.eslintrc.js

module.exports = {
  env: {
    browser: true,
    es6: true,
  },
  extends: [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:import/errors",
    "plugin:import/warnings",
    "plugin:import/typescript",
    "prettier",
    "prettier/@typescript-eslint",
  ],
  parser: "@typescript-eslint/parser",
  parserOptions: {
    ecmaVersion: 11,
    project: "./tsconfig.json",
    sourceType: "module",
  },
  plugins: ["@typescript-eslint", "prefer-arrow"],
  rules: {
    "@typescript-eslint/adjacent-overload-signatures": "error",
    "@typescript-eslint/ban-ts-comment": "off",
    "@typescript-eslint/array-type": "error",
    "@typescript-eslint/ban-ts-comment": "off",
    "@typescript-eslint/explicit-function-return-type": "off",
    "@typescript-eslint/explicit-module-boundary-types": "error",
    "@typescript-eslint/no-unused-vars": "error",
    "@typescript-eslint/no-use-before-define": "error",
    "@typescript-eslint/no-var-requires": "error",
    "@typescript-eslint/prefer-for-of": "error",
    "@typescript-eslint/prefer-function-type": "error",
    "@typescript-eslint/prefer-namespace-keyword": "error",
    "@typescript-eslint/prefer-nullish-coalescing": "error",
    "@typescript-eslint/no-explicit-any": "off",
    "@typescript-eslint/indent": "off",
    "@typescript-eslint/member-delimiter-style": [
      "error",
      {
        multiline: {
          delimiter: "semi",
          requireLast: true,
        },
        singleline: {
          delimiter: "semi",
          requireLast: false,
        },
      },
    ],
    "@typescript-eslint/naming-convention": [
      "error",
      {
        selector: "default",
        format: ["camelCase"],
      },
      {
        selector: "variable",
        format: ["camelCase", "UPPER_CASE", "PascalCase"],
        leadingUnderscore: "allow",
      },
      {
        selector: "function",
        format: ["PascalCase", "camelCase"],
      },
      {
        selector: "enumMember",
        format: ["UPPER_CASE"],
      },
      {
        selector: "method",
        format: ["PascalCase", "camelCase"],
      },
      {
        selector: "parameter",
        format: ["camelCase", "PascalCase"],
        leadingUnderscore: "allow",
      },
      {
        selector: "property",
        format: ["strictCamelCase", "camelCase", "PascalCase", "UPPER_CASE", "snake_case"],
        leadingUnderscore: "allow",
      },
      {
        selector: "memberLike",
        modifiers: ["private"],
        format: ["camelCase"],
        leadingUnderscore: "require",
      },
      {
        selector: "typeLike",
        format: ["PascalCase"],
      },
    ],
    "@typescript-eslint/prefer-optional-chain": "error",
    quotes: "off", // disabling eslint and let ts-eslint handle rule
    "@typescript-eslint/quotes": [
      "error",
      "double",
      { allowTemplateLiterals: true, avoidEscape: true },
    ],
    "@typescript-eslint/semi": ["error", "always"],
    "@typescript-eslint/unified-signatures": "error",
    // eslint-plugin-imports
    "import/order": [
      "error",
      {
        groups: [["external", "builtin"], "internal", "parent", "sibling"],
        "newlines-between": "always",
        alphabetize: { order: "asc" },
      },
    ],
    //eslint rules
    indent: ["error", 2],
    quotes: ["error", "double"],
    semi: ["error", "always"],
    radix: "error",
    curly: ["error", "multi-line"],
    eqeqeq: ["error", "always"],
    "arrow-parens": ["off", "as-needed"],
    "dot-notation": "error",
    "guard-for-in": "error",
    "id-match": "error",
    "max-classes-per-file": ["error", 1],
    "newline-per-chained-call": "off",
    "no-bitwise": "error",
    "no-caller": "error",
    "no-console": "warn",
    "no-debugger": "warn",
    "no-empty": "error",
    "no-eval": "error",
    "no-extra-semi": "off",
    "no-fallthrough": "warn",
    "no-irregular-whitespace": "off",
    "no-new-wrappers": "error",
    "no-shadow": [
      "error",
      {
        hoist: "all",
      },
    ],
    "no-throw-literal": "error",
    "no-trailing-spaces": "error",
    "no-undef-init": "error",
    "no-underscore-dangle": "error",
    "no-unused-expressions": ["error", { allowTernary: true }],
    "no-var": "error",
    "object-shorthand": "error",
    "one-var": ["error", "never"],
    "prefer-const": "error",
    "require-await": "off",
    "space-before-function-paren": "off",
    "space-in-parens": ["off", "never"],
    "spaced-comment": "error",
    "valid-typeof": "off",
    "linebreak-style": ["error", "unix"],
    //eslint-plugin-prefer-arrow
    "prefer-arrow/prefer-arrow-functions": [
      "error",
      {
        disallowPrototype: true,
        singleReturnOnly: false,
        classPropertiesAllowed: false,
      },
    ],
  },
};