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eslint.config.js
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/* eslint-disable id-length, max-lines, no-magic-numbers,
import/max-dependencies */
import { builtinModules } from 'node:module'
import { fixupPluginRules } from '@eslint/compat'
import markdown from '@eslint/markdown'
import stylisticJs from '@stylistic/eslint-plugin-js'
import stylisticPlus from '@stylistic/eslint-plugin-plus'
import stylisticTs from '@stylistic/eslint-plugin-ts'
import ava from 'eslint-plugin-ava'
import eslintComments from 'eslint-plugin-eslint-comments'
import filenames from 'eslint-plugin-filenames'
import fp from 'eslint-plugin-fp'
import html from 'eslint-plugin-html'
import importPlugin from 'eslint-plugin-import'
import n from 'eslint-plugin-n'
import preferArrowFunctions from 'eslint-plugin-prefer-arrow-functions'
import promise from 'eslint-plugin-promise'
import unicorn from 'eslint-plugin-unicorn'
import globals from 'globals'
import typescriptEslint from 'typescript-eslint'
// Prefer `if` + `throw new Error()` instead of `assert()` as it does not work
// in browsers
const avoidAssert = {
group: ['node:assert', 'assert', 'node:assert/strict', 'assert/strict'],
message: 'Please throw an Error instead',
}
const avoidUnitTests = {
group: ['./*', '!./helpers', '!./fixtures'],
message:
'Individual files should not be imported in tests. Instead please use import the main module.',
}
const nExtensions = [
'.js',
'.cjs',
'.mjs',
'.ts',
'.cts',
'.mts',
'.json',
'.node',
]
const mutableProperties = [
{ object: 'process', property: 'exitCode' },
{ object: 'error' },
{ object: 'req' },
{ object: 'request' },
{ object: 'res' },
{ object: 'response' },
{ object: 'state' },
]
const mutableObjects = mutableProperties.map(({ object }) => object)
// Allow default exports for those Node.js code modules
const DEFAULT_BUILTIN_MODULES = new Set([
'assert',
'assert/strict',
'module',
'process',
])
const importStyles = Object.fromEntries(
builtinModules.map((builtinModule) => [
`node:${builtinModule}`,
{ named: true, default: DEFAULT_BUILTIN_MODULES.has(builtinModule) },
]),
)
const forbiddenGlobals = [
// Use `globalThis` instead
'global',
'GLOBAL',
// Use module.exports instead
'exports',
// Use import ... from 'node:process|buffer' instead
'process',
'Buffer',
]
// Some rules have both JavaScript and TypeScript equivalents.
// This is the set for JavaScript.
const javaScriptRules = {
// Conflicts with Prettier
'@stylistic/js/block-spacing': 0,
'@stylistic/js/brace-style': 0,
'@stylistic/js/comma-dangle': 0,
'@stylistic/js/comma-spacing': 0,
'@stylistic/js/function-call-spacing': 0,
'@stylistic/js/indent': 0,
'@stylistic/js/key-spacing': 0,
'@stylistic/js/keyword-spacing': 0,
'@stylistic/js/lines-around-comment': 0,
'@stylistic/js/no-extra-parens': 0,
'@stylistic/js/no-extra-semi': 0,
'@stylistic/js/object-curly-spacing': 0,
'@stylistic/js/quotes': 0,
'@stylistic/js/semi': 0,
'@stylistic/js/space-before-blocks': 0,
'@stylistic/js/space-before-function-paren': 0,
'@stylistic/js/space-infix-ops': 0,
// Blank lines
'@stylistic/js/padding-line-between-statements': [
2,
{
blankLine: 'always',
prev: ['multiline-block-like', 'directive'],
next: '*',
},
{ blankLine: 'always', prev: '*', next: 'multiline-block-like' },
],
'@stylistic/js/lines-between-class-members': [
2,
'always',
{ exceptAfterSingleLine: true },
],
