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eslint.config.base.js
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import fs from 'node:fs';
import path from 'node:path';
import stylisticPlugin from '@stylistic/eslint-plugin-js';
import vitestPlugin from '@vitest/eslint-plugin';
import restrictedGlobals from 'confusing-browser-globals';
import importPlugin from 'eslint-plugin-import';
import jsxA11yPlugin from 'eslint-plugin-jsx-a11y';
import promisePlugin from 'eslint-plugin-promise';
import reactPlugin from 'eslint-plugin-react';
import reactHooksPlugin from 'eslint-plugin-react-hooks';
import regexpPlugin from 'eslint-plugin-regexp';
import simpleImportSortPlugin from 'eslint-plugin-simple-import-sort';
import storybookPlugin from 'eslint-plugin-storybook';
import testingLibraryPlugin from 'eslint-plugin-testing-library';
import unicornPlugin from 'eslint-plugin-unicorn';
import globals from 'globals';
import _ from 'lodash';
import tseslint from 'typescript-eslint';
const DEFAULT_OPTS = {
typescript: false,
react: false,
storybook: false,
vitest: false,
cypress: false,
reactTestingLibrary: false,
cypressTestingLibrary: false,
};
export function detectOpts(projectDir) {
const pkgPath = path.resolve(projectDir, './package.json');
const tsconfigPath = path.resolve(projectDir, './tsconfig.json');
const pkg = JSON.parse(fs.readFileSync(pkgPath));
const deps = new Set([
...Object.keys(pkg.dependencies || {}),
...Object.keys(pkg.devDependencies || {}),
]);
return {
typescript: deps.has('typescript') && fs.existsSync(tsconfigPath),
react: deps.has('react'),
storybook: deps.has('storybook'),
vitest: deps.has('vitest'),
cypress: deps.has('cypress'),
reactTestingLibrary: deps.has('@testing-library/react'),
cypressTestingLibrary: deps.has('@testing-library/cypress'),
};
}
// eslint-disable-next-line complexity
export function createConfig(opts = {}) {
const {
typescript: withTypeScript,
react: withReact,
storybook: withStorybook,
vitest: withVitest,
cypress: withCypress,
reactTestingLibrary: withReactTestingLibrary,
cypressTestingLibrary: withCypressTestingLibrary,
} = { ...DEFAULT_OPTS, ...opts };
return tseslint.config(
_.compact([
withTypeScript && {
/**
* Configure type-aware linting.
*
* To disable on a subset of files, see:
* https://typescript-eslint.io/getting-started/typed-linting#how-can-i-disable-type-aware-linting-for-a-subset-of-files
*/
name: 'h5web/defaults/languages-ts',
languageOptions: {
parserOptions: {
projectService: true,
tsconfigRootDir: import.meta.dirname,
},
},
},
withReact && {
/**
* Enable JSX parsing.
*/
name: 'h5web/defaults/languages-jsx',
files: ['**/*.{jsx,tsx}'],
languageOptions: {
parserOptions: {
ecmaFeatures: { jsx: true },
jsxPragma: null, // https://typescript-eslint.io/packages/parser/#jsxpragma
},
},
},
{
/**
* Configure browser globals on files we're confident aren't meant to run
* in a non-browser environment.
*/
name: 'h5web/defaults/globals-browser',
files: ['**/*.{jsx,tsx}'],
languageOptions: {
globals: { ...globals.browser },
},
},
{
/**
* ESLint core rules: https://eslint.org/docs/latest/rules/
*/
name: 'h5web/defaults/rules/core',
rules: {
'accessor-pairs': 'error',
'array-callback-return': [
'error',
{ checkForEach: true }, // enforce no return in `forEach`
],
// 'arrow-body-style': 'off', // use of curly braces in arrow functions should first be dictated by readabillity
// 'block-scoped-var': 'off', // useless with `no-var`
// camelcase: 'off', // too tedious to fix when dealing with back-end responses, external libs, etc.
