module.exports = {
env: {
node: true,
es2022: true,
},
extends: [
'eslint:recommended',
'prettier',
],
plugins: ['prettier'],
parserOptions: {
ecmaVersion: 2022,
sourceType: 'module',
},
rules: {
// Prettier integration
'prettier/prettier': 'error',
// Code quality
'no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
'no-console': ['warn', { allow: ['warn', 'error'] }],
'no-debugger': 'error',
'no-alert': 'error',
// Best practices
'eqeqeq': ['error', 'always'],
'curly': ['error', 'all'],
'no-eval': 'error',
'no-implied-eval': 'error',
'no-new-func': 'error',
'no-script-url': 'error',
'no-multi-str': 'error',
'no-new-wrappers': 'error',
'no-new': 'error',
'no-undef-init': 'error',
'no-undefined': 'off', // Allow undefined
'no-use-before-define': ['error', { functions: false }],
// ES6+
'prefer-const': 'error',
'no-var': 'error',
'prefer-arrow-callback': 'error',
'prefer-template': 'error',
'object-shorthand': 'error',
'prefer-destructuring': ['error', {
array: true,
object: true,
}, {
enforceForRenamedProperties: false,
}],
// Async/Await
'require-await': 'error',
'no-async-promise-executor': 'error',
'no-await-in-loop': 'warn',
// Imports
'no-duplicate-imports': 'error',
// Node.js specific
'no-process-exit': 'error',
'global-require': 'error',
'handle-callback-err': 'error',
// Security
'no-new-require': 'error',
'no-path-concat': 'error',
// Stylistic (handled by Prettier, but some logical rules)
'consistent-return': 'error',
'default-case': 'error',
'dot-notation': 'error',
'no-else-return': 'error',
'no-empty-function': 'error',
'no-lone-blocks': 'error',
'no-magic-numbers': ['warn', {
ignore: [-1, 0, 1, 2],
ignoreArrayIndexes: true,
enforceConst: true,
detectObjects: false,
}],
'no-return-assign': 'error',
'no-useless-concat': 'error',
'prefer-regex-literals': 'error',
'yoda': 'error',
// Variables
'init-declarations': 'off',
'no-catch-shadow': 'off',
'no-shadow': 'error',
'no-undef': 'error',
'no-unused-expressions': 'error',
// Complexity
'complexity': ['warn', 10],
'max-depth': ['warn', 4],
'max-nested-callbacks': ['warn', 3],
'max-params': ['warn', 4],
'max-statements': ['warn', 15],
},
overrides: [
// Test files
{
files: ['**/*.test.js', '**/*.spec.js', '**/test/**/*.js'],
env: {
jest: true,
mocha: true,
},
rules: {
'no-magic-numbers': 'off',
'max-statements': 'off',
'max-nested-callbacks': 'off',
},
},
// Configuration files
{
files: ['*.config.js', '.eslintrc.js'],
rules: {
'no-console': 'off',
},
},
// MCP Server specific
{
files: ['mcp-server/**/*.js'],
rules: {
'no-console': ['warn', { allow: ['error'] }], // Allow console.error for MCP logging
'require-await': 'off', // MCP handlers might not always need await
},
},
],
};
