eslint-plugin-eslint-plugin

An ESLint plugin for linting ESLint plugins. Rules written in CJS, ESM, and TypeScript are all supported.

• Installation
• Usage
  • .eslintrc.json
  • eslint.config.js (requires eslint>=v8.23.0)
• Rules
  • Rules
  • Tests
• Presets
  • Semantic versioning policy
  • Preset usage

Installation

You'll first need to install ESLint:

npm i eslint --save-dev

Next, install eslint-plugin-eslint-plugin:

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

Usage

Here's an example ESLint configuration that:

• Sets sourceType to script for CJS plugins (most users) (use module for ESM/TypeScript)
• Enables the recommended configuration
• Enables an optional/non-recommended rule

.eslintrc.json

{
  "extends": ["plugin:eslint-plugin/recommended"],
  "rules": {
    "eslint-plugin/require-meta-docs-description": "error"
  }
}

eslint.config.js (requires eslint>=v8.23.0)

const eslintPlugin = require('eslint-plugin-eslint-plugin');
module.exports = [
  eslintPlugin.configs['flat/recommended'],
  {
    rules: {
      'eslint-plugin/require-meta-docs-description': 'error',
    },
  },
];

Rules

💼 Configurations enabled in.
✅ Set in the recommended configuration.
🔧 Automatically fixable by the --fix CLI option.
💡 Manually fixable by editor suggestions.
💭 Requires type information.

Rules

Name	Description	💼	🔧	💡	💭
fixer-return	require fixer functions to return a fix	✅
meta-property-ordering	enforce the order of meta properties		🔧
no-deprecated-context-methods	disallow usage of deprecated methods on rule context objects	✅	🔧
no-deprecated-report-api	disallow the version of context.report() with multiple arguments	✅	🔧
no-missing-message-ids	disallow messageIds that are missing from meta.messages	✅
no-missing-placeholders	disallow missing placeholders in rule report messages	✅
no-property-in-node	disallow using in to narrow node types instead of looking at properties				💭
no-unused-message-ids	disallow unused messageIds in meta.messages	✅
no-unused-placeholders	disallow unused placeholders in rule report messages	✅
no-useless-token-range	disallow unnecessary calls to sourceCode.getFirstToken() and sourceCode.getLastToken()	✅	🔧
prefer-message-ids	require using messageId instead of message or desc to report rule violations	✅
prefer-object-rule	disallow function-style rules	✅	🔧
prefer-placeholders	require using placeholders for dynamic report messages
prefer-replace-text	require using replaceText() instead of replaceTextRange()
report-message-format	enforce a consistent format for rule report messages
require-meta-docs-description	require rules to implement a meta.docs.description property with the correct format
require-meta-docs-url	require rules to implement a meta.docs.url property		🔧
require-meta-fixable	require rules to implement a meta.fixable property	✅
require-meta-has-suggestions	require suggestable rules to implement a meta.hasSuggestions property	✅	🔧
require-meta-schema	require rules to implement a meta.schema property	✅		💡
require-meta-type	require rules to implement a meta.type property	✅

Tests

Name	Description	💼	🔧	💡	💭
consistent-output	enforce consistent use of output assertions in rule tests
no-identical-tests	disallow identical tests	✅	🔧
no-only-tests	disallow the test case property only	✅		💡
prefer-output-null	disallow invalid RuleTester test cases where the output matches the code	✅	🔧
test-case-property-ordering	require the properties of a test case to be placed in a consistent order		🔧
test-case-shorthand-strings	enforce consistent usage of shorthand strings for test cases with no options		🔧

Presets

	Name	Description
✅	recommended	enables all recommended rules in this plugin
	rules-recommended	enables all recommended rules that are aimed at linting ESLint rule files
	tests-recommended	enables all recommended rules that are aimed at linting ESLint test files
	all	enables all rules in this plugin, excluding those requiring type information
	all-type-checked	enables all rules in this plugin, including those requiring type information
	rules	enables all rules that are aimed at linting ESLint rule files
	tests	enables all rules that are aimed at linting ESLint test files

Semantic versioning policy

The list of recommended rules will only change in a major release of this plugin. However, new non-recommended rules might be added in a minor release of this plugin. Therefore, using the all, rules, and tests presets is not recommended for production use, because the addition of new rules in a minor release could break your build.

Preset usage

Both flat and eslintrc configs are supported. For example, to enable the recommended preset, use:

eslint.config.js

const eslintPlugin = require('eslint-plugin-eslint-plugin');
module.exports = [eslintPlugin.configs['flat/recommended']];

.eslintrc.json

{
  "extends": ["plugin:eslint-plugin/recommended"]
}

Or to apply linting only to the appropriate rule or test files:

eslint.config.js

const eslintPlugin = require('eslint-plugin-eslint-plugin');
module.exports = [
  {
    files: ['lib/rules/*.{js,ts}'],
    ...eslintPlugin.configs['flat/rules-recommended'],
  },
  {
    files: ['tests/lib/rules/*.{js,ts}'],
    ...eslintPlugin.configs['flat/tests-recommended'],
  },
];

.eslintrc.js

{
  "overrides": [
    {
      "files": ["lib/rules/*.{js,ts}"],
      "extends": ["plugin:eslint-plugin/rules-recommended"]
    },
    {
      "files": ["tests/lib/rules/*.{js,ts}"],
      "extends": ["plugin:eslint-plugin/tests-recommended"]
    }
  ]
}