// Referencing
'no-unused-vars': 2,
'no-redeclare': 2,
'no-shadow': [
2,
{
builtinGlobals: true,
hoist: 'all',
allow: ['process', 'Buffer', 'setTimeout', 'setInterval', 'setImmediate'],
},
],
'no-use-before-define': [
2,
{ functions: false, classes: false, variables: false },
],
// Declarations
'no-magic-numbers': [
2,
{ ignore: [-2, -1, 0, 1, 2, 3, 10, '0n', '1n'], enforceConst: true },
],
// Assignments
'init-declarations': 2,
'no-unused-expressions': 2,
// Functions
'no-loop-func': 2,
'max-params': 2,
'default-param-last': 2,
'no-empty-function': 2,
// Objects
'dot-notation': 2,
'prefer-destructuring': 2,
// Inheritance
'no-useless-constructor': 2,
'class-methods-use-this': 2,
'no-invalid-this': 2,
'no-dupe-class-members': 2,
// Arrays
'no-array-constructor': 2,
// Number
'no-loss-of-precision': 2,
// Async
'prefer-promise-reject-errors': 2,
'require-await': 2,
// Modules
// Prefer `if` + `throw new Error()` instead of `assert()` as it does not
// work in browsers
'no-restricted-imports': [2, { patterns: [avoidAssert] }],
// To avoid
'no-implied-eval': 2,
}
// This is the set of those rules for TypeScript
const typeScriptRules = {
// Same rules as JavaScript files, but for TypeScript
...Object.fromEntries(
Object.entries(javaScriptRules).map(([ruleName, definition]) =>
ruleName.startsWith('@stylistic/js/')
? [ruleName.replace('@stylistic/js/', '@stylistic/ts/'), definition]
: [`@typescript-eslint/${ruleName}`, definition],
),
),
// Overrides JavaScript rules definitions
'@stylistic/ts/padding-line-between-statements': [
2,
{
blankLine: 'always',
prev: ['multiline-block-like', 'directive', 'interface', 'type'],
next: '*',
},
{ blankLine: 'always', prev: '*', next: 'multiline-block-like' },
],
'@typescript-eslint/no-redeclare': [2, { ignoreDeclarationMerge: true }],
'@typescript-eslint/no-magic-numbers': [
2,
{
ignore: [-2, -1, 0, 1, 2, 3, 10, '0n', '1n'],
enforceConst: true,
ignoreEnums: true,
ignoreNumericLiteralTypes: true,
ignoreTypeIndexes: true,
},
],
'@typescript-eslint/prefer-destructuring': [
2,
// TODO: uncomment this. This is currently failing due to a bug with
// @typescript-eslint/eslint-parser for this rule
// { enforceForDeclarationWithTypeAnnotation: true },
],
'@typescript-eslint/no-restricted-imports': [
2,
{ patterns: [{ ...avoidAssert, allowTypeImports: true }] },
],
}
// See /~https://github.com/eslint/rewrite/issues/127
const fixupOldPluginRules = ({ rules, ...plugin }) => ({
...plugin,
rules: Object.fromEntries(
Object.entries(rules).map(([ruleName, rule]) => [
ruleName,
fixupOldPluginRule(rule),
]),
),
})
const fixupOldPluginRule = (rule) => ({
...rule,
create: typeof rule === 'function' ? rule : rule.create,
schema: undefined,
meta: {
...rule.meta,
schema: rule.schema ?? rule.create?.schema ?? [{}],
},
})
export default [
importPlugin.flatConfigs.errors,
{
// The rules added by eslint-config-prettier are inlined explicitly instead
plugins: {
'@stylistic/js': stylisticJs,
'@stylistic/ts': stylisticTs,
'@stylistic/plus': stylisticPlus,
ava,
'eslint-comments': fixupPluginRules(eslintComments),
filenames: fixupPluginRules(fixupOldPluginRules(filenames)),
fp: fixupPluginRules(fixupOldPluginRules(fp)),
markdown,
'prefer-arrow-functions': preferArrowFunctions,
unicorn,
n,
promise,
},
languageOptions: {
sourceType: 'module',
ecmaVersion: 'latest',
globals: {
...globals.node,
document: 'readonly',
navigator: 'readonly',
window: 'readonly',