// 'capitalized-comments': 'off', // too nitpicky
// 'class-methods-use-this': 'off', // too nitpicky
complexity: 'warn',
'consistent-return': 'error',
// 'consistent-this': 'off', // too nitpicky
'constructor-super': 'error',
curly: [
'warn',
'all', // curly braces are good for readability and help avoid silly bugs
],
'default-case': 'warn',
'default-case-last': 'error',
'default-param-last': 'warn',
'dot-notation': 'warn',
eqeqeq: 'warn',
'for-direction': 'error',
// 'func-name-matching': 'off', // arbitrary
'func-names': [
'warn',
'as-needed', // unnecessary function names add clutter
],
'func-style': [
'warn',
'declaration', // make functions stand out from variables
],
'getter-return': 'error',
'grouped-accessor-pairs': 'warn',
'guard-for-in': 'warn',
// 'id-denylist': 'off',
// 'id-length': 'off',
// 'id-match': 'off',
// 'init-declarations': 'off',
'logical-assignment-operators': [
'warn', // i.e. `||=`, `&&=`, `??=`
'never', // if re-assigning a variable is unavoidable, at least make the logic explicit
],
'max-classes-per-file': ['warn', 1],
'max-depth': 'warn',
// 'max-lines': 'off', // too arbitrary
// 'max-lines-per-function': 'off', // too arbitrary; prefer limiting complexity
// 'max-nested-callbacks': 'off', // `max-depth` is more generic
// 'max-params': 'off', // too arbitrary
// 'max-statements': 'off', // too arbitrary
'new-cap': 'warn',
'no-alert': 'warn',
'no-array-constructor': 'error',
'no-async-promise-executor': 'error',
'no-await-in-loop': 'warn', // promises should by parallelized (disable inline for legitimate cases)
'no-bitwise': 'error',
'no-caller': 'error',
'no-case-declarations': 'warn',
'no-class-assign': 'error',
'no-compare-neg-zero': 'error',
'no-cond-assign': 'error',
'no-console': 'warn',
'no-const-assign': 'error',
'no-constant-binary-expression': 'error',
'no-constant-condition': 'error',
'no-constructor-return': 'error',
'no-continue': 'warn',
'no-control-regex': 'error',
'no-debugger': 'warn',
'no-delete-var': 'error',
'no-div-regex': 'error',
'no-dupe-args': 'error',
'no-dupe-class-members': 'error',
'no-dupe-else-if': 'error',
'no-dupe-keys': 'error',
'no-duplicate-case': 'error',
// 'no-duplicate-imports': 'off', // replaced with `imports/no-duplicates`
'no-else-return': [
'warn',
{ allowElseIf: false }, // `else if` is unnecessary when all previous branch returns
],
'no-empty': 'warn',
'no-empty-character-class': 'error',
'no-empty-function': [
'warn', // insert "noop" comment (or equivalent) in function body if intentional
{ allow: ['arrowFunctions'] }, // often used as default values for callback parameters
],
'no-empty-pattern': 'warn',
'no-empty-static-block': 'warn',
// 'no-eq-null': 'off', // useless with `eqeqeq`
'no-eval': 'error',
'no-ex-assign': 'error',
'no-extend-native': 'error',
'no-extra-bind': 'warn',
'no-extra-boolean-cast': [
'warn',
{ enforceForInnerExpressions: true },
],
// 'no-extra-label': 'off', // useless with `no-labels`
'no-fallthrough': 'error',
'no-func-assign': 'error',
'no-global-assign': 'error',
'no-implicit-coercion': [
'warn',
{ allow: ['!!'] }, // allow only coercing to boolean with `!!`
],
'no-implicit-globals': 'error',
'no-implied-eval': 'error',
'no-import-assign': 'error',
// 'no-inline-comments': 'off', // inline comments are very handy...
'no-inner-declarations': [
'warn',
'functions',
{ blockScopedFunctions: 'disallow' }, // stricter stylistic choice (disable inline for legitimate cases)
],
'no-invalid-regexp': 'error',
'no-invalid-this': 'error',
'no-irregular-whitespace': 'warn',
'no-iterator': 'error',
// 'no-label-var': 'off', // useless with `no-labels`
'no-labels': 'error',
'no-lone-blocks': 'error',
// 'no-lonely-if': 'off',
'no-loop-func': 'error',
'no-loss-of-precision': 'error',
// 'no-magic-numbers': 'off', // impractical
'no-misleading-character-class': 'error',
'no-multi-assign': 'warn',
'no-multi-str': 'error',
// 'no-negated-condition': 'off', // sometimes more readable
// 'no-nested-ternary': 'off', // sometimes convenient
'no-new-func': 'error',
'no-new-native-nonconstructor': 'error',
'no-new-wrappers': 'error',
'no-new': 'warn',
'no-nonoctal-decimal-escape': 'error',
'no-obj-calls': 'error',
'no-object-constructor': 'error',
'no-octal-escape': 'error',
'no-octal': 'error',
'no-param-reassign': [
'warn',
{ props: true }, // disallow mutating function parameters
],
// 'no-plusplus': 'off', // risk obsolete with Prettier configured with `semi: true` (default)
'no-promise-executor-return': 'error',
'no-proto': 'error',
'no-prototype-builtins': 'error',
// 'no-redeclare': 'off', // useless with `no-var`
'no-regex-spaces': 'error',
// 'no-restricted-exports': 'off',
'no-restricted-globals': [
'error', // access globals explicitly via `window`, `self`, etc.
