.eslintrc.js

const path = require("path");

module.exports = {
  root: true,
  parser: "@typescript-eslint/parser",
  parserOptions: {
    tsconfigRootDir: __dirname, // this is the reason this is a .js file
    project: ["./tsconfig.eslint.json"],
  },
  plugins: ["jest", "eslint-plugin-import", "eslint-plugin-unused-imports", "prettier"],
  extends: [
    "es/node",
    "plugin:import/errors",
    "plugin:import/warnings",
    "plugin:import/typescript",
    'plugin:@typescript-eslint/recommended',
    'prettier',
  ],
  settings: {
    "import/parsers": {
      "@typescript-eslint/parser": [".ts", ".tsx"],
    },
    "import/resolver": {
      typescript: {
        alwaysTryTypes: true, // always try to resolve types under `<root>@types` directory even it doesn't contain any source code, like `@types/rdf-js`
      },
      "eslint-import-resolver-lerna": {
        packages: path.resolve(__dirname, "packages"),
      },
    },
  },
  globals: {
    window: false,
    fetch: false,
    Headers: false,
    Request: false,
    XMLHttpRequest: false,
  },
  rules: {
    // Default
    "keyword-spacing": "off",
    "@typescript-eslint/keyword-spacing": "off",
    "import/group-exports": "off",
    "import/exports-last": "off",
    "mocha/valid-test-description": "off",
    "unicorn/prefer-at": "off",
    "array-bracket-spacing": "off",
    "linebreak-style": "off",
    "class-methods-use-this": "off", // Conflicts with functions from interfaces that sometimes don't require `this`
    "comma-dangle": ["error", "always-multiline"],
    "dot-location": ["error", "property"],
    "lines-between-class-members": [
      "error",
      "always",
      { exceptAfterSingleLine: true },
    ],
    "no-underscore-dangle": "off", // Conflicts with external libraries
    "padding-line-between-statements": "off",
    "no-param-reassign": "off",
    "func-style": "off",
    "new-cap": "off",
    "no-console": "off",
    "lines-around-comment": [
      "error",
      {
        beforeBlockComment: false,
        afterBlockComment: false,
        beforeLineComment: false,
        afterLineComment: false,
      },
    ],
    "no-multi-assign": "off",
    "no-plusplus": "off",
    "guard-for-in": "off",
    "sort-imports": "off", // Disabled in favor of eslint-plugin-import
    "prefer-named-capture-group": "off",
    "max-len": [
      "error",
      {
        code: 120,
        ignoreTemplateLiterals: true,
      },
    ],
    "unicorn/consistent-function-scoping": "off",
    "no-warning-comments": "off",
    "no-mixed-operators": "off",
    "prefer-destructuring": "off",
    "default-case": "off", // TSC already takes care of these checks
    "no-loop-func": "off",
    "unicorn/no-fn-reference-in-iterator": "off",
    "extended/consistent-err-names": "off",
    "unicorn/prefer-replace-all": "off",
    "unicorn/catch-error-name": ["error", { name: "error" }],
    "unicorn/no-reduce": "off",
    "no-duplicate-imports": "off", // Incompatible with type imports
    "unicorn/consistent-destructuring": "off",
    "unicorn/no-array-callback-reference": "off",
    "unicorn/no-new-array": "off",

    // TS
    "@typescript-eslint/lines-between-class-members": [
      "error",
      { exceptAfterSingleLine: true },
    ],
    "@typescript-eslint/no-invalid-void-type": "off", // breaks with default void in Asynchandler 2nd generic
    "@typescript-eslint/array-type": ["error", { default: "array" }],
    "@typescript-eslint/generic-type-naming": "off",
    "@typescript-eslint/no-empty-interface": "off",
    "@typescript-eslint/no-unnecessary-condition": "off", // Problems with optional parameters
    "@typescript-eslint/space-before-function-paren": [
      "error",
      { anonymous: "always", named: "never", asyncArrow: "always" },
    ],
    "@typescript-eslint/promise-function-async": "off",
    "@typescript-eslint/consistent-type-assertions": [
      "error",
      { assertionStyle: "angle-bracket" },
    ],
    "@typescript-eslint/member-naming": "off",
    "@typescript-eslint/naming-convention": [
      "error",
      {
        selector: "interface",
        format: ["PascalCase"],
        custom: {
          regex: "^[A-Z]",
          match: true,
        },
      },
    ],
    "@typescript-eslint/no-dynamic-delete": "off",
    "@typescript-eslint/explicit-function-return-type": [
      "error",
      {
        allowExpressions: true,
        allowTypedFunctionExpressions: true,
        allowHigherOrderFunctions: true,
        allowConciseArrowFunctionExpressionsStartingWithVoid: true,
      },
    ],
    "@typescript-eslint/no-use-before-define": "off",
    "@typescript-eslint/prefer-nullish-coalescing": "off",
    "@typescript-eslint/consistent-type-imports": [
      "error",
      { prefer: "type-imports" },
    ],

    // Import
    "import/order": [
      "error",
      {
        alphabetize: {
          order: "asc",
          caseInsensitive: true,
        },
      },
    ],
    "import/no-unused-modules": "off",
    "unused-imports/no-unused-imports-ts": "error",

    // TODO: Try to re-enable the following rules in the future
    "import/no-extraneous-dependencies": "off",
    "global-require": "off",
    "no-process-env": "off",
    "@typescript-eslint/no-require-imports": "off",
    "@typescript-eslint/no-var-requires": "off",
    "@typescript-eslint/no-unused-vars": "off",
    "tsdoc/syntax": "off",
    "unicorn/expiring-todo-comments": "off",
    "unicorn/import-style": "off",
    "unicorn/prefer-array-flat": "off",
    "unicorn/prefer-spread": "off",
  },
  overrides: [
    {
      // Specific rules for bin files
      files: ["**/bin/*.ts"],
      rules: {
        "unicorn/filename-case": [
          "error",
          {
            case: "kebabCase",
          },
        ],
        "no-process-env": "off",
        "unicorn/no-process-exit": "off",
      },
    },
    {
      // Specific rules for test files
      files: ["**/test/**/*.ts"],
      env: {
        "jest/globals": true,
      },
      globals: {
        spyOn: false,
        fail: false,
      },
      rules: {
        "mocha/no-synchronous-tests": "off",
        "mocha/valid-test-description": "off",
        "mocha/no-sibling-hooks": "off",

        "max-statements-per-line": "off",
        "id-length": "off",
        "arrow-body-style": "off",
        "line-comment-position": "off",
        "no-inline-comments": "off",
        "unicorn/filename-case": "off",
        "no-new": "off",
        "unicorn/no-nested-ternary": "off",
        "no-return-assign": "off",
        "no-useless-call": "off",
        "no-sync": "off",

        "@typescript-eslint/brace-style": "off",
        "@typescript-eslint/ban-ts-comment": "off",
        "@typescript-eslint/ban-ts-ignore": "off",
        "@typescript-eslint/explicit-function-return-type": "off",
        "@typescript-eslint/unbound-method": "off",
        "@typescript-eslint/no-extra-parens": "off",
        "@typescript-eslint/restrict-plus-operands": "off",
        "import/no-extraneous-dependencies": "off",
      },
    },
  ],
};