@xwtec/eslint-config-legacy

ESLint Configuration for xwtec es5 projects

Install

# with yarn
yarn add --dev eslint prettier @xwtec/eslint-config-legacy @xwtec/prettier-config

# with npm
npm install --save-dev eslint prettier @xwtec/eslint-config-legacy @xwtec/prettier-config

Configuration

Add following code

module.exports = {
  extends: ['@xwtec/legacy'],
};

to .eslintrc.js in your project.

You may also want config prettier with @xwtec/prettier-config.

Usage

npx eslint "**/*.js"

Rules

Error

#	Type	Rule	Description
1	error	no-caller	disallow the use of arguments.caller or arguments.callee
2	error	no-delete-var	disallow deleting variables
3	error	no-dupe-args	disallow duplicate arguments in function definitions
4	error	no-dupe-else-if	disallow duplicate conditions in if-else-if chains
5	error	no-dupe-keys	disallow duplicate keys in object literals
6	error	no-empty-pattern	disallow empty destructuring patterns
7	error	no-eval	disallow the use of eval()
8	error	no-func-assign	disallow reassigning function declarations
9	error	no-implied-eval	disallow the use of eval()-like methods
10	error	no-import-assign	disallow assigning to imported bindings
11	error	no-irregular-whitespace	disallow irregular whitespace
12	error	no-obj-calls	disallow calling global object properties as functions
13	error	no-redeclare	disallow variable redeclaration
14	error	no-self-compare	disallow comparisons where both sides are exactly the same
15	error	no-sequences	disallow comma operators
16	error	no-setter-return	disallow returning values from setters
17	error	no-undef	disallow the use of undeclared variables unless mentioned in /*global */ comments
18	error	radix	enforce the consistent use of the radix argument when using parseInt()
19	error	use-isnan	require calls to isNaN() when checking for NaN

Warn

#	Type	Rule	Description
1	warn	default-case-last	enforce default clauses in switch statements to be last
2	warn	for-direction	enforce "for" loop update clause moving the counter in the right direction.
3	warn	getter-return	enforce return statements in getters
4	warn	no-case-declarations	disallow lexical declarations in case clauses
5	warn	no-catch-shadow	disallow catch clause parameters from shadowing variables in the outer scope
6	warn	no-compare-neg-zero	disallow comparing against -0
7	warn	no-constant-condition	disallow constant expressions in conditions
8	warn	no-duplicate-case	disallow duplicate case labels
9	warn	no-empty	disallow empty block statements
10	warn	no-empty-character-class	disallow empty character classes in regular expressions
11	warn	no-ex-assign	disallow reassigning exceptions in catch clauses
12	warn	no-extend-native	disallow extending native types
13	warn	no-fallthrough	disallow fallthrough of case statements
14	warn	no-global-assign	disallow assignments to native objects or read-only global variables
15	warn	no-inner-declarations	disallow variable or function declarations in nested blocks
16	warn	no-invalid-regexp	disallow invalid regular expression strings in RegExp constructors
17	warn	no-iterator	disallow the use of the __iterator__ property
18	warn	no-labels	disallow labeled statements
19	warn	no-multi-str	disallow multiline strings
20	warn	no-new-wrappers	disallow new operators with the String, Number, and Boolean objects
21	warn	no-octal	disallow octal literals
22	warn	no-octal-escape	disallow octal escape sequences in string literals
23	warn	no-proto	disallow the use of the __proto__ property
24	warn	no-restricted-globals	disallow specified global variables
25	warn	no-restricted-properties	disallow certain properties on certain objects
26	warn	no-self-assign	disallow assignments where both sides are exactly the same
27	warn	no-sparse-arrays	disallow sparse arrays
28	warn	no-throw-literal	disallow throwing literals as exceptions
29	warn	no-unmodified-loop-condition	disallow unmodified loop conditions
30	warn	no-unreachable	disallow unreachable code after return, throw, continue, and break statements
31	warn	no-unsafe-finally	disallow control flow statements in finally blocks
32	warn	no-unsafe-negation	disallow negating the left operand of relational operators
33	warn	no-unsafe-optional-chaining	disallow use of optional chaining in contexts where the undefined value is not allowed
34	warn	no-unused-vars	disallow unused variables
35	warn	no-useless-escape	disallow unnecessary escape characters
36	warn	no-void	disallow void operators
37	warn	no-with	disallow with statements
38	warn	valid-typeof	enforce comparing typeof expressions against valid strings

Fixable

#	Type	Rule	Description
1	warn	comma-style	enforce consistent comma style
2	warn	curly	enforce consistent brace style for all control statements
3	warn	dot-notation	enforce dot notation whenever possible
4	error	eqeqeq	require the use of === and !==
5	warn	no-div-regex	disallow division operators explicitly at the beginning of regular expressions
6	warn	no-else-return	disallow else blocks after return statements in if statements
7	warn	no-extra-bind	disallow unnecessary calls to .bind()
8	warn	no-extra-boolean-cast	disallow unnecessary boolean casts
9	warn	no-extra-label	disallow unnecessary labels
10	warn	no-regex-spaces	disallow multiple spaces in regular expressions
11	warn	no-undef-init	disallow initializing variables to undefined
12	warn	no-unneeded-ternary	disallow ternary operators when simpler alternatives exist
13	warn	no-unused-labels	disallow unused labels
14	warn	no-useless-return	disallow redundant return statements
15	warn	one-var	enforce variables to be declared either together or separately in functions
16	warn	operator-assignment	require or disallow assignment operator shorthand where possible
17	warn	spaced-comment	enforce consistent spacing after the // or /* in a comment
18	warn	strict	require or disallow strict mode directives
19	warn	yoda	require or disallow "Yoda" conditions
20	warn	prettier/prettier

Related

• @xwtec/eslint-config
• @xwtec/eslint-config-vue
• @xwtec/prettier-config

Links

• ESLint
• Prettier