.eslintrc build for backend

eslintrc-backend.json

{
  "env": {
    "browser": true,
    "es6": true,
    "jquery": true,
    "node": true,
    "mocha": true
  },
  "extends": "eslint:recommended",
  "parserOptions": {
    "sourceType": "module",
    "ecmaVersion": 2017
  },
  "plugins": [
    "json"
  ],
  "rules": {
    "indent": [
      "error",
      2
    ],
    "keyword-spacing": "error",
    "linebreak-style": "error",
    "quotes": [
      "error",
      "single"
    ],
    "semi": ["error", "never"],
    "space-before-blocks": "error",
    "space-before-function-paren": "error",
    "no-undef": "off",
    "no-unused-vars": "off",
    "comma-dangle": ["error", "always-multiline"]
  }
}