},
parserOptions: {
ecmaFeatures: { jsx: false },
projectService: true,
},
},
linterOptions: {
reportUnusedDisableDirectives: 'error',
reportUnusedInlineConfigs: 'error',
},
settings: {
n: { tryExtensions: nExtensions },
'import/resolver': {
node: { extensions: nExtensions },
typescript: { project: 'tsconfig.json' },
},
},
rules: {
// Conflicts with Prettier
'@stylistic/js/array-bracket-newline': 0,
'@stylistic/js/array-bracket-spacing': 0,
'@stylistic/js/array-element-newline': 0,
'@stylistic/js/arrow-parens': 0,
'@stylistic/js/arrow-spacing': 0,
'@stylistic/js/comma-style': 0,
'@stylistic/js/computed-property-spacing': 0,
'@stylistic/js/curly-newline': 0,
'@stylistic/js/dot-location': 0,
'@stylistic/js/eol-last': 0,
'@stylistic/js/function-call-argument-newline': 0,
'@stylistic/js/function-paren-newline': 0,
'@stylistic/js/generator-star-spacing': 0,
'@stylistic/js/implicit-arrow-linebreak': 0,
'@stylistic/js/jsx-quotes': 0,
'@stylistic/js/linebreak-style': 0,
'@stylistic/js/max-len': 0,
'@stylistic/js/max-statements-per-line': 0,
'@stylistic/js/new-parens': 0,
'@stylistic/js/newline-per-chained-call': 0,
'@stylistic/js/no-confusing-arrow': 0,
'@stylistic/js/no-floating-decimal': 0,
'@stylistic/js/no-mixed-operators': 0,
'@stylistic/js/no-mixed-spaces-and-tabs': 0,
'@stylistic/js/no-multi-spaces': 0,
'@stylistic/js/no-multiple-empty-lines': 0,
'@stylistic/js/no-trailing-spaces': 0,
'@stylistic/js/no-whitespace-before-property': 0,
'@stylistic/js/nonblock-statement-body-position': 0,
'@stylistic/js/object-curly-newline': 0,
'@stylistic/js/object-property-newline': 0,
'@stylistic/js/one-var-declaration-per-line': 0,
'@stylistic/js/operator-linebreak': 0,
'@stylistic/js/padded-blocks': 0,
'@stylistic/js/quote-props': 0,
'@stylistic/js/rest-spread-spacing': 0,
'@stylistic/js/semi-spacing': 0,
'@stylistic/js/semi-style': 0,
'@stylistic/js/space-in-parens': 0,
'@stylistic/js/space-unary-ops': 0,
'@stylistic/js/switch-colon-spacing': 0,
'@stylistic/js/template-curly-spacing': 0,
'@stylistic/js/template-tag-spacing': 0,
'@stylistic/js/wrap-iife': 0,
'@stylistic/js/wrap-regex': 0,
'@stylistic/js/yield-star-spacing': 0,
'no-unexpected-multiline': 0,
'unicorn/no-nested-ternary': 0,
'unicorn/empty-brace-spaces': 0,
'unicorn/number-literal-case': 0,
'unicorn/template-indent': 0,
// Warned against, but allowed by eslint-config-prettier
'@stylistic/js/no-tabs': 2,
// Globals
'n/prefer-global/console': 2,
'n/prefer-global/url-search-params': 2,
'n/prefer-global/text-decoder': 2,
'n/prefer-global/text-encoder': 2,
'n/prefer-global/url': 2,
// We only use globals for globals also defined in the browser
'n/prefer-global/buffer': [2, 'never'],
'n/prefer-global/process': [2, 'never'],
// Comments
'no-inline-comments': [2, { ignorePattern: 'c8' }],
'@stylistic/js/multiline-comment-style': [2, 'separate-lines'],
'@stylistic/js/line-comment-position': 2,
'@stylistic/js/spaced-comment': [
2,
'always',
{
line: { markers: ['*package', '!', '/', ',', '='] },
block: {
balanced: true,
markers: ['*package', '!', ',', ':', '::', 'flow-include'],
exceptions: ['*'],
},
},
],
// This makes commenting/uncommenting code tedious
'capitalized-comments': 0,
// We allow TODO comments
'no-warning-comments': 0,
'unicorn/expiring-todo-comments': 0,
'eslint-comments/disable-enable-pair': 2,
'eslint-comments/no-unused-enable': 2,
'eslint-comments/no-duplicate-disable': 2,
