ESLint Config Google

// .eslintrc.js or similar ESLint configuration file
module.exports = {
  "extends": "google",
  "rules": {
    // Additional project-specific rules...
  }
};

const googleConfig = require('eslint-config-google');
// Access the rules object
const rules = googleConfig.rules;

// .eslintrc.js
module.exports = {
  "extends": "google",
  "rules": {
    // Additional, per-project rules...
  }
};

// .eslintrc.js  
module.exports = {
  "extends": ["eslint:recommended", "google"],
  "rules": {
    // Additional, per-project rules...
  }
};

{
  "extends": "google",
  "rules": {
    // Additional, per-project rules...
  }
}

/**
 * Main ESLint configuration object implementing Google JavaScript style guide
 * @type {ESLintConfig}
 */
module.exports = {
  rules: ESLintRules
};

interface ESLintConfig {
  rules: ESLintRules;
}

interface ESLintRules {
  [ruleName: string]: ESLintRuleConfig;
}

type ESLintRuleConfig = 
  | 0 | 1 | 2 
  | "off" | "warn" | "error"
  | [0 | 1 | 2 | "off" | "warn" | "error", ...any[]];

/**
 * Complete ESLint rules configuration from eslint-config-google
 * All rules listed exactly as configured in the source code
 */
rules: {
  // Possible Errors
  "no-cond-assign": 0,
  "no-irregular-whitespace": 2,
  "no-unexpected-multiline": 2,
  "valid-jsdoc": [2, {
    requireParamDescription: false,
    requireReturnDescription: false,
    requireReturn: false,
    prefer: {returns: "return"}
  }],

  // Best Practices  
  "curly": [2, "multi-line"],
  "guard-for-in": 2,
  "no-caller": 2,
  "no-extend-native": 2,
  "no-extra-bind": 2,
  "no-invalid-this": 2,
  "no-multi-spaces": 2,
  "no-multi-str": 2,
  "no-new-wrappers": 2,
  "no-throw-literal": 2,
  "no-with": 2,
  "prefer-promise-reject-errors": 2,

  // Variables
  "no-unused-vars": [2, {args: "none"}],

  // Stylistic Issues
  "array-bracket-newline": 0,
  "array-bracket-spacing": [2, "never"],
  "array-element-newline": 0,
  "block-spacing": [2, "never"],
  "brace-style": 2,
  "camelcase": [2, {properties: "never"}],
  "comma-dangle": [2, "always-multiline"],
  "comma-spacing": 2,
  "comma-style": 2,
  "computed-property-spacing": 2,
  "eol-last": 2,
  "func-call-spacing": 2,
  "indent": [2, 2, {
    "CallExpression": {
      "arguments": 2
    },
    "FunctionDeclaration": {
      "body": 1,
      "parameters": 2
    },
    "FunctionExpression": {
      "body": 1,
      "parameters": 2
    },
    "MemberExpression": 2,
    "ObjectExpression": 1,
    "SwitchCase": 1,
    "ignoredNodes": [
      "ConditionalExpression"
    ]
  }],
  "key-spacing": 2,
  "keyword-spacing": 2,
  "linebreak-style": 2,
  "max-len": [2, {
    code: 80,
    tabWidth: 2,
    ignoreUrls: true,
    ignorePattern: "goog\\.(module|require)"
  }],
  "new-cap": 2,
  "no-array-constructor": 2,
  "no-mixed-spaces-and-tabs": 2,
  "no-multiple-empty-lines": [2, {max: 2}],
  "no-new-object": 2,
  "no-tabs": 2,
  "no-trailing-spaces": 2,
  "object-curly-spacing": 2,
  "one-var": [2, {
    var: "never",
    let: "never",
    const: "never"
  }],
  "operator-linebreak": [2, "after"],
  "padded-blocks": [2, "never"],
  "quote-props": [2, "consistent"],
  "quotes": [2, "single", {allowTemplateLiterals: true}],
  "require-jsdoc": [2, {
    require: {
      FunctionDeclaration: true,
      MethodDefinition: true,
      ClassDeclaration: true
    }
  }],
  "semi": 2,
  "semi-spacing": 2,
  "space-before-blocks": 2,
  "space-before-function-paren": [2, {
    asyncArrow: "always",
    anonymous: "never",
    named: "never"
  }],
  "spaced-comment": [2, "always"],
  "switch-colon-spacing": 2,

  // ECMAScript 6
  "arrow-parens": [2, "always"],
  "constructor-super": 2,
  "generator-star-spacing": [2, "after"],
  "no-new-symbol": 2,
  "no-this-before-super": 2,
  "no-var": 2,
  "prefer-const": [2, {destructuring: "all"}],
  "prefer-rest-params": 2,
  "prefer-spread": 2,
  "rest-spread-spacing": 2,
  "yield-star-spacing": [2, "after"]
}

/**
 * Access individual rule configurations
 * @param {string} ruleName - Name of the ESLint rule
 * @returns {ESLintRuleConfig} Rule configuration
 */
const googleConfig = require('eslint-config-google');
const ruleConfig = googleConfig.rules[ruleName];

// Examples:
const indentRule = googleConfig.rules['indent'];        // [2, 2, {...}]
const quotesRule = googleConfig.rules['quotes'];        // [2, 'single', {...}]
const semiRule = googleConfig.rules['semi'];            // 2

/**
 * ESLint rule severity levels
 */
type ESLintSeverity = 0 | 1 | 2 | "off" | "warn" | "error";

/**
 * ESLint rule configuration
 */
type ESLintRuleConfig = 
  | ESLintSeverity
  | [ESLintSeverity, ...any[]];

/**
 * Complete ESLint rules object
 */
interface ESLintRules {
  [ruleName: string]: ESLintRuleConfig;
}

/**
 * ESLint configuration object structure
 */
interface ESLintConfig {
  rules: ESLintRules;
}

/**
 * Rule-specific option interfaces
 */
interface ValidJSDocOptions {
  requireParamDescription: boolean;
  requireReturnDescription: boolean;
  requireReturn: boolean;
  prefer: { returns: string };
}

interface IndentOptions {
  CallExpression: { arguments: number };
  FunctionDeclaration: { body: number; parameters: number };
  FunctionExpression: { body: number; parameters: number };
  MemberExpression: number;
  ObjectExpression: number;
  SwitchCase: number;
  ignoredNodes: string[];
}

interface MaxLenOptions {
  code: number;
  tabWidth: number;
  ignoreUrls: boolean;
  ignorePattern: string;
}

interface CamelCaseOptions {
  properties: "never";
}

interface OneVarOptions {
  var: "never";
  let: "never";
  const: "never";
}

interface QuotesOptions {
  allowTemplateLiterals: boolean;
}

interface RequireJSDocOptions {
  require: {
    FunctionDeclaration: boolean;
    MethodDefinition: boolean;
    ClassDeclaration: boolean;
  };
}

interface SpaceBeforeFunctionParenOptions {
  asyncArrow: "always";
  anonymous: "never";
  named: "never";
}

interface PreferConstOptions {
  destructuring: "all";
}

interface NoUnusedVarsOptions {
  args: "none";
}