import { fileURLToPath } from 'node:url';
import react from '@vitejs/plugin-react';
import { defineConfig } from 'vite';

export default defineConfig(({ mode }) => ({
  plugins: [react()],
  build: {
    rollupOptions: {
      output: {
        // Framework code changes far less often than app code; splitting keeps
        // the vendor chunk cacheable across releases instead of one big bundle.
        manualChunks(id) {
          if (id.includes('node_modules')) return 'vendor';
          return undefined;
        },
      },
    },
  },
  resolve: {
    alias:
      mode === 'test'
        ? [
            {
              find: /^animal-island-ui$/u,
              replacement: fileURLToPath(
                new URL('./node_modules/animal-island-ui/dist/cjs/index.cjs', import.meta.url),
              ),
            },
          ]
        : [],
  },
}));