import { defineConfig } from 'vitest/config';
import react from '@vitejs/plugin-react';

export default defineConfig({
  plugins: [react()],
  test: {
    environment: 'jsdom',
    setupFiles: ['./tests/setup.ts'],
    include: ['./tests/unit/**/*.test.{ts,tsx}'],
    restoreMocks: true,
    clearMocks: true,
    coverage: {
      provider: 'v8',
      reporter: ['text', 'json-summary'],
      include: ['src/MetricWidgets.tsx', 'src/systemStatus.ts'],
    },
  },
  build: {
    rollupOptions: {
      output: {
        // The React runtime is stable across deploys and shared by every route,
        // so it is worth its own long-lived chunk. Route-level splitting is
        // driven by React.lazy in App.tsx.
        manualChunks(id: string) {
          if (id.includes('/node_modules/react-dom/') || id.includes('/node_modules/react/') || id.includes('/node_modules/scheduler/')) return 'react-vendor';
          return undefined;
        },
      },
    },
  },
});