...restrictedGlobals, // https://github.com/facebook/create-react-app/blob/main/packages/confusing-browser-globals/index.js
],
// 'no-restricted-imports': 'off',
// 'no-restricted-properties': 'off',
// 'no-restricted-syntax': 'off',
'no-return-assign': 'error',
'no-script-url': 'error',
'no-self-assign': 'error',
'no-self-compare': 'error',
'no-sequences': 'error',
'no-setter-return': 'error',
'no-shadow-restricted-names': 'error',
'no-shadow': 'warn',
'no-sparse-arrays': 'error',
'no-template-curly-in-string': 'warn',
// 'no-ternary': 'off', // hmm, no thank you
'no-this-before-super': 'error',
'no-throw-literal': 'error',
'no-undef-init': 'warn',
'no-undef': 'error',
// 'no-undefined': 'off', // already enforced by `no-shadow-restricted-names`
// 'no-underscore-dangle': 'off', // not worth arguing about
'no-unexpected-multiline': 'warn',
'no-unmodified-loop-condition': 'error',
'no-unneeded-ternary': 'warn',
'no-unreachable-loop': 'warn',
'no-unreachable': 'error',
'no-unsafe-finally': 'error',
'no-unsafe-negation': 'error',
'no-unsafe-optional-chaining': [
'error',
{ disallowArithmeticOperators: true }, // prevent implicit type coercion of `undefined`
],
'no-unused-expressions': 'warn',
// 'no-unused-labels': 'off', // useless with `no-labels`
'no-unused-private-class-members': 'warn',
'no-unused-vars': [
'warn',
{
args: 'all', // report all unused arguments
argsIgnorePattern: '^_', // unless they are specifically prefixed with an underscore
ignoreRestSiblings: true, // allow using destructuring to remove properties from objects
},
],
// 'no-use-before-define': 'off',
// 'no-useless-assignment': 'off', // false positives in JSX (and already covered by TypeScript)
'no-useless-backreference': 'error',
'no-useless-call': 'error',
'no-useless-catch': 'warn',
'no-useless-computed-key': 'warn',
'no-useless-concat': 'warn',
'no-useless-constructor': 'warn',
'no-useless-escape': 'warn',
'no-useless-rename': 'warn',
'no-useless-return': 'warn',
'no-var': 'error',
'no-void': [
'warn',
{ allowAsStatement: true }, // useful to identify promises that don't need to be chained/awaited
],
// 'no-warning-comments': 'off',
'no-with': 'error',
'object-shorthand': 'warn', // `{ a }` rather than `{ a: a }`
'one-var': ['warn', 'never'], // disallow combining variable declarations - e.g. `const a = 1, b = 2;`
'operator-assignment': ['warn', 'always'], // `x += y` rather than `x = x + y`
'prefer-arrow-callback': 'warn',
'prefer-const': 'warn',
'prefer-destructuring': 'warn',
'prefer-exponentiation-operator': 'warn',
// 'prefer-named-capture-group': 'off', // lacks browser support
'prefer-numeric-literals': 'warn',
'prefer-object-has-own': 'warn',
'prefer-object-spread': 'warn',
'prefer-promise-reject-errors': 'error',
'prefer-regex-literals': 'error',
'prefer-rest-params': 'error',
'prefer-spread': 'error',
'prefer-template': 'warn',
'require-atomic-updates': 'warn',
// 'require-await': 'off', // making a synchronous function `async` intentionally is perfectly fine
// 'require-unicode-regexp': 'off', // replaced with `regexp/require-unicode-regexp`
'require-yield': 'error',
// 'sort-imports': 'off', // prefer `simple-import-sort/imports`
// 'sort-keys': 'off',
// 'sort-vars': 'off',
'symbol-description': 'warn',
// 'unicode-bom': 'off', // handled by Prettier
// 'use-isnan': 'off', // replaced with `unicorn/prefer-number-properties`
'valid-typeof': 'error',
// 'vars-on-top': 'off', // useless with `no-var`
// radix: 'off', // obsolete since ES5
strict: 'error',
yoda: 'warn',
},
},
withTypeScript && {
/**
* ESLint core rules on TS/TSX files.
* Turn off rules made obsolete by TypeScript or with better alternatives in TypeScript plugin.
*/
name: 'h5web/defaults/rules-ts/core',
files: ['**/*.{ts,tsx}'],
rules: {
'default-case': 'off',
'default-param-last': 'off', // replaced with `@typescript-eslint/default-param-last`
'no-loop-func': 'off', // replaced with `@typescript-eslint/no-loop-func`
'no-shadow': 'off', // replaced with `@typescript-eslint/no-shadow`
'prefer-destructuring': 'off', // replaced with `@typescript-eslint/prefer-destructuring`
},
},
withReact && {
/**
* ESLint core rules on JSX/TSX files.
* Configure specific rules to support/check JSX syntax.
*/
name: 'h5web/defaults/rules-jsx/core',
files: ['**/*.{jsx,tsx}'],
rules: {
'no-unused-expressions': ['warn', { enforceForJSX: true }],
},
},
{
/**
* Promise plugin: https://github.com/eslint-community/eslint-plugin-promise
* Promote use of `async/await` but enforce promise chaining rules as
* fallback in case of local opt-out.
*/
name: 'h5web/defaults/rules/promise',
plugins: { promise: promisePlugin },
rules: {
'promise/always-return': 'error',
// 'promise/avoid-new': 'off', // allow `new Promise()` syntax
'promise/catch-or-return': 'error',
'promise/no-callback-in-promise': 'warn',
'promise/no-multiple-resolved': 'warn',
// 'promise/no-native': 'off', // obsolete
'promise/no-nesting': 'warn',
'promise/no-new-statics': 'error',
'promise/no-promise-in-callback': 'warn',
'promise/no-return-in-finally': 'warn',
'promise/no-return-wrap': 'error',
'promise/param-names': 'warn',
'promise/prefer-await-to-callbacks': 'warn',
'promise/prefer-await-to-then': [
'error', // `async/await` is a must!
{ strict: true }, // disallow `await promise.then()`
],
'promise/prefer-catch': 'warn',
'promise/spec-only': 'error',
'promise/valid-params': 'error',
},
},
withTypeScript && {
/**
* Promise plugin on TS/TSX files.
* Turn off rules that TypeScript can report.
*/
name: 'h5web/defaults/rules-ts/promise',
files: ['**/*.{ts,tsx}'],
rules: {
'promise/valid-params': 'off',
},
},
{
/**
* Regexp plugin: https://ota-meshi.github.io/eslint-plugin-regexp/rules/
* Use recommended configuration, and then tweak.