'eslint-comments/no-unlimited-disable': 2,
'unicorn/no-abusive-eslint-disable': 2,
'eslint-comments/no-aggregating-enable': 2,
// No use
'eslint-comments/no-restricted-disable': 0,
'eslint-comments/no-use': [
2,
{
allow: [
'eslint-disable-next-line',
'eslint-disable',
'eslint-enable',
'eslint-env',
],
},
],
// This requires putting comments on the same line as the ESLint
// directive, but we prefer to put the comment on the previous line
'eslint-comments/require-description': 0,
'eslint-comments/no-unused-disable': 2,
// Strictness
strict: 2,
// Indentation
'@stylistic/plus/indent-binary-ops': 0,
// Whitespaces
'no-irregular-whitespace': 2,
'unicode-bom': 2,
// Braces
curly: 2,
// Statements
'no-empty': [2, { allowEmptyCatch: true }],
'no-unreachable': 2,
'no-unreachable-loop': 2,
// Parenthesis
'unicorn/no-unreadable-iife': 2,
// Complexity
'max-lines': [2, { max: 90, skipBlankLines: true, skipComments: true }],
'max-lines-per-function': [
2,
{ max: 50, skipBlankLines: true, skipComments: true, IIFEs: true },
],
'max-statements': [2, 10],
'import/max-dependencies': 2,
// This counts default values as complexity, which prevents using them
complexity: 0,
'max-depth': [2, 1],
'max-nested-callbacks': [2, 1],
// Referencing
'no-undef': [2, { typeof: true }],
'no-undef-init': 2,
'unicorn/no-unused-properties': 2,
'no-shadow-restricted-names': 2,
// Declarations
'block-scoped-var': 2,
'no-const-assign': 2,
'no-var': 2,
'fp/no-let': 2,
'import/no-mutable-exports': 2,
'prefer-const': 2,
'no-global-assign': 2,
'no-implicit-globals': [2, { lexicalBindings: true }],
'one-var': [2, { initialized: 'never' }],
'vars-on-top': 2,
'no-inner-declarations': [
2,
'functions',
{ blockScopedFunctions: 'disallow' },
],
'sort-vars': 2,
// Assignments
'no-plusplus': [2, { allowForLoopAfterthoughts: true }],
'operator-assignment': 2,
'logical-assignment-operators': 2,
'no-multi-assign': 2,
'prefer-object-spread': 2,
'unicorn/no-useless-fallback-in-spread': 2,
'no-cond-assign': 2,
'no-return-assign': 2,
'no-self-assign': 2,
'no-param-reassign': [
2,
{ props: true, ignorePropertyModificationsFor: mutableObjects },
],
'fp/no-mutation': [2, { commonjs: true, exceptions: mutableProperties }],
'no-delete-var': 2,
'fp/no-delete': 2,
'fp/no-mutating-assign': 2,
'fp/no-mutating-methods': [
2,
{
allowedObjects: [
...mutableObjects,
// gulp.watch() is flagged as mutable otherwise
'gulp',
],
},
],
'no-useless-assignment': 2,
// This is too strict
'fp/no-unused-expression': 0,
'no-new': 2,
'import/no-unassigned-import': [
2,
{ allow: ['@ehmicky/dev-tasks/register.js'] },
],
// Naming
camelcase: [
2,
{ allow: ['^UNSAFE_'], properties: 'never', ignoreGlobals: true },
],
'id-length': [
2,
{
max: 24,
exceptions: [
// ava requires `test` to be called `t` for `power-assert` to work
't',
// Returned by yargs
'_',
],
},
],
'id-match': [2, '^[A-Za-z0-9_]+$', { onlyDeclarations: true }],
'no-underscore-dangle': [
2,
{
enforceInMethodNames: true,
allowInArrayDestructuring: false,
allowInObjectDestructuring: false,
// Often used in several libraries
allow: ['_id'],
},
],
// Too unstable for the moment:
// /~https://github.com/sindresorhus/eslint-plugin-unicorn/issues/269
// /~https://github.com/sindresorhus/eslint-plugin-unicorn/issues/270
'unicorn/prevent-abbreviations': 0,
// Too cumbersome
'unicorn/no-keyword-prefix': 0,
// No use
'id-denylist': 0,
'new-cap': 2,
// Typecasting
