import url from "node:url"; import { fixupPluginRules } from "@eslint/compat"; import { FlatCompat } from "@eslint/eslintrc"; import eslintPluginJs from "@eslint/js"; import eslintPluginStylisticJs from "@stylistic/eslint-plugin-js"; import eslintPluginTypescriptEslint from "@typescript-eslint/eslint-plugin"; import { isCI } from "ci-info"; import eslintConfigPrettier from "eslint-config-prettier"; import eslintPluginImport from "eslint-plugin-import"; import eslintPluginJest from "eslint-plugin-jest"; import eslintPluginN from "eslint-plugin-n"; import eslintPluginReactConfigRecommended from "eslint-plugin-react/configs/recommended.js"; import eslintPluginRegexp from "eslint-plugin-regexp"; import eslintPluginSimpleImportSort from "eslint-plugin-simple-import-sort"; import eslintPluginUnicorn from "eslint-plugin-unicorn"; import eslintPluginPrettierInternalRules from "./scripts/tools/eslint-plugin-prettier-internal-rules/index.js"; const toPath = (file) => url.fileURLToPath(new URL(file, import.meta.url)); const compat = new FlatCompat({ baseDirectory: toPath("./") }); eslintPluginReactConfigRecommended.plugins.react = fixupPluginRules( eslintPluginReactConfigRecommended.plugins.react, ); const ignores = ` .tmp # Ignore directories and files in 'tests/format' tests/format/**/* # Unignore directories and 'jsfmt.spec.js', 'format.test.js' file !tests/format/**/ !tests/format/**/format.test.js # TODO: Remove this in 2025 !tests/format/**/jsfmt.spec.js tests/integration/cli/ test*.* scripts/release/node_modules coverage/ dist*/ **/node_modules/** website/build/ website/static/playground.js website/static/lib/ scripts/benchmark/*/ **/.yarn/** **/.pnp.* ` .split("\n") .filter((pattern) => pattern && !pattern.startsWith("#")); export default [ eslintPluginJs.configs.recommended, eslintPluginRegexp.configs["flat/recommended"], eslintPluginUnicorn.configs["flat/recommended"], eslintConfigPrettier, ...compat.env({ es2024: true, node: true }), { plugins: { "@stylistic/js": eslintPluginStylisticJs, "@typescript-eslint": eslintPluginTypescriptEslint, import: eslintPluginImport, n: eslintPluginN, "prettier-internal-rules": eslintPluginPrettierInternalRules, "simple-import-sort": eslintPluginSimpleImportSort, }, rules: { "arrow-body-style": ["error", "as-needed"], curly: "error", "dot-notation": "error", eqeqeq: "error", "logical-assignment-operators": "error", "no-console": isCI ? "error" : "warn", "no-constant-binary-expression": "error", "no-duplicate-imports": "error", "no-else-return": [ "error", { allowElseIf: false, }, ], "no-implicit-coercion": "error", "no-inner-declarations": "error", "no-lonely-if": "error", "no-unneeded-ternary": "error", "no-useless-return": "error", "no-unused-expressions": [ "error", { allowShortCircuit: true, allowTernary: true, }, ], "no-unused-vars": [ "error", { ignoreRestSiblings: true, }, ], "no-var": "error", "object-shorthand": [ "error", "always", { avoidExplicitReturnArrows: true, }, ], "one-var": ["error", "never"], "prefer-arrow-callback": "error", "prefer-const": [ "error", { destructuring: "all", }, ], "prefer-destructuring": [ "error", { VariableDeclarator: { array: false, object: true, }, AssignmentExpression: { array: false, object: false, }, }, { enforceForRenamedProperties: false, }, ], "prefer-object-has-own": "error", "prefer-object-spread": "error", "prefer-rest-params": "error", "prefer-spread": "error", "require-await": "error", "require-unicode-regexp": "error", "symbol-description": "error", yoda: [ "error", "never", { exceptRange: