.eslintrc.js

module.exports = {
  env: {
    browser: true,
    commonjs: true,
    es6: false,
  },
  extends: [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    // "plugin:@typescript-eslint/recommended-requiring-type-checking",
  ],
  parser: "@typescript-eslint/parser",
  parserOptions: {
    ecmaVersion: 8,
    sourceType: "module",
    ecmaFeatures: {
      experimentalObjectRestSpread: true,
    },
    project: ["./tsconfig.json", "./test/tsconfig.json", "./tools/tsconfig.json", "./test/cypress/tsconfig.json"],
  },
  plugins: ["@typescript-eslint"],
  rules: {
    "accessor-pairs": [
      "error",
      {
        setWithoutGet: true,
        getWithoutSet: false,
      },
    ],
    "array-bracket-newline": ["off"],
    "array-bracket-spacing": ["off"],
    "array-callback-return": ["off"],
    "array-element-newline": ["off"],
    "arrow-body-style": ["off"],
    "arrow-parens": ["off"],
    "arrow-spacing": ["off"],
    "block-scoped-var": ["off"],
    "block-spacing": ["off"],
    "brace-style": ["off"],
    "callback-return": ["error"],
    camelcase: ["off"],
    "capitalized-comments": ["off"],
    "class-methods-use-this": ["off"],
    complexity: ["off"],
    "consistent-return": ["off"],
    "consistent-this": ["off"],
    "constructor-super": ["error"],
    curly: ["off"],
    "default-case": ["off"],
    "dot-notation": ["off"],
    "eol-last": ["error"],
    eqeqeq: ["off"],
    "for-direction": ["error"],
    "func-call-spacing": ["off"],
    "func-name-matching": ["error"],
    "func-names": ["off", "never"],
    "func-style": ["off"],
    "function-paren-newline": ["off"],
    "getter-return": [
      "error",
      {
        allowImplicit: false,
      },
    ],
    "global-require": ["off"],
    "guard-for-in": ["off"],
    "handle-callback-err": ["error"],
    "id-blacklist": ["error"],
    "id-length": ["off"],
    "id-match": ["error"],
    indent: ["off"],
    "indent-legacy": ["off"],
    "init-declarations": ["off"],
    "key-spacing": ["off"],
    "keyword-spacing": ["off"],
    "line-comment-position": ["off"],
    "linebreak-style": [
      "off", // Line endings automatically converted to LF on git commit so probably shouldn't care about it here
    ],
    "lines-around-comment": ["off"],
    "lines-around-directive": ["error"],
    "lines-between-class-members": ["error"],
    "max-depth": ["off"],
    "max-len": ["off"],
    "max-lines": ["off"],
    "max-nested-callbacks": ["error"],
    "max-params": ["off"],
    "max-statements": ["off"],
    "max-statements-per-line": ["off"],
    "multiline-comment-style": ["off", "starred-block"],
    "multiline-ternary": ["off", "never"],
    "new-cap": ["off"],
    "new-parens": ["off"],
    "newline-after-var": ["off"],
    "newline-before-return": ["off"],
    "newline-per-chained-call": ["off"],
    "no-alert": ["error"],
    "no-array-constructor": ["error"],
    "no-await-in-loop": ["error"],
    "no-bitwise": ["off"],
    "no-buffer-constructor": ["error"],
    "no-caller": ["error"],
    "no-case-declarations": ["error"],
    "no-catch-shadow": ["error"],
    "no-class-assign": ["error"],
    "no-compare-neg-zero": ["error"],
    "no-confusing-arrow": ["error"],
    "no-console": ["off"],
    "no-const-assign": ["error"],
    "no-constant-condition": [
      "error",
      {
        checkLoops: false,
      },
    ],
    "no-continue": ["off"],
    "no-control-regex": ["error"],
    "no-debugger": ["error"],
    "no-delete-var": ["error"],
    "no-div-regex": ["error"],
    "no-dupe-args": ["error"],
    "no-dupe-class-members": ["error"],
    "no-dupe-keys": ["error"],
    "no-duplicate-case": ["error"],
    "no-duplicate-imports": [
      "error",
      {
        includeExports: true,
      },
    ],
    "no-else-return": ["off"],
    "no-empty": [
      "off",
      {
        allowEmptyCatch: false,
      },
    ],
    "no-empty-character-class": ["error"],
    "no-empty-function": ["off"],
    "no-empty-pattern": ["error"],
    "no-eq-null": ["off"],