'no-extra-boolean-cast': [2, { enforceForInnerExpressions: true }],
'no-implicit-coercion': [2, { disallowTemplateShorthand: true }],
'unicorn/explicit-length-check': [2, { 'non-zero': 'not-equal' }],
'unicorn/prefer-native-coercion-functions': 2,
'no-new-wrappers': 2,
'no-new-native-nonconstructor': 2,
'unicorn/new-for-builtins': 2,
'fp/no-valueof-field': 2,
// Tests
'no-unsafe-negation': [2, { enforceForOrderingRelations: true }],
eqeqeq: [2, 'always', { null: 'ignore' }],
// == null is sometimes a good shorthand
'no-eq-null': 0,
'unicorn/no-negation-in-equality-check': 2,
'valid-typeof': 2,
'unicorn/no-instanceof-array': 2,
'no-negated-condition': 2,
'unicorn/no-negated-condition': 2,
'no-constant-condition': 2,
'no-constant-binary-expression': 2,
'no-self-compare': 2,
'no-dupe-else-if': 2,
yoda: 2,
'no-nested-ternary': 2,
// We allow ternaries, they can make code look cleaner
'no-ternary': 0,
'no-unneeded-ternary': [2, { defaultAssignment: false }],
'@stylistic/js/multiline-ternary': [2, 'always-multiline'],
'unicorn/prefer-ternary': 2,
'unicorn/prefer-logical-operator-over-ternary': 2,
// Structures
'no-lone-blocks': 2,
'no-lonely-if': 2,
'unicorn/no-lonely-if': 2,
'no-else-return': [2, { allowElseIf: false }],
'no-unmodified-loop-condition': 2,
'for-direction': 2,
'unicorn/no-for-loop': 2,
'guard-for-in': 2,
'fp/no-loops': 2,
// Switch
'no-restricted-syntax': [
2,
'SwitchStatement',
// This is added by eslint-config-prettier, so we keep it
{
selector: 'SequenceExpression',
message:
"The comma operator is confusing and a common mistake. Don't use it!",
},
],
'no-duplicate-case': 2,
'default-case': 2,
'default-case-last': 2,
'no-fallthrough': 2,
'no-case-declarations': 2,
'unicorn/no-useless-switch-case': 2,
'unicorn/prefer-switch': 2,
'unicorn/switch-case-braces': 2,
// Labels
'no-labels': 2,
'no-unused-labels': 2,
'no-extra-label': 2,
'no-label-var': 2,
// Exceptions
'no-throw-literal': 2,
'unicorn/throw-new-error': 2,
'unicorn/prefer-type-error': 2,
'unicorn/error-message': 2,
'unicorn/catch-error-name': [2, { ignore: ['cause'] }],
'no-ex-assign': 2,
'no-useless-catch': 2,
'unicorn/prefer-optional-catch-binding': 2,
'no-unsafe-finally': 2,
'no-debugger': 2,
// Too strict
'fp/no-throw': 0,
// Recommends `error.name` being enumerable, which is incorrect
'unicorn/custom-error-definition': 0,
// Functions
'func-style': 2,
'prefer-arrow-functions/prefer-arrow-functions': [
2,
{ allowObjectProperties: true },
],
'no-func-assign': 2,
'func-names': [2, 'as-needed'],
'func-name-matching': [2, { considerPropertyDescriptor: true }],
'prefer-arrow-callback': [2, { allowNamedFunctions: true }],
// This rule encourages creating functions where it is not needed
'unicorn/no-array-callback-reference': 0,
'arrow-body-style': 2,
'unicorn/prefer-default-parameters': 2,
'no-dupe-args': 2,
'prefer-spread': 2,
'unicorn/prefer-spread': 2,
'unicorn/no-useless-spread': 2,
'prefer-rest-params': 2,
'fp/no-arguments': 2,
// We want rest parameters to allow passing around arguments unchanged
'fp/no-rest-parameters': 0,
'require-yield': 2,
'accessor-pairs': 2,
'grouped-accessor-pairs': [2, 'getBeforeSet'],
'getter-return': 2,
'no-setter-return': 2,
'fp/no-get-set': 2,
'fp/no-proxy': 2,
'no-useless-return': 2,
// Too strict
'consistent-return': 0,
'unicorn/consistent-function-scoping': 2,
'unicorn/prefer-reflect-apply': 2,
// Objects
'no-dupe-keys': 2,
// We sort object keys by type, not by name
