */
function quux () {

}
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":["FunctionDeclaration"]}]
// Message: Syntax is required: FunctionDeclaration

/**
 * @implements {Bar|Foo}
 */
function quux () {

}
// Message: Rule `no-missing-syntax` is missing a `context` option.

/**
 * @implements {Bar|Foo}
 */
function quux () {

}
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock[postDelimiter=\"\"]:has(JsdocTypeUnion > JsdocTypeName[value=\"Bar\"]:nth-child(1))","context":"FunctionDeclaration","minimum":2}]}]
// Message: Syntax is required: FunctionDeclaration with JsdocBlock[postDelimiter=""]:has(JsdocTypeUnion > JsdocTypeName[value="Bar"]:nth-child(1))

/**
 * @param ab
 * @param cd
 */
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","context":"any","message":"Require names matching `/^opt_/i`."}]}]
// Message: Require names matching `/^opt_/i`.

/**
 * @param ab
 * @param cd
 */
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","message":"Require names matching `/^opt_/i`."}]}]
// Message: Require names matching `/^opt_/i`.

/**
 * @param ab
 * @param cd
 */
function quux () {}
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","context":"any","message":"Require names matching `/^opt_/i`."}]}]
// Message: Require names matching `/^opt_/i`.

The following patterns are not considered problems:

/**
 * @implements {Bar|Foo}
 */
function quux () {

}
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock[postDelimiter=\"\"]:has(JsdocTypeUnion > JsdocTypeName[value=\"Bar\"]:nth-child(1))","context":"FunctionDeclaration"}]}]

/**
 * @implements {Bar|Foo}
 */
function quux () {

}

/**
 * @implements {Bar|Foo}
 */
function bar () {

}

/**
 * @implements {Bar|Foo}
 */
function baz () {

}
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock[postDelimiter=\"\"]:has(JsdocTypeUnion > JsdocTypeName[value=\"Bar\"]:nth-child(1))","context":"FunctionDeclaration","minimum":2}]}]

/**
 * @param opt_a
 * @param opt_b
 */
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","context":"any","message":"Require names matching `/^opt_/i`."}]}]

/**
 * @param opt_a
 * @param opt_b
 */
function quux () {}
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","context":"any","message":"Require names matching `/^opt_/i`."}]}]

/**
 * @param opt_a
 * @param opt_b
 */
function quux () {}
// "jsdoc/no-missing-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","message":"Require names matching `/^opt_/i`."}]}]

no-multi-asterisks

Prevents use of multiple asterisks at the beginning of lines.

Note that if you wish to prevent multiple asterisks at the very beginning of the jsdoc block, you should use no-bad-blocks (as that is not proper jsdoc and that rule is for catching blocks which only seem like jsdoc).

Options

preventAtMiddleLines (defaults to true)

Prevent the likes of this:

/**
 *
 **
 */

preventAtEnd (defaults to true)

Prevent the likes of this:

/**
 *
 *
 **/

Context	everywhere
Tags	(any)
Recommended	true
Settings
Options	preventAtEnd, preventAtMiddleLines

The following patterns are considered problems:

/**
 *
 **
 */
// Message: Should be no multiple asterisks on middle lines.

/**
 *
 **
 */
// "jsdoc/no-multi-asterisks": ["error"|"warn", {"preventAtMiddleLines":true}]
// Message: Should be no multiple asterisks on middle lines.

/**
 *
 **
 */
// "jsdoc/no-multi-asterisks": ["error"|"warn", {"preventAtEnd":false}]
// Message: Should be no multiple asterisks on middle lines.

/**
 * With a description
 * @tag {SomeType} and a tag with details
 **
 */
// Message: Should be no multiple asterisks on middle lines.

/**
 **
 *
 */
// Message: Should be no multiple asterisks on middle lines.

/**
 * Desc.
 *
 **/
// Message: Should be no multiple asterisks on end lines.

/**
 * Desc.
 *
 **/
// "jsdoc/no-multi-asterisks": ["error"|"warn", {"preventAtEnd":true}]
// Message: Should be no multiple asterisks on end lines.

/**
 * Desc.
 *
 abc * **/
// "jsdoc/no-multi-asterisks": ["error"|"warn", {"preventAtEnd":true}]
// Message: Should be no multiple asterisks on end lines.

/**
 * Desc.
 *
 **/
// "jsdoc/no-multi-asterisks": ["error"|"warn", {"preventAtMiddleLines":false}]
// Message: Should be no multiple asterisks on end lines.

/** Desc. **/
// Message: Should be no multiple asterisks on end lines.

/** @someTag name desc. **/
// Message: Should be no multiple asterisks on end lines.

/** abc * */
// Message: Should be no multiple asterisks on end lines.

