vitest.config.ts

import { defineConfig } from 'vitest/config';
import path from 'path';
import { fileURLToPath } from 'url';

// Get __dirname equivalent in ESM
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

export default defineConfig({
  test: {
    globals: true,
    environment: 'happy-dom',
    setupFiles: ['./test-setup.ts'],
    env: {
      TZ: 'UTC', // Force UTC timezone for consistent date handling across all tests
    },
    coverage: {
      provider: 'istanbul',
      reporter: ['lcov', 'text'],
      reportsDirectory: './coverage',
      
      // Only include files that are imported by tests (similar to Bun's behavior)
      // But exclude test files themselves
      exclude: [
        '**/*.test.{ts,tsx}',
        '**/*.spec.{ts,tsx}',
        '__tests__/**',
        '__mocks__/**',
        'test-setup.ts',
        'scripts/**',
        'drizzle/**',
        '*.config.*',
        'coverage/**',
        '.next/**',
        'node_modules/**',
        'instrumentation.ts',
        // Exclude Next.js app files that aren't tested
        'app/**/layout.tsx',
        'app/**/page.tsx',
        'app/**/error.tsx',
        'app/**/not-found.tsx',
        'app/**/global-error.tsx',
        'app/providers.tsx',
      ],
    },
    // Enable parallel execution (this is what we want!)
    pool: 'threads',
    // Isolate tests in separate contexts
    isolate: true,
  },
  resolve: {
    alias: [
      {
        find: /^@\/(.*)$/,
        replacement: path.resolve(__dirname, './$1'),
      },
    ],
  },
  //  Externalize Bun built-in modules so they're not bundled by Vite
  ssr: {
    noExternal: true,
  },
});