*/
name: 'h5web/defaults/rules/regexp',
plugins: { regexp: regexpPlugin },
rules: {
...regexpPlugin.configs['flat/recommended'].rules,
'regexp/grapheme-string-literal': 'warn',
'regexp/hexadecimal-escape': 'warn',
'regexp/letter-case': 'warn',
'regexp/no-control-character': 'error', // complements `no-control-regex`
'regexp/no-octal': 'error',
'regexp/no-standalone-backslash': 'error',
'regexp/no-super-linear-move': 'error', // protects from regex DoS
'regexp/prefer-escape-replacement-dollar-char': 'warn',
'regexp/require-unicode-regexp': 'warn',
'regexp/sort-alternatives': 'warn',
'regexp/sort-character-class-elements': 'warn',
'regexp/sort-flags': 'warn', // downgrade
},
},
{
/**
* Regexp plugin on test/Cypress files
*/
name: 'h5web/defaults/rules-test/regexp',
files: [
'**/__tests__/**/*.{js,jsx,ts,tsx}',
'**/*.test.{js,jsx,ts,tsx}',
'cypress/**/*.ts',
],
rules: {
'regexp/require-unicode-regexp': 'off', // futile in tests
},
},
{
/**
* Stylistic plugin: https://eslint.style/
* Minor formatting tweaks to complement Prettier.
*/
name: 'h5web/defaults/rules/stylistic-js',
plugins: { '@stylistic/js': stylisticPlugin },
rules: {
'@stylistic/js/spaced-comment': [
'warn',
'always', // force space after `//` and `/*`, and before `*/`
],
},
},
{
/**
* Stylistic plugin on TS declaration files.
*/
name: 'h5web/defaults/rules-dts/stylistic-js',
files: ['**/*.d.ts'],
rules: {
'@stylistic/js/spaced-comment': [
'warn',
'always',
{ line: { markers: ['/'] } }, // allow triple slash directives
],
},
},
{
/**
* Import plugin: https://github.com/import-js/eslint-plugin-import
* - Assume ESM (`"type": "module"` in `package.json`)
* - Disable slow rules: https://typescript-eslint.io/troubleshooting/typed-linting/performance/#eslint-plugin-import
*/
name: 'h5web/defaults/rules/import',
plugins: { import: importPlugin },
rules: {
'import/consistent-type-specifier-style': [
'warn',
'prefer-inline', // `import { type Foo } from 'foo';`
],
'import/default': 'error',
// 'import/dynamic-import-chunkname': 'off', // bundler-specific
'import/export': 'error',
// 'import/exports-last': 'off', // can move related pieces of code far apart from one another
// 'import/extensions': 'off', // project-specific
'import/first': 'warn', // move all imports to the top
// 'import/group-exports': 'off', // can move related pieces of code far apart from one another
// 'import/max-dependencies': 'off', // arbitrary
// 'import/named': 'off', // too slow even when applied only to a few JS files
// 'import/namespace': 'off', // too slow even when applied only to a few JS files
'import/newline-after-import': 'warn',
// 'import/no-absolute-path': 'off', // project-specific
'import/no-amd': 'error',
'import/no-anonymous-default-export': 'warn', // good for IntelliSense, `console.log` debugging, etc.
'import/no-commonjs': 'error', // only allowed in CJS files
// 'import/no-cycle': 'off', // way too slow!
// 'import/no-default-export': 'off', // common practice in React projects
// 'import/no-deprecated': 'off', // too slow even when applied only to a few JS files; cf. also `@typescript-eslint/no-deprecated`
'import/no-duplicates': [
'warn',
{
considerQueryString: true, // e.g. `?worker`
'prefer-inline': true, // for compatibility with TypeScript's inline `type` imports
},
],
// 'import/no-dynamic-require': 'off', // CommonJS
// 'import/no-empty-named-blocks': 'off',
// 'import/no-extraneous-dependencies': 'off',
// 'import/no-import-module-exports': 'off', // CommonJS
// 'import/no-internal-modules': 'off', // project-specific
'import/no-mutable-exports': 'error',
'import/no-named-as-default': 'error',
'import/no-named-default': 'warn',
'import/no-named-as-default-member': 'error',
// 'import/no-named-export': 'off',
'import/no-namespace': 'warn', // namespaces make it difficult to find unused code, rename exports, etc.
// 'import/no-nodejs-modules': 'off', // project-specific
// 'import/no-relative-packages': 'off', // project-specific
// 'import/no-relative-parent-imports': 'off', // project-specific
// 'import/no-restricted-paths': 'off', // project-specific
'import/no-self-import': 'error',
// 'import/no-unassigned-import': 'off', // project-specific
// 'import/no-unresolved': 'off', // slow, false positives
'import/no-unused-modules': 'warn',
'import/no-useless-path-segments': 'warn',
// 'import/no-webpack-loader-syntax': 'off', // bundler-specific
// 'import/order': 'off', // prefer `simple-import-sort/imports`
// 'import/prefer-default-export': 'off', // project-specific
// 'import/unambiguous': 'off',
},
},
{
/**
* Import plugin on CJS files.
* Expect CommonJS module system in `.cjs` files.
