/**
 * Shared ESLint configuration
 * Python-like JavaScript: prefer functional patterns, minimal syntax
 */
module.exports = {
  env: {
    browser: true,
    es2021: true,
    node: true,
  },
  extends: [
    'eslint:recommended',
    'prettier', // Must be last to override other configs
  ],
  plugins: ['import'],
  parserOptions: {
    ecmaVersion: 'latest',
    sourceType: 'module',
  },
  rules: {
    // Python-like patterns
    'no-unused-vars': ['error', { argsIgnorePattern: '^_' }], // Like Python's _
    'prefer-arrow-callback': 'error', // Lambda-like functions
    'prefer-const': 'error', // Immutability by default
    'prefer-destructuring': ['error', {
      array: true,
      object: true,
    }], // Like Python unpacking
    'prefer-template': 'error', // Template literals over concatenation
    'object-shorthand': 'error', // Concise object syntax
    'arrow-body-style': ['error', 'as-needed'], // Minimal arrow function syntax

    // ASI-friendly rules for semicolon-free style
    'no-unexpected-multiline': 'error',
    'semi': ['error', 'never'], // Enforce no semicolons

    // Import organization (like Python)
    'import/order': ['error', {
      groups: [
        'builtin', // Node built-in modules
        'external', // npm packages
        'internal', // internal aliases
        'parent', // parent directories
        'sibling', // sibling files
        'index', // index files
      ],
      'newlines-between': 'always',
      alphabetize: { order: 'asc' },
    }],
    'import/newline-after-import': 'error',
    'import/no-duplicates': 'error',

    // Environment-specific
    'no-console': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
  },
}