.eslintrc.json

{
  "env": {
    "browser": true,
    "commonjs": true
  },
  "extends": [
    "eslint:recommended"
  ],
  "parserOptions": {
    "ecmaVersion": 5
  },
  "globals" : {
    "Promise": false
  },
  "rules": {
    "array-bracket-spacing": "error",
    "block-scoped-var": "error",
    "brace-style": "error",
    "camelcase": ["error", {"properties": "never"}],
    "comma-dangle": ["error", "always-multiline"],
    "comma-spacing": "error",
    "complexity": ["error", 10],
    "computed-property-spacing": "error",
    "curly": "error",
    "eqeqeq": ["error", "smart"],
    "eol-last": "error",
    "func-call-spacing": "error",
    "indent": ["error", 2],
    "key-spacing": "error",
    "keyword-spacing": "error",
    "linebreak-style": "error",
    "new-cap": "error",
    "no-array-constructor": "error",
    "no-multiple-empty-lines": ["error", {"max": 2}],
    "no-tabs": "error",
    "no-trailing-spaces": "error",
    "object-curly-spacing": "error",
    "padded-blocks": ["error", "never"],
    "quote-props": ["error", "as-needed"],
    "quotes": ["error", "single"],
    "semi": "error",
    "semi-spacing": "error",
    "space-before-blocks": "error",
    "space-before-function-paren": ["error", {
      "anonymous": "never",
      "named": "never"
    }],
    "spaced-comment": ["error", "always"],
    "switch-colon-spacing": "error",
    "unicode-bom": ["error", "never"],
    "valid-jsdoc": ["error", {
      "requireReturn": false
    }]
  },
  "overrides": [{
    "files": ["test/*.js"],
    "env": {
      "mocha": true
    },
    "globals": {
      "chai": false,
      "nise": false,
      "StackdriverErrorReporter": false
    },
    "plugins": [
      "mocha"
    ],
    "rules": {
      "mocha/handle-done-callback": "error",
      "mocha/no-exclusive-tests": "warn",
      "mocha/no-nested-tests": "error",
      "mocha/no-return-and-callback": "error"
    }
  }]
}