'sort-keys': 0,
'no-useless-computed-key': 2,
'object-shorthand': 2,
'no-useless-rename': 2,
'unicorn/consistent-destructuring': 2,
// It conflicts with `prefer-destructuring` rule
'unicorn/no-unreadable-array-destructuring': 0,
'no-empty-pattern': 2,
'unicorn/no-object-as-default-parameter': 2,
'no-object-constructor': 2,
'no-unsafe-optional-chaining': [2, { disallowArithmeticOperators: true }],
'prefer-object-has-own': 2,
// Array.reduce() is sometimes useful in stateful logic
'unicorn/prefer-object-from-entries': 0,
// Inheritance
'constructor-super': 2,
'no-this-before-super': 2,
'no-constructor-return': 2,
'no-useless-call': 2,
'no-extra-bind': 2,
'consistent-this': 2,
'unicorn/no-this-assignment': 2,
'unicorn/no-static-only-class': 2,
'no-empty-static-block': 2,
// This forbids `func.bind()`
'unicorn/prefer-prototype-methods': 0,
'no-class-assign': 2,
'no-proto': 2,
'no-prototype-builtins': 2,
'no-extend-native': 2,
'no-unused-private-class-members': 2,
'max-classes-per-file': 0,
'fp/no-class': 2,
'fp/no-this': 2,
'unicorn/no-array-method-this-argument': 2,
// Arrays
'no-sparse-arrays': 2,
'array-callback-return': [2, { allowImplicit: true, checkForEach: true }],
'unicorn/prefer-includes': 2,
'unicorn/prefer-array-flat-map': 2,
'unicorn/prefer-array-flat': 2,
'unicorn/no-magic-array-flat-depth': 2,
// Array.reduce() is sometimes useful in stateful logic
'unicorn/no-array-reduce': 0,
'unicorn/prefer-negative-index': 2,
'unicorn/no-length-as-slice-end': 2,
'unicorn/prefer-array-find': 2,
'unicorn/prefer-array-some': 2,
'unicorn/prefer-array-index-of': 2,
'unicorn/consistent-existence-index-check': 2,
'unicorn/no-useless-length-check': 2,
// We prefer `forEach()` over loops
'unicorn/no-array-for-each': 0,
'unicorn/no-array-push-push': 2,
'unicorn/consistent-empty-array-spread': 2,
// `Array.from()` is slower than `new Array()` followed by a `for` loop
'unicorn/no-new-array': 0,
'unicorn/prefer-set-has': 2,
'unicorn/prefer-set-size': 2,
'unicorn/require-array-join-separator': 2,
// String
'no-multi-str': 2,
'no-useless-concat': 2,
'prefer-template': 2,
'no-template-curly-in-string': 2,
'unicorn/prefer-string-starts-ends-with': 2,
'unicorn/prefer-string-trim-start-end': 2,
'unicorn/prefer-string-slice': 2,
'unicorn/prefer-string-replace-all': 2,
'unicorn/prefer-at': 2,
'unicorn/no-hex-escape': 2,
'unicorn/escape-case': 2,
'unicorn/no-console-spaces': 2,
// Not useful at the moment
'unicorn/string-content': 0,
'unicorn/prefer-code-point': 2,
'unicorn/prefer-json-parse-buffer': 2,
'unicorn/text-encoding-identifier-case': 2,
// RegExps
'no-useless-escape': 2,
'unicorn/better-regex': 2,
'no-control-regex': 2,
// This is in conflict with no-useless-escape rule
'no-div-regex': 0,
'no-empty-character-class': 2,
'no-regex-spaces': 2,
'no-misleading-character-class': 2,
'no-useless-backreference': 2,
'no-invalid-regexp': 2,
'prefer-regex-literals': [2, { disallowRedundantWrapping: true }],
// Too verbose
'unicorn/prefer-string-raw': 0,
// TODO: use requireFlag 'v' after dropping Node <20.0.0
'require-unicode-regexp': 2,
// This makes RegExps more verbose
'prefer-named-capture-group': 0,
'unicorn/prefer-regexp-test': 2,
// Number
'unicorn/no-zero-fractions': 2,
'unicorn/numeric-separators-style': 2,
'no-octal': 2,
'no-octal-escape': 2,
'no-nonoctal-decimal-escape': 2,
'prefer-numeric-literals': 2,
radix: [2, 'as-needed'],