    "no-ex-assign": ["off"],
    "no-extra-boolean-cast": ["error"],
    "no-extra-parens": ["off"],
    "no-extra-semi": ["error"],
    "no-eval": ["off"],
    "no-extend-native": ["off"],
    "no-extra-bind": ["error"],
    "no-extra-label": ["error"],
    "no-fallthrough": ["off"],
    "no-floating-decimal": ["off"],
    "no-func-assign": ["error"],
    "no-global-assign": ["error"],
    "no-implicit-coercion": ["off"],
    "no-implicit-globals": ["error"],
    "no-implied-eval": ["error"],
    "no-inline-comments": ["off"],
    "no-inner-declarations": ["off", "both"],
    "no-invalid-regexp": ["error"],
    "no-invalid-this": ["off"],
    "no-irregular-whitespace": [
      "error",
      {
        skipStrings: false,
        skipComments: false,
        skipRegExps: false,
        skipTemplates: false,
      },
    ],
    "no-iterator": ["error"],
    "no-label-var": ["error"],
    "no-labels": ["off"],
    "no-lone-blocks": ["error"],
    "no-lonely-if": ["error"],
    "no-loop-func": ["off"],
    "no-magic-numbers": ["off"],
    "no-mixed-operators": ["off"],
    "no-mixed-requires": ["error"],
    "no-mixed-spaces-and-tabs": ["error"],
    "no-multi-assign": ["off"],
    "no-multi-spaces": ["off"],
    "no-multi-str": ["error"],
    "no-multiple-empty-lines": [
      "off",
      {
        max: 1,
      },
    ],
    "no-native-reassign": ["error"],
    "no-negated-condition": ["off"],
    "no-negated-in-lhs": ["error"],
    "no-nested-ternary": ["off"],
    "no-new": ["error"],
    "no-new-func": ["error"],
    "no-new-object": ["error"],
    "no-new-require": ["error"],
    "no-new-symbol": ["error"],
    "no-new-wrappers": ["error"],
    "no-octal": ["error"],
    "no-octal-escape": ["error"],
    "no-obj-calls": ["error"],
    "no-param-reassign": ["off"],
    "no-path-concat": ["error"],
    "no-plusplus": ["off"],
    "no-process-env": ["off"],
    "no-process-exit": ["error"],
    "no-proto": ["error"],
    "no-prototype-builtins": ["off"],
    "no-redeclare": ["off"],
    "no-regex-spaces": ["error"],
    "no-restricted-globals": ["error"],
    "no-restricted-imports": ["error"],
    "no-restricted-modules": ["error"],
    "no-restricted-properties": [
      "off",
      {
        object: "console",
        property: "log",
        message: "'log' is too general, use an appropriate level when logging.",
      },
    ],
    "no-restricted-syntax": ["error"],
    "no-return-assign": ["off"],
    "no-return-await": ["error"],
    "no-script-url": ["error"],
    "no-self-assign": [
      "error",
      {
        props: false,
      },
    ],
    "no-self-compare": ["error"],
    "no-sequences": ["error"],
    "no-shadow": ["off"],
    "no-shadow-restricted-names": ["error"],
    "no-spaced-func": ["off"],
    "no-sparse-arrays": ["error"],
    "no-sync": ["error"],
    "no-tabs": ["off"],
    "no-template-curly-in-string": ["error"],
    "no-ternary": ["off"],
    "no-this-before-super": ["off"],
    "no-throw-literal": ["error"],
    "no-trailing-spaces": ["error"],
    "no-undef": ["off"],
    "no-undef-init": ["error"],
    "no-undefined": ["off"],
    "no-underscore-dangle": ["off"],
    "no-unexpected-multiline": ["error"],
    "no-unmodified-loop-condition": ["error"],
    "no-unneeded-ternary": ["off"],
    "no-unreachable": ["off"],
    "no-unsafe-finally": ["error"],
    "no-unsafe-negation": ["error"],
    "no-unused-expressions": ["off"],
    "no-unused-labels": ["error"],
    "no-unused-vars": ["off"],
    "no-use-before-define": ["off"],
    "no-useless-call": ["off"],
    "no-useless-computed-key": ["error"],
    "no-useless-concat": ["error"],
    "no-useless-constructor": ["error"],
    "no-useless-escape": ["off"],
    "no-useless-rename": [
      "error",
      {
        ignoreDestructuring: false,
        ignoreExport: false,
        ignoreImport: false,
      },
    ],
    "no-useless-return": ["off"],
    "no-var": ["off"],
    "no-void": ["off"],
    "no-warning-comments": ["off"],
    "no-whitespace-before-property": ["error"],