/**
 * Preserve user's whitespace when fixing (though one may also
 *   use an align rule)
 *
 * */
// "jsdoc/no-multi-asterisks": ["error"|"warn", {"preventAtEnd":true}]
// Message: Should be no multiple asterisks on end lines.

The following patterns are not considered problems:

/**
 *
 * Desc. ***
 */

/**
 * Desc. ***
 *
 */

/**
 * Desc.
 *
 * sth */

/**
 **
 *
 */
// "jsdoc/no-multi-asterisks": ["error"|"warn", {"preventAtMiddleLines":false}]

/**
 *
 *
 **/
// "jsdoc/no-multi-asterisks": ["error"|"warn", {"preventAtEnd":false}]

/**
 * With a desc.
 * and ***
 */

/**
 * and ***
 * With a desc.
 */

/**
 * With a desc.
 * With a desc.
 * Desc. */

/**
 * With a description
 * @tag {SomeType} and a tag with details
 *
 */

/** abc */
function foo() {
    //
}

/** foo */
function foo(): void {
    //
}

/** @aTag abc */
function foo() {
    //
}

/**
 * **Bold**
 */

/**
 * Preserve user's bold statement when fixing.
 *
 * **Bold example:** Hi there.
 */

no-restricted-syntax

Reports when certain comment structures are present.

Note that this rule differs from ESLint's no-restricted-syntax rule in expecting values within a single options object's contexts property, and with the property context being used in place of selector (as well as allowing for comment). The format also differs from the format expected by eslint-plugin-query.

Unlike those rules, this is specific to finding comments attached to structures, (whether or not you add a specific comment condition).

Note that if your parser supports comment AST (as jsdoc-eslint-parser/ is designed to do), you can just use ESLint's rule.

Options

contexts

Set this to an array of strings representing the AST context (or an object with context and comment properties) where you wish the rule to be applied.

Use the message property to indicate the specific error to be shown when an error is reported for that context being found.

Set to "any" if you want the rule to apply to any jsdoc block throughout your files (as is necessary for finding function blocks not attached to a function declaration or expression, i.e., @callback or @function (or its aliases @func or @method) (including those associated with an @interface).

See the "AST and Selectors" section of our README for more on the expected format.

Context	None except those indicated by contexts
Tags	Any if indicated by AST
Recommended	false
Options	contexts

The following patterns are considered problems:

/**
 *
 */
function quux () {

}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":["FunctionDeclaration"]}]
// Message: Syntax is restricted: FunctionDeclaration.

/**
 *
 */
function quux () {

}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"context":"FunctionDeclaration","message":"Oops: `{{context}}`."}]}]
// Message: Oops: `FunctionDeclaration`.

/**
 * @implements {Bar|Foo}
 */
function quux () {

}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock[postDelimiter=\"\"]:has(JsdocTypeUnion > JsdocTypeName[value=\"Bar\"]:nth-child(1))","context":"FunctionDeclaration"}]}]
// Message: Syntax is restricted: FunctionDeclaration.

/**
 * @implements {Bar|Foo}
 */
function quux () {

}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock[postDelimiter=\"\"]:has(JsdocTypeUnion > JsdocTypeName[value=\"Foo\"]:nth-child(1))","context":"FunctionDeclaration","message":"The foo one: {{context}}."},{"comment":"JsdocBlock[postDelimiter=\"\"]:has(JsdocTypeUnion > JsdocTypeName[value=\"Bar\"]:nth-child(1))","context":"FunctionDeclaration","message":"The bar one: {{context}}."}]}]
// Message: The bar one: FunctionDeclaration.

/**
 * @implements {Bar|Foo}
 */
function quux () {

}
// Message: Rule `no-restricted-syntax` is missing a `context` option.

/**
 * @param opt_a
 * @param opt_b
 */
function a () {}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","context":"FunctionDeclaration","message":"Only allowing names not matching `/^opt_/i`."}]}]
// Message: Only allowing names not matching `/^opt_/i`.

/**
 * @param opt_a
 * @param opt_b
 */
function a () {}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","context":"any","message":"Only allowing names not matching `/^opt_/i`."}]}]
// Message: Only allowing names not matching `/^opt_/i`.

/**
 * @param opt_a
 * @param opt_b
 */
function a () {}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","message":"Only allowing names not matching `/^opt_/i`."}]}]
// Message: Only allowing names not matching `/^opt_/i`.

/**
 * @param opt_a
 * @param opt_b
 */
function a () {}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/not-this/])","context":"any","message":"Only allowing names not matching `/^not-this/i`."},{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","context":"any","message":"Only allowing names not matching `/^opt_/i`."}]}]
// Message: Only allowing names not matching `/^opt_/i`.