'unicorn/prefer-number-properties': [2, { checkInfinity: true }],
'use-isnan': [2, { enforceForIndexOf: true }],
'no-compare-neg-zero': 2,
'prefer-exponentiation-operator': 2,
'no-bitwise': 2,
'unicorn/prefer-math-trunc': 2,
'unicorn/prefer-math-min-max': 2,
'unicorn/prefer-modern-math-apis': 2,
'unicorn/require-number-to-fixed-digits-argument': 2,
// Symbol
'symbol-description': 2,
// Date
'unicorn/prefer-date-now': 2,
// Async
'n/handle-callback-err': [2, '^(err|error)$'],
'n/callback-return': 2,
'n/no-callback-literal': 2,
'no-promise-executor-return': 2,
'unicorn/no-single-promise-in-promise-methods': 2,
'unicorn/no-await-in-promise-methods': 2,
'no-await-in-loop': 2,
'unicorn/no-unnecessary-await': 2,
'no-async-promise-executor': 2,
'unicorn/no-useless-promise-resolve-reject': 2,
'unicorn/prefer-top-level-await': 2,
'unicorn/no-await-expression-member': 2,
'unicorn/no-thenable': 2,
'require-atomic-updates': 2,
'n/no-sync': 2,
'n/prefer-promises/fs': 2,
'n/prefer-promises/dns': 2,
'promise/catch-or-return': 2,
'promise/prefer-catch': 2,
'promise/always-return': 2,
'promise/param-names': 2,
'promise/valid-params': 2,
'promise/no-new-statics': 2,
// We want to allow Promise.all() and Promise.race()
'promise/no-native': 0,
'promise/no-return-wrap': 2,
'promise/no-return-in-finally': 2,
'promise/no-nesting': 2,
'promise/no-promise-in-callback': 2,
'promise/no-multiple-resolved': 2,
'promise/no-callback-in-promise': 2,
'promise/avoid-new': 2,
'promise/prefer-await-to-then': [2, { strict: true }],
'promise/prefer-await-to-callbacks': 2,
'promise/spec-only': 2,
// Modules
'import/no-unresolved': [2, { ignore: ['@ehmicky/eslint-config'] }],
'n/no-missing-require': 2,
'n/no-unpublished-require': 2,
'n/no-missing-import': [
2,
{ allowModules: ['@ehmicky/eslint-config'], ignoreTypeImport: true },
],
'n/no-unpublished-import': 2,
// TODO: there are two bugs that make this rule hard to work with at the moment
// - /~https://github.com/microsoft/vscode-eslint/issues/717
// - when renaming a file, an error popup shows up in VSCode
'import/no-unused-modules': 0,
'import/named': 2,
'import/default': 2,
'import/namespace': [2, { allowComputed: true }],
'import/no-named-as-default': 2,
'import/no-named-as-default-member': 2,
'unicorn/prefer-export-from': [2, { ignoreUsedVariables: true }],
// All core Node.js libraries should be imported using destructuring
'unicorn/import-style': [
2,
{ styles: importStyles, extendDefaultStyles: false },
],
'import/no-empty-named-blocks': 2,
'import/no-namespace': 2,
'import/no-named-default': 2,
// This does not match our import/export style
'import/no-named-export': 0,
'import/prefer-default-export': 0,
'import/no-anonymous-default-export': [
2,
{ allowObject: true, allowArray: true, allowLiteral: true },
],
// Better covered by `import/no-anonymous-default-export`
'unicorn/no-anonymous-default-export': 0,
'import/no-default-export': 2,
'n/exports-style': [2, 'module.exports'],
'n/no-exports-assign': 2,
'no-import-assign': 2,
'import/extensions': [2, 'always', { ignorePackages: true }],
'n/file-extension-in-import': 2,
'import/no-absolute-path': 2,
// This does not work with the way we import files
'import/no-internal-modules': 0,
'import/no-relative-parent-imports': 0,
'import/no-useless-path-segments': 2,
'import/no-relative-packages': 2,
'import/no-duplicates': 2,
'import/export': 2,
'import/no-self-import': 2,
'import/no-cycle': 2,
