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eslint.config.mjs
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eslint.config.mjs
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// @ts-check
import eslint from "@eslint/js";
import * as regexpPlugin from "eslint-plugin-regexp";
import fs from "fs";
import globals from "globals";
import { createRequire } from "module";
import path from "path";
import tseslint from "typescript-eslint";
import url from "url";
const __filename = url.fileURLToPath(new URL(import.meta.url));
const __dirname = path.dirname(__filename);
const require = createRequire(import.meta.url);
const rulesDir = path.join(__dirname, "scripts", "eslint", "rules");
const ext = ".cjs";
const ruleFiles = fs.readdirSync(rulesDir).filter(p => p.endsWith(ext));
export default tseslint.config(
{
files: ["**/*.{ts,tsx,cts,mts,js,cjs,mjs}"],
},
{
ignores: [
"**/node_modules/**",
"built/**",
"tests/**",
"lib/**",
"src/lib/*.generated.d.ts",
"scripts/**/*.js",
"scripts/**/*.d.*",
"internal/**",
"coverage/**",
],
},
eslint.configs.recommended,
...tseslint.configs.recommended,
...tseslint.configs.stylistic,
regexpPlugin.configs["flat/recommended"],
{
plugins: {
local: {
rules: Object.fromEntries(ruleFiles.map(p => {
return [p.slice(0, -ext.length), require(path.join(rulesDir, p))];
})),
},
},
},
{
languageOptions: {
parserOptions: {
warnOnUnsupportedTypeScriptVersion: false,
},
globals: globals.node,
},
},
{
rules: {
// eslint
"dot-notation": "error",
"eqeqeq": "error",
"no-caller": "error",
"no-constant-condition": ["error", { checkLoops: false }],
"no-eval": "error",
"no-extra-bind": "error",
"no-new-func": "error",
"no-new-wrappers": "error",
"no-return-await": "error",
"no-template-curly-in-string": "error",
"no-throw-literal": "error",
"no-undef-init": "error",
"no-var": "error",
"object-shorthand": "error",
"prefer-const": "error",
"prefer-object-spread": "error",
"unicode-bom": ["error", "never"],
"no-restricted-syntax": [
"error",
{
selector: "Literal[raw=null]",
message: "Avoid using null; use undefined instead.",
},
{
selector: "TSNullKeyword",
message: "Avoid using null; use undefined instead.",
},
],
// Enabled in eslint:recommended, but not applicable here
"no-extra-boolean-cast": "off",
"no-case-declarations": "off",
"no-cond-assign": "off",
"no-control-regex": "off",
"no-inner-declarations": "off",
// @typescript-eslint/eslint-plugin
"@typescript-eslint/naming-convention": [
"error",
{ selector: "typeLike", format: ["PascalCase"], filter: { regex: "^(__String|[A-Za-z]+_[A-Za-z]+)$", match: false } },
{ selector: "interface", format: ["PascalCase"], custom: { regex: "^I[A-Z]", match: false }, filter: { regex: "^I(Arguments|TextWriter|O([A-Z][a-z]+[A-Za-z]*)?)$", match: false } },
{ selector: "variable", format: ["camelCase", "PascalCase", "UPPER_CASE"], leadingUnderscore: "allow", filter: { regex: "^(_{1,2}filename|_{1,2}dirname|_+|[A-Za-z]+_[A-Za-z]+)$", match: false } },
{ selector: "function", format: ["camelCase", "PascalCase"], leadingUnderscore: "allow", filter: { regex: "^[A-Za-z]+_[A-Za-z]+$", match: false } },
{ selector: "parameter", format: ["camelCase"], leadingUnderscore: "allow", filter: { regex: "^(_+|[A-Za-z]+_[A-Z][a-z]+)$", match: false } },
{ selector: "method", format: ["camelCase", "PascalCase"], leadingUnderscore: "allow", filter: { regex: "^([0-9]+|[A-Za-z]+_[A-Za-z]+)$", match: false } },
{ selector: "memberLike", format: ["camelCase"], leadingUnderscore: "allow", filter: { regex: "^([0-9]+|[A-Za-z]+_[A-Za-z]+)$", match: false } },
{ selector: "enumMember", format: ["camelCase", "PascalCase"], leadingUnderscore: "allow", filter: { regex: "^[A-Za-z]+_[A-Za-z]+$", match: false } },
// eslint-disable-next-line no-restricted-syntax
{ selector: "property", format: null },
],
"@typescript-eslint/unified-signatures": "error",
"no-unused-expressions": "off",
"@typescript-eslint/no-unused-expressions": ["error", { allowTernary: true }],
// Rules enabled in typescript-eslint configs that are not applicable here
"@typescript-eslint/ban-ts-comment": "off",
"@typescript-eslint/class-literal-property-style": "off",
"@typescript-eslint/consistent-indexed-object-style": "off",
"@typescript-eslint/no-duplicate-enum-values": "off",
"@typescript-eslint/no-empty-function": "off",
"@typescript-eslint/no-namespace": "off",
"@typescript-eslint/no-non-null-asserted-optional-chain": "off",
"@typescript-eslint/no-var-requires": "off",
"@typescript-eslint/no-empty-interface": "off",
"@typescript-eslint/no-explicit-any": "off",
"@typescript-eslint/no-empty-object-type": "off", // {} is a totally useful and valid type.
