.eslintrc.json

{
  "env": {
    "mocha": true,
    "node": true,
    "es6": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:array-func/recommended"
  ],
  "plugins": [
    "mocha",
    "prefer-arrow"
  ],
  "parserOptions": {
    "ecmaVersion": 2017
  },
  "rules": {
    "max-len": [
      1,
      {
        "code": 120,
        "tabWidth": 2
      }
    ],
    "mocha/no-exclusive-tests": "error",
    "mocha/no-identical-title": "error",
    "mocha/no-nested-tests": "error",
    "semi": [
      2,
      "always"
    ],
    "quotes": [
      "error",
      "single",
      {
        "avoidEscape": true,
        "allowTemplateLiterals": true
      }
    ]
  },
  "overrides": [
    {
      "files": [
        "test/*.ts"
      ],
      "parser": "@typescript-eslint/parser",
      "plugins": [
        "@typescript-eslint"
      ],
      "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended"
      ],
      "rules": {
        "no-extra-parens": "off"
      }
    },
    {
      "files": [
        "scripts/publish-packages.js"
      ],
      "parserOptions": {
        "ecmaVersion": 2018
      }
    }
  ]
}