*/
name: 'h5web/defaults/rules-cjs/import',
files: ['**/*.cjs'],
rules: {
'import/no-commonjs': 'off',
'import/no-cycle': 'off', // not supported
'import/no-dynamic-require': 'error', // allow explicitly when needed
'import/no-import-module-exports': 'error',
'import/no-unresolved': ['error', { commonjs: true }],
'import/no-useless-path-segments': ['warn', { commonjs: true }],
},
},
withTypeScript && {
/**
* Import plugin on TS/TSX files.
* Turn off rules that TypeScript can report.
*/
name: 'h5web/defaults/rules-ts/import',
files: ['**/*.{ts,tsx}'],
rules: {
'import/default': 'off',
'import/no-named-as-default-member': 'off',
'import/no-unresolved': 'off',
},
},
{
/**
* Simple Import Sort plugin: https://github.com/lydell/eslint-plugin-simple-import-sort
* Prefer this plugin over ESLint's `sort-imports` to avoid debating exact
* sorting order (i.e. Prettier philosophy).
*/
name: 'h5web/defaults/rules/import-sort',
plugins: { 'simple-import-sort': simpleImportSortPlugin },
rules: {
'simple-import-sort/imports': 'warn', // crucial for consistency and to reduce noise in diffs
// 'simple-import-sort/exports': 'off', // exports order often matters for readability/documentation
},
},
{
/**
* Unicorn plugin: https://github.com/sindresorhus/eslint-plugin-unicorn
*/
name: 'h5web/defaults/rules/unicorn',
languageOptions: { globals: globals.builtin },
plugins: { unicorn: unicornPlugin },
rules: {
'unicorn/better-regex': 'warn',
'unicorn/catch-error-name': 'warn',
// 'unicorn/consistent-destructuring': 'off', // false positives after type narrowing - e.g. `isDataset(entity) && entity.chunks`
'unicorn/consistent-empty-array-spread': 'warn',
'unicorn/consistent-existence-index-check': 'warn',
'unicorn/consistent-function-scoping': 'warn',
'unicorn/custom-error-definition': 'warn',
// 'unicorn/empty-brace-spaces': 'off', // handled by Prettier
'unicorn/error-message': 'warn',
'unicorn/escape-case': 'warn',
// 'unicorn/expiring-todo-comments': 'off', // project-specific
'unicorn/explicit-length-check': 'warn',
// 'unicorn/filename-case': 'off', // would need more fine-grained control
// 'unicorn/import-style': 'off', // project-specific
'unicorn/new-for-builtins': 'warn',
'unicorn/no-abusive-eslint-disable': 'warn',
'unicorn/no-anonymous-default-export': 'warn',
// 'unicorn/no-array-callback-reference': 'off', // too convenient to pass up on
// 'unicorn/no-array-for-each': 'off', // `forEach` is sometimes more concise
'unicorn/no-array-method-this-argument': 'error',
'unicorn/no-array-push-push': 'warn',
// 'unicorn/no-array-reduce': 'off', // too opinionated
'unicorn/no-await-expression-member': 'warn',
'unicorn/no-await-in-promise-methods': 'error',
'unicorn/no-console-spaces': 'warn',
'unicorn/no-document-cookie': 'warn',
'unicorn/no-empty-file': 'warn',
'unicorn/no-for-loop': 'warn',
'unicorn/no-hex-escape': 'warn',
'unicorn/no-instanceof-array': 'warn',
'unicorn/no-invalid-fetch-options': 'error',
'unicorn/no-invalid-remove-event-listener': 'error',
// 'unicorn/no-keyword-prefix': 'off', // keywords stand out with syntax highlighting
'unicorn/no-length-as-slice-end': 'warn',
'unicorn/no-lonely-if': 'warn',
// 'unicorn/no-magic-array-flat-depth': 'off',
// 'unicorn/no-negated-condition': 'off', // sometimes more readable
'unicorn/no-negation-in-equality-check': 'warn',
// 'unicorn/no-nested-ternary': 'off', // sometimes convenient; Prettier provides decent formatting
'unicorn/no-new-array': 'warn',
'unicorn/no-new-buffer': 'warn',
// 'unicorn/no-null': 'off', // `null` declares "active absence"
'unicorn/no-object-as-default-parameter': 'warn',
'unicorn/no-process-exit': 'warn',
'unicorn/no-single-promise-in-promise-methods': 'warn',
'unicorn/no-static-only-class': 'warn',
'unicorn/no-thenable': 'warn',
'unicorn/no-this-assignment': 'warn',
'unicorn/no-typeof-undefined': 'warn',
'unicorn/no-unnecessary-await': 'warn',
// 'unicorn/no-unnecessary-polyfills': 'off', // project-specific
'unicorn/no-unreadable-array-destructuring': 'warn',
'unicorn/no-unreadable-iife': 'warn',
