@anmiles/eslint-config

Base eslint config for all projects

Flat config

This config is based on ESLint 9 flat config. To keep using legacy config, please consider installing @anmiles/[email protected]

Configs

Config	Code
Base	...configs.base
TS	...configs.ts
React	...configs.react
Jest	...configs.jest

For JS-only projects (without TS, Jest, React) use base config. For more complex projects use combination of configs. Note that base config is mandatory in all cases.

Installation

1. Install this package

   npm install --save-dev @anmiles/eslint-config

2. Install required devDependencies
   • Base dependencies for all files:

      npm install --save-dev eslint eslint-plugin-align-assignments eslint-plugin-i18next eslint-plugin-import eslint-plugin-n eslint-plugin-promise @eslint/compat @eslint/css @eslint/js @eslint/json @eslint/markdown @stylistic/eslint-plugin

   • Additional dependencies for TS:

      npm install --save-dev @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint-import-resolver-typescript jiti typescript

   • Additional dependencies for React:

      npm install --save-dev eslint-plugin-react eslint-plugin-react-hooks eslint-plugin-react-redux eslint-plugin-react-refresh

   • Additional dependencies for Jest:

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

Usage

1. Extend all needed configs in your ./eslint.config.mjs (or ./eslint.config.js for ESM projects)

   • For JS-only projects (without TS, React, Jest) use base config:

      import { configs } from '@anmiles/eslint-config';
     
      export default [
      	...configs.base,
     
      	/* your own config */
      ];

   • For more complex projects use combination of configs
     • Backend TS project with Jest:

        import { configs } from '@anmiles/eslint-config';
       
        export default [
        	...configs.base,
        	...configs.ts,
        	...configs.jest,
       
        	/* your own config */
        ];

     • Frontend TS project with React and Jest:

        import { configs } from '@anmiles/eslint-config';
       
        export default [
        	...configs.base,
        	...configs.ts,
        	...configs.jest,
        	...configs.react,
       
        	/* your own config */
        ];

   • Also you can use type-checked config - ./eslint.config.mts (or ./eslint.config.ts for ESM projects). This requires jiti (why?)

      import type { Linter } from 'eslint';
      import { configs } from '@anmiles/eslint-config';
     
      export default [
      		...configs.base,
      		...configs.ts,
      		...configs.jest,
      		...configs.react,
     
      	/* your own config */
     
      ] as Linter.Config[];

2. Specify npm commands

   "lint": "eslint",
   "lint:fix": "eslint --fix"

   • --ext parameter is not used in Flat Config mode
   • Specifying target directory (.) is not needed in Flat Config mode

Example

Javascript:

import stylisticEslintPlugin from '@stylistic/eslint-plugin';
import { patterns, configs } from '@anmiles/eslint-config';

export default [
	...configs.base,
	...configs.ts,
	...configs.jest,

	{
		ignores : [
			'coverage/*',
			'dist/*',
			'**/__snapshots__/*',
		],
	},

	{
		files : patterns.base,
		rules : {
			'@stylistic/max-len' : [ 'error', {
				code           : 100,
				tabWidth       : 4,
				ignoreComments : true,
			} ],
			'@stylistic/object-property-newline' : [ 'error', {
				allowAllPropertiesOnSameLine : true,
			} ],
			// override for TS-ESM project
			'import/extensions' : [ 'error', 'ignorePackages', {
				'js'  : 'always',
				'mjs' : 'always',
				'ts'  : 'never',
				'mts' : 'never',
			} ],
		},
	},

	{
		files : patterns.ts,
		rules : {
			'@typescript-eslint/no-unsafe-type-assertion' : [ 'off' ],
		},
	},
];

Typescript:

import stylisticEslintPlugin from '@stylistic/eslint-plugin';
import type { Linter } from 'eslint';
import { patterns, configs } from '@anmiles/eslint-config';

export default [
	...configs.base,
	...configs.ts,
	...configs.jest,

	{
		ignores : [
			'coverage/*',
			'dist/*',
			'**/__snapshots__/*',
		],
	},

	{
		files : patterns.base,
		rules : {
			'@stylistic/max-len' : [ 'error', {
				code           : 100,
				tabWidth       : 4,
				ignoreComments : true,
			} ],
			'@stylistic/object-property-newline' : [ 'error', {
				allowAllPropertiesOnSameLine : true,
			} ],
			// override for TS-ESM project
			'import/extensions' : [ 'error', 'ignorePackages', {
				'js'  : 'always',
				'mjs' : 'always',
				'ts'  : 'never',
				'mts' : 'never',
			} ],
		},
	},

	{
		files : patterns.ts,
		rules : {
			'@typescript-eslint/no-unsafe-type-assertion' : [ 'off' ],
		},
	},
] as Linter.Config[];

Exported constants

Patterns and extensions are also exported.

import { patterns, configs } from '@anmiles/eslint-config';

console.log(extensions.base); // [ '.js', '.mjs', '.cjs', '.jsx', '.ts', '.cts', '.mts', '.tsx' ]
console.log(extensions.jest); // [ '.test.js', '.test.mjs', '.test.cjs', '.test.jsx', '.test.ts', '.test.cts', '.test.mts', '.test.tsx' ]
console.log(patterns.ts);     // [ '**/*.ts', '**/*.cts', '**/*.mts', '**/*.tsx' ]
console.log(patterns.react);  // [ '**/*.js', '**/*.mjs', '**/*.cjs', '**/*.jsx', '**/*.ts', '**/*.cts', '**/*.mts', '**/*.tsx' ]

Notes

• package-lock.json doesn't have to be ignored. It's already ignored in configuration for json plugin inside base config.
• node_modules doesn't have to be ignored. It's implicitly ignored by ESLint.
• Remember to provide files option in override sections to specify a set of extensions for which the section applies.
  • There are some patterns to use (see above)
• Don't keep .eslintignore file when using Flat Config. Use ignores config key instead (see the example above).

Migration to ESLint V9 flat configuration

Version 9 is based on ESLint V9 flat configuration. See migration guide if you had been using version 8 or below.

Links

Release notes of ESLint plugins

• Releases · @eslint/css

• Releases · @eslint/js

• Releases · @eslint/json

• Releases · @eslint/markdown

• Releases · @stylistic/eslint-plugin

• Releases · @typescript-eslint/eslint-plugin

• Releases · eslint-plugin-align-assignments

• Releases · eslint-plugin-i18next

• Releases · eslint-plugin-import

• Releases · eslint-plugin-jest

• Releases · eslint-plugin-n

• Releases · eslint-plugin-promise

• Releases · eslint-plugin-react

• Releases · eslint-plugin-react-hooks

• Releases · eslint-plugin-react-redux

• Releases · eslint-plugin-react-refresh