eslint.config.js

import js from '@eslint/js';
import tseslint from '@typescript-eslint/eslint-plugin';
import tsParser from '@typescript-eslint/parser';
import importPlugin from 'eslint-plugin-import';

export default [
  {
    files: ['src/**/*.ts'],
    languageOptions: {
      parser: tsParser,
      parserOptions: {
        ecmaVersion: 2022,
        sourceType: 'module',
        project: './tsconfig.json',
      },
    },
    plugins: {
      '@typescript-eslint': tseslint,
      'import': importPlugin,
    },
    rules: {
      ...js.configs.recommended.rules,
      ...tseslint.configs.recommended.rules,
      
      // Align with project's TypeScript strict mode
      '@typescript-eslint/no-unused-vars': 'error',
      '@typescript-eslint/no-explicit-any': 'error',
      '@typescript-eslint/explicit-function-return-type': ['warn', {
        allowExpressions: true,
        allowTypedFunctionExpressions: true,
      }],
      
      // Align with code style guidelines
      'prefer-const': 'error',
      'no-var': 'error',
      'semi': ['error', 'always'],
      'quotes': ['error', 'single', { avoidEscape: true }],
      'indent': ['error', 2, { SwitchCase: 1 }],
      'import/order': ['error', {
        'groups': ['builtin', 'external', 'internal', 'parent', 'sibling', 'index'],
        'newlines-between': 'always'
      }],
      'sort-imports': ['error', {
        'ignoreDeclarationSort': true
      }],
      
      // 'no-undef' duplicates a check TypeScript already enforces, and its
      // lexical-only analysis miscalls Node globals like URLSearchParams.
      // Per typescript-eslint ("strongly recommend that you do not use the
      // no-undef lint rule on TypeScript projects" -
      // https://typescript-eslint.io/troubleshooting/faqs/eslint/) and
      // ESLint's own 'Handled by TypeScript' note for the rule.
      'no-undef': 'off',

      // Keep it simple - disable overly strict rules
      '@typescript-eslint/no-non-null-assertion': 'off',
      '@typescript-eslint/no-unused-expressions': 'off',
    },
  },
  {
    files: ['*.js', '*.mjs'],
    languageOptions: {
      ecmaVersion: 2022,
      sourceType: 'module',
    },
    rules: js.configs.recommended.rules,
  },
];