.eslintrc.js

module.exports = {
  env: {
    browser: true,
    es6: true,
    node: true,
    jest: true,
  },
  parser: "@typescript-eslint/parser",
  extends: [
    "plugin:@typescript-eslint/recommended",
    "eslint:recommended",
    "prettier",
  ],
  parserOptions: {
    ecmaVersion: "esnext",
    ecmaFeatures: {
      experimentalObjectRestSpread: true,
      jsx: true,
    },
  },
  plugins: ["babel", "prettier"],
  ignorePatterns: ["node_modules", "dist", "@types/modules.d.ts"],
  overrides: [
    {
      files: ["bin/*"],
      rules: {
        "@typescript-eslint/no-var-requires": 0,
        "@typescript-eslint/explicit-function-return-type": 0,
      },
    },
  ],
  rules: {
    // Plugin rules:
    "prettier/prettier": "error",

    // overriding recommended rules
    "no-constant-condition": ["error", { checkLoops: false }],
    "no-console": ["error", { allow: ["log", "warn", "error"] }],
    "@typescript-eslint/no-use-before-define": 0,
    "@typescript-eslint/no-explicit-any": 0,
    "@typescript-eslint/no-empty-function": 0,
    "@typescript-eslint/no-non-null-assertion": 0,
    "no-inner-declarations": 0,
    "@typescript-eslint/no-empty-interface": 0,
    "no-redeclare": 0,

    // Use typescript's
    "no-unused-vars": 0,
    "no-undef": "off",

    "@typescript-eslint/no-unused-vars": [
      "error",
      {
        argsIgnorePattern: "^_",
        varsIgnorePattern: "^_",
      },
    ],
    "@typescript-eslint/explicit-function-return-type": 0,

    // possible errors
    "array-callback-return": "error",
    "consistent-return": "error",
    "default-case": "error",
    "dot-notation": "error",
    eqeqeq: "error",
    "for-direction": "error",
    "no-alert": "error",
    "no-caller": "error",
    "no-eval": "error",
    "no-extend-native": "error",
    "no-extra-bind": "error",
    "no-extra-label": "error",
    "no-implied-eval": "error",
    // We use the version from the babel plugin so that `this` in a function
    // class property doesn't give a false positive.
    "babel/no-invalid-this": "error",
    "no-return-await": "error",
    "no-self-compare": "error",
    "no-throw-literal": "error",
    "no-unmodified-loop-condition": "error",
    "no-useless-call": "error",
    "no-useless-computed-key": "error",
    "no-useless-concat": "error",
    "no-useless-constructor": "error",
    "no-useless-rename": "error",
    "no-useless-return": "error",
    "no-var": "error",
    "no-void": "error",
    "no-with": "error",
    "prefer-const": "error",
    "prefer-promise-reject-errors": "error",
    "prefer-rest-params": "error",
    "prefer-spread": "error",
    "no-else-return": "error",
  },
};