/**
 * @param opt_a
 * @param opt_b
 */
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","context":"any","message":"Only allowing names not matching `/^opt_/i`."}]}]
// Message: Only allowing names not matching `/^opt_/i`.

The following patterns are not considered problems:

/**
 *
 */
function quux () {

}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":["FunctionExpression"]}]

/**
 * @implements {Bar|Foo}
 */
function quux () {

}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock[postDelimiter=\"\"]:has(JsdocTypeUnion > JsdocTypeName[value=\"Foo\"]:nth-child(1))","context":"FunctionDeclaration"}]}]

/**
 * @param ab
 * @param cd
 */
function a () {}
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","context":"any","message":"Only allowing names not matching `/^opt_/i`."}]}]

/**
 * @param ab
 * @param cd
 */
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","context":"any","message":"Only allowing names not matching `/^opt_/i`."}]}]

/**
 * @param ab
 * @param cd
 */
// "jsdoc/no-restricted-syntax": ["error"|"warn", {"contexts":[{"comment":"JsdocBlock:has(JsdocTag[name=/opt_/])","message":"Only allowing names not matching `/^opt_/i`."}]}]

no-types

This rule reports types being used on @param or @returns.

The rule is intended to prevent the indication of types on tags where the type information would be redundant with TypeScript.

Options

contexts

Set this to an array of strings representing the AST context (or an object with context and comment properties) where you wish the rule to be applied. Overrides the default contexts (see below). Set to "any" if you want the rule to apply to any jsdoc block throughout your files (as is necessary for finding function blocks not attached to a function declaration or expression, i.e., @callback or @function (or its aliases @func or @method) (including those associated with an @interface).

See the "AST and Selectors" section of our README for more on the expected format.

Context	ArrowFunctionExpression, FunctionDeclaration, FunctionExpression; others when contexts option enabled
Tags	param, returns
Aliases	arg, argument, return
Recommended	false
Options	contexts

The following patterns are considered problems:

/**
 * @param {number} foo
 */
function quux (foo) {

}
// Message: Types are not permitted on @param.

class quux {
  /**
   * @param {number} foo
   */
  bar (foo) {

  }
}
// Message: Types are not permitted on @param.

/**
 * @param {number} foo
 */
function quux (foo) {

}
// "jsdoc/no-types": ["error"|"warn", {"contexts":["any"]}]
// Message: Types are not permitted on @param.

class quux {
  /**
   * @param {number} foo
   */
  quux (foo) {

  }
}
// "jsdoc/no-types": ["error"|"warn", {"contexts":["any"]}]
// Message: Types are not permitted on @param.

/**
 * @function
 * @param {number} foo
 */
// "jsdoc/no-types": ["error"|"warn", {"contexts":["any"]}]
// Message: Types are not permitted on @param.

/**
 * @callback
 * @param {number} foo
 */
// "jsdoc/no-types": ["error"|"warn", {"contexts":["any"]}]
// Message: Types are not permitted on @param.

/**
 * @returns {number}
 */
function quux () {

}
// Message: Types are not permitted on @returns.

/**
 * Beep
 * Boop
 *
 * @returns {number}
 */
function quux () {

}
// Message: Types are not permitted on @returns.

The following patterns are not considered problems:

/**
 * @param foo
 */
function quux (foo) {

}

/**
 * @param foo
 */
// "jsdoc/no-types": ["error"|"warn", {"contexts":["any"]}]

/**
 * @function
 * @param {number} foo
 */

/**
 * @callback
 * @param {number} foo
 */

no-undefined-types

Checks that types in jsdoc comments are defined. This can be used to check unimported types.

When enabling this rule, types in jsdoc comments will resolve as used variables, i.e. will not be marked as unused by no-unused-vars.

In addition to considering globals found in code (or in ESLint-indicated globals) as defined, the following tags will also be checked for name(path) definitions to also serve as a potential "type" for checking the tag types in the table below:

@callback, @class (or @constructor), @constant (or @const), @event, @external (or @host), @function (or @func or @method), @interface, @member (or @var), @mixin, @name, @namespace, @template (for "closure" or "typescript" settings.jsdoc.mode only), @typedef.

The following tags will also be checked but only when the mode is closure:

@package, @private, @protected, @public, @static

The following types are always considered defined.

• null, undefined, void, string, boolean, object, function, symbol
• number, bigint, NaN, Infinity
• any, *
• this, true, false
• Array, Object, RegExp, Date, Function

Note that preferred types indicated within settings.jsdoc.preferredTypes will also be assumed to be defined.

Also note that if there is an error parsing types for a tag, the function will silently ignore that tag, leaving it to the valid-types rule to report parsing errors.

If you define your own tags, you can use settings.jsdoc.structuredTags t