.eslintrc.js

module.exports = {
  env: {
    browser: true,
    es2021: true,
    node: true,
    jest: true
  },
  extends: [
    'eslint:recommended',
    'plugin:prettier/recommended'
  ],
  parserOptions: {
    ecmaVersion: 'latest',
    sourceType: 'module',
    ecmaFeatures: {
      jsx: false
    }
  },
  plugins: ['prettier'],
  rules: {
    'prettier/prettier': 'error',
    'no-unused-vars': ['warn', {
      argsIgnorePattern: '^_',
      varsIgnorePattern: '^_'
    }],
    'no-console': 'off',
    'prefer-const': 'error',
    'no-var': 'error',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'warn',
    'no-alert': process.env.NODE_ENV === 'production' ? 'error' : 'warn',
    'no-empty': ['error', { allowEmptyCatch: true }],
    'no-duplicate-imports': 'error',
    'prefer-template': 'error',
    'template-curly-spacing': 'error',
    'arrow-spacing': 'error',
    'comma-dangle': ['error', 'only-multiline'],
    'quotes': ['error', 'single', { avoidEscape: true }],
    'semi': ['error', 'always'],
    'indent': ['error', 2, { SwitchCase: 1 }],
    'brace-style': ['error', '1tbs', { allowSingleLine: true }],
    'object-curly-spacing': ['error', 'always'],
    'array-bracket-spacing': ['error', 'never'],
    'computed-property-spacing': ['error', 'never'],
    'func-call-spacing': ['error', 'never'],
    'key-spacing': ['error', { beforeColon: false, afterColon: true }],
    'keyword-spacing': ['error', { before: true, after: true }],
    'space-before-blocks': ['error', 'always'],
    'space-before-function-paren': ['error', 'never'],
    'space-in-parens': ['error', 'never'],
    'space-infix-ops': 'error',
    'space-unary-ops': 'error',
    'spaced-comment': ['error', 'always'],
    'no-trailing-spaces': 'error',
    'no-multiple-empty-lines': ['error', { max: 2, maxEOF: 1 }],
    'eol-last': ['error', 'always'],
    'linebreak-style': ['error', 'unix'],
    'max-len': ['error', { code: 100, ignoreUrls: true, ignoreStrings: true }],
    'complexity': ['warn', 10],
    'max-depth': ['warn', 4],
    'max-params': ['warn', 4],
    'max-statements': ['warn', 20],
    'no-magic-numbers': ['warn', {
      ignore: [-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 16, 32, 64, 100, 1000],
      ignoreArrayIndexes: true,
      ignoreDefaultValues: true
    }],
    'no-param-reassign': ['error', { props: false }],
    'prefer-arrow-callback': 'error',
    'arrow-body-style': ['error', 'as-needed'],
    'no-useless-constructor': 'error',
    'no-useless-return': 'error',
    'prefer-destructuring': ['error', {
      VariableDeclarator: { array: false, object: true },
      AssignmentExpression: { array: false, object: false }
    }],
    'object-shorthand': 'error',
    'prefer-spread': 'error'
  },
  overrides: [
    {
      files: ['*.test.js', '**/__tests__/**/*.js'],
      env: {
        jest: true
      },
      rules: {
        'no-magic-numbers': 'off',
        'max-statements': 'off'
      }
    },
    {
      files: ['webpack.config.js', 'babel.config.js', 'jest.config.js'],
      env: {
        node: true
      }
    }
  ],
  settings: {
    'import/resolver': {
      alias: {
        map: [
          ['@', './src'],
          ['@engine', './src/engine.js'],
          ['@renderer', './src/renderer.js'],
          ['@scene', './src/scene.js'],
          ['@input', './src/input.js'],
          ['@physics', './src/physics.js'],
          ['@audio', './src/audio.js'],
          ['@ai', './src/ai.js'],
          ['@network', './src/network.js'],
          ['@ui', './src/ui.js'],
          ['@animation', './src/animation-system.js']
        ],
        extensions: ['.js', '.json']
      }
    }
  }
};