'unicorn/no-unused-properties': 'warn',
'unicorn/no-useless-fallback-in-spread': 'warn',
'unicorn/no-useless-length-check': 'warn',
'unicorn/no-useless-promise-resolve-reject': 'warn',
'unicorn/no-useless-spread': 'warn',
'unicorn/no-useless-switch-case': 'warn',
// 'unicorn/no-useless-undefined': 'off', // prefer explicitness
'unicorn/no-zero-fractions': 'warn',
// 'unicorn/number-literal-case': 'off', // handled by Prettier
'unicorn/numeric-separators-style': 'warn',
'unicorn/prefer-add-event-listener': 'warn',
'unicorn/prefer-array-find': 'warn',
'unicorn/prefer-array-flat-map': 'warn',
'unicorn/prefer-array-flat': 'warn',
'unicorn/prefer-array-index-of': 'warn',
'unicorn/prefer-array-some': 'warn',
// 'unicorn/prefer-at': 'off', // poor browser support
'unicorn/prefer-blob-reading-methods': 'warn',
'unicorn/prefer-code-point': 'warn',
'unicorn/prefer-date-now': 'warn',
'unicorn/prefer-default-parameters': 'warn',
'unicorn/prefer-dom-node-append': 'warn',
'unicorn/prefer-dom-node-dataset': 'warn',
'unicorn/prefer-dom-node-remove': 'warn',
'unicorn/prefer-dom-node-text-content': 'warn',
'unicorn/prefer-event-target': 'warn',
'unicorn/prefer-export-from': 'warn',
'unicorn/prefer-global-this': 'warn',
'unicorn/prefer-includes': 'warn',
'unicorn/prefer-json-parse-buffer': 'warn',
'unicorn/prefer-keyboard-event-key': 'warn',
'unicorn/prefer-logical-operator-over-ternary': 'warn',
'unicorn/prefer-math-min-max': 'warn',
'unicorn/prefer-math-trunc': 'warn',
'unicorn/prefer-modern-dom-apis': 'warn',
'unicorn/prefer-modern-math-apis': 'warn',
'unicorn/prefer-module': 'warn',
'unicorn/prefer-native-coercion-functions': 'warn',
'unicorn/prefer-negative-index': 'warn',
'unicorn/prefer-node-protocol': 'warn',
'unicorn/prefer-number-properties': [
'warn',
{ checkInfinity: false }, // `Number.POSITIVE_INFINITY` is too verbose
],
'unicorn/prefer-object-from-entries': 'warn',
'unicorn/prefer-optional-catch-binding': 'warn',
'unicorn/prefer-prototype-methods': 'warn',
// 'unicorn/prefer-query-selector': 'off', // `getElementById` is simpler
'unicorn/prefer-reflect-apply': 'warn',
'unicorn/prefer-regexp-test': 'warn',
'unicorn/prefer-set-has': 'warn',
'unicorn/prefer-set-size': 'warn',
'unicorn/prefer-spread': 'warn',
'unicorn/prefer-string-raw': 'warn',
'unicorn/prefer-string-replace-all': 'warn',
'unicorn/prefer-string-slice': 'warn',
// 'unicorn/prefer-string-starts-ends-with': 'off', // replaced with `@typescript-eslint/prefer-string-starts-ends-with`
'unicorn/prefer-string-trim-start-end': 'warn',
// 'unicorn/prefer-structured-clone': 'off', // poor browser support
'unicorn/prefer-switch': 'warn',
// 'unicorn/prefer-ternary': 'off', // there's such a thing as ternary overuse...
// 'unicorn/prefer-top-level-await': 'off', // difficult to detect if supported
'unicorn/prefer-type-error': 'warn',
// 'unicorn/prevent-abbreviations': 'off', // way too opinionated
'unicorn/relative-url-style': 'warn',
'unicorn/require-array-join-separator': 'warn',
'unicorn/require-number-to-fixed-digits-argument': 'warn',
'unicorn/require-post-message-target-origin': 'warn',
// 'unicorn/string-content': 'off', // project-specific
'unicorn/switch-case-braces': ['warn', 'avoid'], // `switch` should be less verbose than if/else if/else
'unicorn/template-indent': 'warn',
// 'unicorn/text-encoding-identifier-case': 'off', // false positives
'unicorn/throw-new-error': 'warn',
},
},
withTypeScript && {
/**
* Unicorn plugin on TS/TSX files.
* Turn off rules made obsolete by TypeScript.
*/
name: 'h5web/defaults/rules-ts/unicorn',
files: ['**/*.{ts,tsx}'],
rules: {
'unicorn/no-unnecessary-await': 'off',
},
},
withCypress && {
/**
* Unicorn plugin on Cypress files.
*/
name: 'h5web/defaults/rules-cypress/unicorn',
files: ['cypress/**/*.ts'],
rules: {
'unicorn/numeric-separators-style': 'off', // not supported
},
},
withTypeScript && {
/**
* TypeScript plugin: https://typescript-eslint.io/rules/
* Use both `strictTypeChecked` and stylisticTypeChecked` configs, and then tweak.
