.eslintrc.json

{
    "extends": ["eslint:recommended", "google"],
    "parserOptions": {
      "ecmaVersion": 8
    },
    "env": {
      "browser": true,
      "es6": true
    },
    "globals": {
      "__dirname": false,
      "app": false,
      "page": false,
      "Polymer": false,
      "process": false,
      "require": false,
      "Gerrit": false,
      "Promise": false,
      "assert": false,
      "test": false,
      "flushAsynchronousOperations": false
    },
    "rules": {
      "arrow-parens": ["error", "as-needed"],
      "block-spacing": ["error", "always"],
      "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
      "camelcase": "off",
      "comma-dangle": ["error", "always-multiline"],
      "eol-last": "off",
      "indent": "off",
      "indent-legacy": ["error", 2, {
        "MemberExpression": 2,
        "FunctionDeclaration": {"body": 1, "parameters": 2},
        "FunctionExpression": {"body": 1, "parameters": 2},
        "CallExpression": {"arguments": 2},
        "ArrayExpression": 1,
        "ObjectExpression": 1,
        "SwitchCase": 1
      }],
      "keyword-spacing": ["error", { "after": true, "before": true }],
      "max-len": [
        "error",
        80,
        2,
        {"ignoreComments": true}
      ],
      "new-cap": ["error", { "capIsNewExceptions": ["Polymer"] }],
      "no-console": "off",
      "no-restricted-syntax": [
        "error",
        {
          "selector": "ExpressionStatement > CallExpression > MemberExpression[object.name='test'][property.name='only']",
          "message": "Remove test.only."
        },
        {
          "selector": "ExpressionStatement > CallExpression > MemberExpression[object.name='suite'][property.name='only']",
          "message": "Remove suite.only."
        }
      ],
      "no-undef": "off",
      "no-useless-escape": "off",
      "no-var": "error",
      "object-shorthand": ["error", "always"],
      "prefer-arrow-callback": "error",
      "prefer-const": "error",
      "prefer-spread": "error",
      "quote-props": ["error", "consistent-as-needed"],
      "require-jsdoc": "off",
      "semi": [2, "always"],
      "template-curly-spacing": "error",
      "valid-jsdoc": "off"
    },
    "plugins": [
      "html"
    ],
    "settings": {
      "html/report-bad-indent": "error"
    }
  }