    "no-with": ["error"],
    "nonblock-statement-body-position": ["off", "below"],
    "object-curly-newline": ["off"],
    "object-curly-spacing": ["off"],
    "object-property-newline": ["off"],
    "object-shorthand": ["off"],
    "one-var": ["off"],
    "one-var-declaration-per-line": ["off"],
    "operator-assignment": ["off"],
    "operator-linebreak": ["off", "none"],
    "padded-blocks": ["off"],
    "padding-line-between-statements": ["error"],
    "prefer-arrow-callback": ["off"],
    "prefer-const": ["off"],
    "prefer-destructuring": ["off"],
    "prefer-numeric-literals": ["error"],
    "prefer-promise-reject-errors": ["off"],
    "prefer-reflect": ["off"],
    "prefer-rest-params": ["off"],
    "prefer-spread": ["off"],
    "prefer-template": ["off"],
    "quote-props": ["off"],
    quotes: ["off"],
    radix: ["off", "as-needed"],
    "require-await": ["off"],
    "require-jsdoc": ["off"],
    "require-yield": ["error"],
    "rest-spread-spacing": ["error", "never"],
    semi: ["off"],
    "semi-spacing": ["off"],
    "semi-style": ["error", "last"],
    "sort-imports": ["off"],
    "sort-keys": ["off"],
    "sort-vars": ["off"],
    "space-before-blocks": ["off"],
    "space-before-function-paren": ["off"],
    "space-in-parens": ["off"],
    "space-infix-ops": ["off"],
    "space-unary-ops": ["off"],
    "spaced-comment": ["off"],
    strict: ["off"],
    "switch-colon-spacing": [
      "error",
      {
        after: true,
        before: false,
      },
    ],
    "symbol-description": ["error"],
    "template-curly-spacing": ["error"],
    "template-tag-spacing": ["error"],
    "unicode-bom": ["error", "never"],
    "use-isnan": ["error"],
    "valid-jsdoc": ["off"],
    "valid-typeof": ["error"],
    "vars-on-top": ["off"],
    "wrap-iife": ["error", "any"],
    "wrap-regex": ["off"],
    "yield-star-spacing": ["error", "before"],
    yoda: ["error", "never"],
    "@typescript-eslint/explicit-module-boundary-types": "off",
    "@typescript-eslint/explicit-function-return-type": "off",
  },
  overrides: [
    {
      // enable the rule specifically for TypeScript files
      files: ["*.ts", "*.tsx"],
      rules: {
        "@typescript-eslint/explicit-function-return-type": ["error"],
        "@typescript-eslint/explicit-module-boundary-types": ["error"],
      },
    },
    {
      // TypeScript configuration
      files: ["**/*.ts", "**/*.tsx"],
      parser: "@typescript-eslint/parser",
      plugins: ["@typescript-eslint"],
      extends: ["plugin:@typescript-eslint/recommended"],
      rules: {
        "lines-between-class-members": "off",
        "no-empty-pattern": "off",
        "no-useless-constructor": [
          "off", // Valid for typescript due to property ctor shorthand
        ],
        "@typescript-eslint/no-unused-vars": ["error", { argsIgnorePattern: "^_" }],
        "@typescript-eslint/ban-ts-comment": "off",
        "@typescript-eslint/ban-ts-ignore": "off",
        "@typescript-eslint/camelcase": "off",
        "@typescript-eslint/explicit-function-return-type": [
          "error",
          {
            allowExpressions: true,
          },
        ],
        "@typescript-eslint/member-delimiter-style": [
          "error",
          {
            multiline: {
              delimiter: "semi",
              requireLast: true,
            },
            singleline: {
              delimiter: "semi",
              requireLast: false,
            },
          },
        ],
        "@typescript-eslint/member-ordering": [
          "error",
          {
            default: [
              "signature",
              "static-field",
              "instance-field",
              "abstract-field",
              "constructor",
              "instance-method",
              "abstract-method",
              "static-method",
            ],
          },
        ],
        "@typescript-eslint/no-explicit-any": "off",
        "@typescript-eslint/no-use-before-define": "off",
      },
    },
  ],
};