*/
name: 'h5web/defaults/rules-ts/typescript',
extends: [
tseslint.configs.strictTypeChecked,
tseslint.configs.stylisticTypeChecked,
],
rules: {
'@typescript-eslint/ban-ts-comment': [
'error',
{
'ts-expect-error': 'allow-with-description', // allow explicitly disabling errors
'ts-ignore': true,
'ts-nocheck': true,
},
],
'@typescript-eslint/consistent-indexed-object-style': 'warn', // downgrade
'@typescript-eslint/consistent-type-assertions': [
'error',
{
arrayLiteralTypeAssertions: 'allow-as-parameter', // prefer `const x: T[] = [ ... ];` to `const x = [ ... ] as T[];`
objectLiteralTypeAssertions: 'allow-as-parameter', // prefer `const x: T = { ... };` to `const x = { ... } as T;`
},
],
'@typescript-eslint/consistent-type-exports': 'warn',
'@typescript-eslint/consistent-type-imports': [
// Prefer this rule to TypeScript's `verbatimModuleSyntax` option
// https://typescript-eslint.io/rules/consistent-type-imports/#comparison-with-importsnotusedasvalues--verbatimmodulesyntax
'warn',
{
disallowTypeAnnotations: true,
fixStyle: 'inline-type-imports', // `import { type Foo } from 'foo';`
prefer: 'type-imports',
},
],
'@typescript-eslint/default-param-last': 'error',
'@typescript-eslint/explicit-member-accessibility': 'warn',
'@typescript-eslint/explicit-module-boundary-types': 'warn',
'@typescript-eslint/member-ordering': 'warn',
'@typescript-eslint/method-signature-style': 'warn',
'@typescript-eslint/no-confusing-void-expression': [
'warn',
{ ignoreArrowShorthand: true },
],
'@typescript-eslint/no-empty-function': [
'warn', // insert "noop" comment (or equivalent) in function body if intentional
{ allow: ['arrowFunctions'] }, // often used as default values for callback parameters
],
'@typescript-eslint/no-empty-object-type': [
'error',
{ allowInterfaces: 'always' }, // empty interfaces don't have the same downside as the empty object type `{}`
],
'@typescript-eslint/no-loop-func': 'error',
'@typescript-eslint/no-shadow': 'warn',
'@typescript-eslint/no-unnecessary-boolean-literal-compare': [
'warn',
{
allowComparingNullableBooleansToFalse: false,
allowComparingNullableBooleansToTrue: false,
},
],
'@typescript-eslint/no-unnecessary-condition': 'warn', // false positives due to not enabling `noUncheckedIndexedAccess` can be disabled inline
'@typescript-eslint/no-unnecessary-parameter-property-assignment':
'warn',
'@typescript-eslint/no-unnecessary-qualifier': 'warn',
'@typescript-eslint/no-unnecessary-type-arguments': 'warn', // downgrade
'@typescript-eslint/no-unsafe-argument': 'warn',
'@typescript-eslint/no-unsafe-assignment': 'off', // too tricky to fix when `any` is declared externally (JSON.parse, Array.isArray, etc.)
'@typescript-eslint/no-unused-vars': [
'warn', // downgrade
{
args: 'all', // report all unused arguments
argsIgnorePattern: '^_', // unless they are specifically prefixed with an underscore
ignoreRestSiblings: true, // allow using destructuring to remove properties from objects
},
],
'@typescript-eslint/no-useless-empty-export': 'error',
'@typescript-eslint/parameter-properties': [
'warn',
{ prefer: 'parameter-property' }, // e.g. `constructor(public readonly name: string) {}`
],
'@typescript-eslint/prefer-destructuring': 'warn',
'@typescript-eslint/prefer-enum-initializers': 'error',
'@typescript-eslint/prefer-nullish-coalescing': 'off', // `??` not supported before FF 72
'@typescript-eslint/prefer-readonly': 'error',
'@typescript-eslint/prefer-regexp-exec': 'off', // handled by `regexp/prefer-regexp-exec`
'@typescript-eslint/promise-function-async': 'error',
'@typescript-eslint/require-array-sort-compare': 'error',
'@typescript-eslint/require-await': 'off', // making a synchronous function `async` intentionally is perfectly fine
'@typescript-eslint/restrict-template-expressions': [
'error',
{ allowNumber: true },
],
},
},
withTypeScript && {
/**
* TypeScript plugin on JS/JSX/CJS files
* Disable some TS rules that could cause issues in JS files.
*/
name: 'h5web/defaults/rules-js/typescript',
files: ['**/*.{js,jsx,cjs}'],
rules: {
'@typescript-eslint/explicit-member-accessibility': 'off',
'@typescript-eslint/explicit-module-boundary-types': 'off',
'@typescript-eslint/no-unsafe-argument': 'off',
'@typescript-eslint/no-unsafe-assignment': 'off',
'@typescript-eslint/no-unsafe-call': 'off',
'@typescript-eslint/no-unsafe-member-access': 'off',
'@typescript-eslint/no-unsafe-return': 'off',
},
},
withTypeScript && {
/**
* TypeScript plugin on JSX/TSX files.
