.eslintrc.json

{
  "extends": [
    "eslint:recommended",
    "google"
  ],
  "parserOptions": {
    "ecmaVersion": 8,
    "sourceType": "module"
  },
  "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",
      {
        "arrays": "always-multiline",
        "objects": "always-multiline",
        "imports": "always-multiline",
        "exports": "always-multiline",
        "functions": "never"
      }
    ],
    "eol-last": "off",
    "indent": [
      "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
      }
    ],
    "lines-between-class-members": [
      "error",
      "always"
    ],
    "max-len": [
      "error",
      80,
      2,
      {
        "ignoreComments": true,
        "ignorePattern": "^import .*;$"
      }
    ],
    "new-cap": [
      "error",
      {
        "capIsNewExceptions": [
          "Polymer",
          "LegacyElementMixin",
          "GestureEventListeners",
          "LegacyDataMixin"
        ]
      }
    ],
    "no-console": "off",
    "no-multiple-empty-lines": [
      "error",
      {
        "max": 1
      }
    ],
    "no-prototype-builtins": "off",
    "no-redeclare": "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"
    ],
    "padding-line-between-statements": [
      "error",
      {
        "blankLine": "always",
        "prev": "class",
        "next": "*"
      },
      {
        "blankLine": "always",
        "prev": "*",
        "next": "class"
      }
    ],
    "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",
    "require-jsdoc": 0,
    "valid-jsdoc": 0,
    "jsdoc/check-alignment": 2,
    "jsdoc/check-examples": 0,
    "jsdoc/check-indentation": 0,
    "jsdoc/check-param-names": 0,
    "jsdoc/check-syntax": 0,
    "jsdoc/check-tag-names": 0,
    "jsdoc/check-types": 0,
    "jsdoc/implements-on-classes": 2,
    "jsdoc/match-description": 0,
    "jsdoc/newline-after-description": 2,
    "jsdoc/no-types": 0,
    "jsdoc/no-undefined-types": 0,
    "jsdoc/require-description": 0,
    "jsdoc/require-description-complete-sentence": 0,
    "jsdoc/require-example": 0,
    "jsdoc/require-hyphen-before-param-description": 0,
    "jsdoc/require-jsdoc": 0,
    "jsdoc/require-param": 0,
    "jsdoc/require-param-description": 0,
    "jsdoc/require-param-name": 2,
    "jsdoc/require-param-type": 2,
    "jsdoc/require-returns": 0,
    "jsdoc/require-returns-check": 0,
    "jsdoc/require-returns-description": 0,
    "jsdoc/require-returns-type": 2,
    "jsdoc/valid-types": 2,
    "jsdoc/require-file-overview": [
      "error",
      {
        "tags": {
          "license": {
            "mustExist": true,
            "preventDuplicates": true
          }
        }
      }
    ],
    "import/named": 2,
    "import/no-unresolved": 2,
    "import/no-self-import": 2,
    // The no-cycle rule is slow, because it doesn't cache dependencies.
    // Disable it.
    "import/no-cycle": 0,
    "import/no-useless-path-segments": 2,
    "import/no-unused-modules": 2,
    "import/no-default-export": 2
  },
  "plugins": [
    "html",
    "jsdoc",
    "import"
  ],
  "settings": {
    "html/report-bad-indent": "error"
  },
  "overrides": [
    {
      "files": [
        "*_html.js",
        "*-styles.js",
        "externs.js"
      ],
      "rules": {
        "max-len": "off"
      }
    },
    {
      "files": [
        "*.html"
      ],
      "rules": {
        "jsdoc/require-file-overview": "off"
      }
    }
  ]
}