// This does not match our import/export style
'import/group-exports': 0,
// This does not allow excluding peerDependencies, so we only use
// n/no-extraneous-import
'import/no-extraneous-dependencies': 0,
'n/no-extraneous-require': [2, { allowModules: ['ava', 'tsd'] }],
'n/no-extraneous-import': [2, { allowModules: ['ava', 'tsd'] }],
'import/first': 2,
// This does not match our import/export style
'import/exports-last': 0,
'sort-imports': [
2,
{ ignoreMemberSort: true, ignoreDeclarationSort: true },
],
'n/no-mixed-requires': 2,
'import/order': [
2,
{
'newlines-between': 'always',
alphabetize: { order: 'asc', caseInsensitive: true },
warnOnUnassignedImports: true,
named: { enabled: true, types: 'types-last' },
},
],
'import/newline-after-import': 2,
'import/unambiguous': 2,
'n/global-require': 2,
'n/no-new-require': 2,
'import/no-dynamic-require': [2, { esmodule: true }],
'import/no-commonjs': 2,
'import/no-amd': 2,
'unicorn/prefer-module': 2,
'import/no-import-module-exports': 2,
'import/no-deprecated': 2,
'import/no-webpack-loader-syntax': 2,
// No use
'import/dynamic-import-chunkname': 0,
// No use
'import/no-restricted-paths': 0,
// Prefer @typescript-eslint/consistent-type-imports
'import/consistent-type-specifier-style': 0,
'unicorn/prefer-node-protocol': 2,
'n/prefer-node-protocol': 2,
'unicorn/relative-url-style': 2,
// Filenames
// Setting options to eslint-plugin-filenames does not work with ESLint 9
'filenames/match-regex': [2, '^[a-zA-Z_][a-zA-Z0-9_.]+$'],
'filenames/match-exported': [2, 'snake'],
'filenames/no-index': 2,
'unicorn/filename-case': [2, { case: 'snakeCase' }],
'unicorn/no-empty-file': 2,
// Binary
'n/no-unpublished-bin': 2,
// We are symlinking shebang files so that they have the correct
// file extension
'n/hashbang': 0,
// Compatibility
// Does not work when transpiling with Babel
'n/no-unsupported-features/es-syntax': 0,
'n/no-unsupported-features/es-builtins': 0,
'n/no-unsupported-features/node-builtins': 0,
'n/no-unsupported-features/node-globals': 0,
'n/no-deprecated-api': 2,
'unicorn/no-unnecessary-polyfills': 2,
'unicorn/prefer-global-this': 2,
// Denylist
// No use
'no-restricted-exports': 0,
// Already covered by no-restricted-imports
'n/no-restricted-require': 0,
'n/no-restricted-import': 0,
// Rules for client-side code only
'import/no-nodejs-modules': 0,
// No use
'no-restricted-properties': 0,
// Avoid Node.js-specific global variables
'no-restricted-globals': [
2,
...forbiddenGlobals,
// Use console wrapper instead
'console',
],
// To avoid
'unicorn/no-null': 2,
// `undefined` is too useful to avoid entirely
'fp/no-nil': 0,
'no-undefined': 0,
'unicorn/no-useless-undefined': 2,
'unicorn/no-typeof-undefined': 2,
'no-void': 2,
'no-with': 2,
'no-caller': 2,
'no-sequences': 2,
'no-continue': 2,
'no-iterator': 2,
'no-console': 2,
'fp/no-events': 2,
'no-eval': 2,
'no-new-func': 2,
'no-buffer-constructor': 2,
'unicorn/no-new-buffer': 2,
'n/no-path-concat': 0,
'n/no-process-env': 2,
'n/no-process-exit': 2,
'n/process-exit-as-throw': 2,
'unicorn/no-process-exit': 2,
'unicorn/prefer-structured-clone': 2,
'unicorn/no-invalid-fetch-options': 2,
'no-script-url': 2,
'no-alert': 2,
'unicorn/prefer-add-event-listener': 2,
'unicorn/no-invalid-remove-event-listener': 2,
'unicorn/prefer-event-target': 2,
'no-obj-calls': 2,
// DOM
'unicorn/prefer-query-selector': 2,
'unicorn/prefer-dom-node-append': 2,
'unicorn/prefer-dom-node-remove': 2,