*/
name: 'h5web/defaults/rules-jsx/typescript',
files: ['**/*.{jsx,tsx}'],
rules: {
'@typescript-eslint/explicit-module-boundary-types': 'off', // affects readability of React components
},
},
withReact && {
/**
* React plugin: https://github.com/jsx-eslint/eslint-plugin-react
*/
name: 'h5web/defaults/rules-jsx/react',
plugins: { react: reactPlugin },
settings: { react: { version: 'detect' } },
rules: {
// 'react/boolean-prop-naming': 'off',
'react/button-has-type': 'warn',
'react/checked-requires-onchange-or-readonly': 'warn',
'react/default-props-match-prop-types': 'error',
'react/destructuring-assignment': 'warn',
'react/display-name': 'warn',
// 'react/forbid-component-props': 'off', // project-specific
// 'react/forbid-dom-props': 'off', // project-specific
// 'react/forbid-elements': 'off', // project-specific
// 'react/forbid-foreign-prop-types': 'off', // obsolete
// 'react/forbid-prop-types': 'error', // project-specific
'react/forward-ref-uses-ref': 'error',
'react/function-component-definition': [
'warn',
{
namedComponents: 'function-declaration', // `function Foo() { return <div />; }`
unnamedComponents: 'arrow-function', // `() => { return <div />; }`
},
],
// 'react/hook-use-state': 'off', // too restrictive
'react/iframe-missing-sandbox': 'error',
'react/jsx-boolean-value': 'warn',
// 'react/jsx-child-element-spacing': 'off', // Prettier
// 'react/jsx-closing-bracket-location': 'off', // Prettier
// 'react/jsx-closing-tag-location': 'off', // Prettier
'react/jsx-curly-brace-presence': ['warn', 'never'], // remove curly braces when not needed
// 'react/jsx-curly-newline': 'off', // Prettier
// 'react/jsx-curly-spacing': 'off', // Prettier
// 'react/jsx-equals-spacing': 'off', // Prettier
'react/jsx-filename-extension': [
'warn',
{
allow: 'always', // allow components without JSX to have JSX/TSX extension
extensions: ['.jsx', '.tsx'],
ignoreFilesWithoutCode: true,
},
],
// 'react/jsx-first-prop-new-line': 'off', // Prettier
'react/jsx-fragments': ['warn', 'syntax'], // prefer `<></>` over `<Fragment></Fragment>` (except with `key`)
// 'react/jsx-handler-names': 'off', // too restrictive
// 'react/jsx-indent': 'off', // Prettier
// 'react/jsx-indent-props': 'off', // Prettier
'react/jsx-key': [
'error',
{
checkFragmentShorthand: true,
checkKeyMustBeforeSpread: true,
warnOnDuplicates: true,
},
],
// 'react/jsx-max-depth': 'off', // arbitrary
// 'react/jsx-max-props-per-line': 'off', // Prettier
// 'react/jsx-newline': 'off', // Prettier
// 'react/jsx-no-bind': 'off', // premature optimisation
'react/jsx-no-comment-textnodes': 'error',
// 'react/jsx-no-constructed-context-values': 'off', // premature optimisation
'react/jsx-no-duplicate-props': 'error',
'react/jsx-no-leaked-render': 'error', // disabled later on TS files
// 'react/jsx-no-literals': 'off', // absurd
'react/jsx-no-script-url': 'error',
// 'react/jsx-no-target-blank': 'off', // obsolete with modern browsers
'react/jsx-no-undef': 'error',
'react/jsx-no-useless-fragment': 'warn',
// 'react/jsx-one-expression-per-line': 'off', // Prettier
'react/jsx-pascal-case': 'error',
// 'react/jsx-props-no-multi-spaces': 'off', // Prettier
'react/jsx-props-no-spread-multi': 'error',
// 'react/jsx-props-no-spreading': 'off', // too restrictive
// 'react/jsx-sort-default-props': 'off',
// 'react/jsx-sort-props': 'off',
// 'react/jsx-space-before-closing': 'off', // Prettier
// 'react/jsx-tag-spacing': 'off', // Prettier
// 'react/jsx-uses-react': 'off', // importing React in every file shouldn't be required with modern bundlers
'react/jsx-uses-vars': 'warn', // for `no-unused-vars` and `@typescript-eslint/no-unused-vars` to not report variables used in JSX/TSX
// 'react/jsx-wrap-multilines': 'off', // Prettier
'react/no-access-state-in-setstate': 'error',
// 'react/no-adjacent-inline-elements': 'off', // arbitrary
'react/no-array-index-key': 'warn', // disable inline as needed
'react/no-arrow-function-lifecycle': 'error',
'react/no-children-prop': 'error',
// 'react/no-danger': 'off', // React's API gives sufficient warning
'react/no-danger-with-children': 'error',
'react/no-deprecated': 'error',
'react/no-did-mount-set-state': 'warn',
'react/no-did-update-set-state': 'error',
'react/no-direct-mutation-state': 'error',
'react/no-find-dom-node': 'error',
'react/no-invalid-html-attribute': 'error', // check value of `rel` attribute is allowed
'react/no-is-mounted': 'error',
'react/no-multi-comp': 'warn',
'react/no-namespace': 'error',
// 'react/no-object-type-as-default-prop': 'off', // premature optimisation
'react/no-redundant-should-component-update': 'error',
'react/no-render-return-value': 'error',
// 'react/no-set-state': 'off', // absurd
'react/no-string-refs': 'error',
'react/no-this-in-sfc': 'error',
'react/no-typos': 'error',
// 'react/no-unescaped-entities': 'off', // Prettier probably sufficient to spot these typos
'react/no-unknown-property': 'error', // configure `ignore` setting if need be
'react/no-unsafe': 'error',
'react/no-unstable-nested-components': 'error',
'react/no-unused-class-component-methods': 'warn',
'react/no-unused-prop-types': 'warn',
'react/no-unused-state': 'warn',
'react/no-will-update-set-state': 'error',
'react/prefer-es6-class': 'error',
'react/prefer-exact-props': 'error',
// 'react/prefer-read-only-props': 'off', // too restrictive
'react/prefer-stateless-function': 'warn',
'react/prop-types': 'warn',