"@typescript-eslint/no-require-imports": "off",
"@typescript-eslint/no-unused-vars": [
"warn",
{
// Ignore: (solely underscores | starting with exactly one underscore)
argsIgnorePattern: "^(_+$|_[^_])",
varsIgnorePattern: "^(_+$|_[^_])",
// Not setting an ignore pattern for caught errors; those can always be safely removed.
},
],
"@typescript-eslint/no-inferrable-types": "off",
// Pending https://github.com/typescript-eslint/typescript-eslint/issues/4820
"@typescript-eslint/prefer-optional-chain": "off",
// scripts/eslint/rules
"local/only-arrow-functions": [
"error",
{
allowNamedFunctions: true,
allowDeclarations: true,
},
],
"local/argument-trivia": "error",
"local/no-in-operator": "error",
"local/debug-assert": "error",
"local/no-keywords": "error",
"local/jsdoc-format": "error",
"local/js-extensions": "error",
"local/no-array-mutating-method-expressions": "error",
},
},
{
files: ["**/*.mjs", "**/*.mts"],
rules: {
// These globals don't exist outside of CJS files.
"no-restricted-globals": [
"error",
{ name: "__filename" },
{ name: "__dirname" },
{ name: "require" },
{ name: "module" },
{ name: "exports" },
],
},
},
{
files: ["src/**"],
languageOptions: {
parserOptions: {
tsconfigRootDir: __dirname,
project: "./src/tsconfig-eslint.json",
},
},
},
{
files: ["scripts/**"],
languageOptions: {
parserOptions: {
tsconfigRootDir: __dirname,
project: "./scripts/tsconfig.json",
},
},
},
{
files: ["src/**"],
rules: {
"@typescript-eslint/no-unnecessary-type-assertion": "error",
"no-restricted-globals": [
"error",
{ name: "setTimeout" },
{ name: "clearTimeout" },
{ name: "setInterval" },
{ name: "clearInterval" },
{ name: "setImmediate" },
{ name: "clearImmediate" },
{ name: "performance" },
],
"local/no-direct-import": "error",
},
},
{
files: ["src/harness/**", "src/testRunner/**"],
rules: {
"no-restricted-globals": "off",
"regexp/no-super-linear-backtracking": "off",
"local/no-direct-import": "off",
},
},
{
files: ["src/**/_namespaces/**"],
rules: {
"local/no-direct-import": "off",
},
},
{
files: ["src/lib/*.d.ts"],
...tseslint.configs.disableTypeChecked,
},
{
files: ["src/lib/*.d.ts"],
languageOptions: {
globals: {},
},
rules: {
"@typescript-eslint/interface-name-prefix": "off",
"@typescript-eslint/prefer-function-type": "off",
"@typescript-eslint/unified-signatures": "off",
"@typescript-eslint/no-unsafe-function-type": "off",
"@typescript-eslint/no-wrapper-object-types": "off",
"@typescript-eslint/no-unused-vars": "off",
// scripts/eslint/rules
"local/no-keywords": "off",
// eslint
"no-var": "off",
"no-restricted-globals": "off",
"no-shadow-restricted-names": "off",
"no-restricted-syntax": "off",
},
},
{
files: ["src/lib/es2019.array.d.ts"],
rules: {
"@typescript-eslint/array-type": "off",
},
},
);