true, }, ], // Internal rules "prettier-internal-rules/jsx-identifier-case": "error", "prettier-internal-rules/massage-ast-parameter-names": "error", "prettier-internal-rules/no-identifier-n": "error", "prettier-internal-rules/prefer-fs-promises-submodule": "error", /* @stylistic/eslint-plugin-js */ "@stylistic/js/quotes": [ "error", "double", { avoidEscape: true, }, ], /* @typescript-eslint/eslint-plugin */ "@typescript-eslint/prefer-ts-expect-error": "error", /* eslint-plugin-import */ "import/no-extraneous-dependencies": [ "error", { devDependencies: [ "jest.config.js", "tests/**", "scripts/**", "website/**/*", "eslint.config.js", ], }, ], /* eslint-plugin-n */ "n/no-path-concat": "error", /* eslint-plugin-regexp */ "regexp/match-any": [ "error", { allows: ["dotAll"], }, ], /* cspell:disable-next-line */ "regexp/no-extra-lookaround-assertions": "error", "regexp/no-missing-g-flag": "error", "regexp/no-useless-flag": [ "error", { strictTypes: false, }, ], /* cspell:disable-next-line */ "regexp/prefer-lookaround": [ "error", { strictTypes: false, }, ], "regexp/no-super-linear-backtracking": "off", "regexp/unicode-property": [ "error", { generalCategory: "never", key: "long", property: { binary: "long", generalCategory: "long", script: "long", }, }, ], /* eslint-plugin-simple-import-sort */ "simple-import-sort/imports": "error", "simple-import-sort/exports": "error", /* eslint-plugin-unicorn */ "unicorn/escape-case": "off", "unicorn/catch-error-name": "off", "unicorn/consistent-destructuring": "off", "unicorn/consistent-function-scoping": "off", "unicorn/import-style": "off", "unicorn/no-array-callback-reference": "off", "unicorn/no-array-method-this-argument": "off", "unicorn/no-array-reduce": "off", "unicorn/no-await-expression-member": "off", "unicorn/no-for-loop": "off", "unicorn/no-hex-escape": "off", "unicorn/no-negated-condition": "off", "unicorn/no-nested-ternary": "off", "unicorn/no-null": "off", "unicorn/no-process-exit": "off", "unicorn/no-thenable": "off", "unicorn/no-unreadable-array-destructuring": "off", "unicorn/no-useless-switch-case": "off", "unicorn/no-useless-undefined": [ "error", { checkArrowFunctionBody: false, }, ], "unicorn/number-literal-case": "off", "unicorn/numeric-separators-style": "off", "unicorn/prefer-array-flat": [ "error", { functions: ["flat", "flatten"], }, ], "unicorn/prefer-add-event-listener": "off", "unicorn/prefer-at": [ "error", { getLastElementFunctions: ["getLast"], }, ], "unicorn/prefer-code-point": "off", "unicorn/prefer-dom-node-append": "off", "unicorn/prefer-dom-node-remove": "off", "unicorn/prefer-export-from": [ "error", { ignoreUsedVariables: true, }, ], "unicorn/prefer-query-selector": "off", "unicorn/prefer-ternary": "off", "unicorn/prevent-abbreviations": "off", "unicorn/relative-url-style": "off", "unicorn/switch-case-braces": ["error", "avoid"], "unicorn/template-indent": "error", }, linterOptions: { reportUnusedDisableDirectives: "error", }, }, { ignores, }, // CommonJS modules { files: [ "**/*.cjs", "scripts/tools/eslint-plugin-prettier-internal-rules/**/*.js", "website/**/*.js", ], languageOptions: { sourceType: "script", }, rules: { strict: ["error", "global"], "unicorn/prefer-module": "off", "unicorn/prefer-node-protocol": "off", }, }, { files: ["scripts/**/*", "tests/config/install-prettier.js"], rules: { "no-console": "off", }, }, { files: ["scripts/**/*.js"], rules: { "unicorn/prefer-top-level-await": "error", }, }, { files: [ "tests/config/**/*.js", "tests/format/**/format.test.js", "tests/integration/**/*.js", "tests/unit/**/*.js", "tests/dts/unit/**/*.js", "scripts/release/__tests__/**/*.spec.js", ], plugins: { jest: eslintPluginJest }, languageOptions: { globals: eslintPluginJest.environments.globals.globals, }, rules: { "@stylistic/js/quotes": [ "error", "double", { avoidEscape: true, allowTemplateLiterals: true, }, ], "jest/valid-expect": [ "error", { alwaysAwait: true, }, ], "jest/prefer-to-be": "error", }, }, { files: ["tests/format/**/*.js"], rules: { "prettier-internal-rules/no-legacy-format-test": "error", }, }, { files: ["tests/integration/**/*.js"], rules: { "prettier-internal-rules/await-cli-tests": "error", }, }, { files: ["tests/**/*.js"], rules: { // TODO: Enable this when we drop support for Node.js v14 "logical-assignment-operators": "off", "unicorn/prefer-array-flat": "off", "unicorn/prefer-array-flat-map": "off", "unicorn/prefer-string-replace-all": "off", }, languageOptions: { globals: { runCli: "readonly", runFormatTest: "readonly", }, }, }, { files: ["src/cli/**/*.js"], rules: { "n/no-restricted-import": [ "error", [ { name: [ toPath("src/**"), `!${toPath("src/cli/**")}`, `!${toPath("src/index.js")}`, ], message: "Don't use code from other directory.", }, ], ], }, }, { files: ["src/language-js/needs-parens.js"], rules: { "prettier-internal-rules/better-parent-property-check-in-needs-parens": "error", }, }, { files: ["src/**/*.js"], rules: { "prettier-internal-rules/flat-ast-path-call": "error", "prettier-internal-rules/no-conflicting-comment-check-flags": "error", "prettier-internal-rules/no-doc-public-import": "error", "prettier-internal-rules/no-empty-flat-contents-for-if-break": "error", "prettier-internal-rules/no-unnecessary-ast-path-call": "error", "prettier-internal-rules/prefer-ast-path-each": "error", "prettier-internal-rules/prefer-indent-if-break": "error", "prettier-internal-rules/prefer-is-non-empty-array": "error", "prettier-internal-rules/prefer-ast-path-getters": "error", }, }, { files: ["src/language-*/**/*.js"], rules: { "prettier-internal-rules/directly-loc-start-end": "error", }, }, { files: ["src/language-js/**/*.js"], ignores: ["src/language-js/parse/postprocess/*.js"], rules: { "prettier-internal-rules/no-node-comments": [ "error", { file: "src/language-js/utils/index.js", functions: ["hasComment", "getComments"], }, "src/language-js/pragma.js", "src/language-js/parse/babel.js", "src/language-js/parse/meriyah.js", "src/language-js/parse/json.js", "src/language-js/parse/acorn.js", "src/language-js/parse/utils/wrap-babel-expression.js", ], "prettier-internal-rules/prefer-create-type-check-function": [ "error", { ignoreSingleType: true, onlyTopLevelFunctions: true, }, ], }, }, ...compat .env({ browser: true, worker: true }) .map((config) => ({ ...config, files: ["website/**/*"] })), // Use `Object.assign` since it contains non-enumerable properties Object.assign(eslintPluginReactConfigRecommended, { files: ["website/**/*"], settings: { react: { version: "18", }, }, }), { files: ["website/**/*"], rules: { "react/display-name": "off", "react/no-deprecated": "off", "react/prop-types": "off", "unicorn/filename-case": "off", }, }, { files: ["website/playground/**/*"], languageOptions: { sourceType: "module", }, }, // `import/no-extraneous-dependencies` reports on Windows but not on CI { files: ["website/siteConfig.js"], linterOptions: { reportUnusedDisableDirectives: "off", }, }, { files: ["bin/prettier.cjs"], languageOptions: { ecmaVersion: 5, }, rules: { "no-var": "off", "prefer-arrow-callback": "off", }, }, ];