Vite Build Optimization Tips

### 1. **Enable `build.sourcemap` Only for Development**
If source maps are not required in production, make sure they're disabled:

// vite.config.js
export default {
  build: {
    sourcemap: false, // Disable source maps in production
  },
};

### 2. **Optimize Dependencies Using `build.rollupOptions`**
If there are some large dependencies that you don't need to bundle, you can exclude them:

// vite.config.js
import { defineConfig } from 'vite';

export default defineConfig({
  build: {
    rollupOptions: {
      external: ['vue'], // List large dependencies you don't want to bundle
    },
  },
});

### 3. **Use `esbuild` for Faster Builds**
Vite uses `esbuild` for transforming JavaScript/TypeScript files, which is faster than traditional bundlers. Make sure to enable esbuild options:

// vite.config.js
export default {
  esbuild: {
    minify: true,
    target: 'esnext',
  },
};

### 4. **Enable `build.terserOptions` for Minification**
Using `terser` can optimize the minification process:

// vite.config.js
export default {
  build: {
    minify: 'terser',
    terserOptions: {
      compress: {
        drop_console: true, // Remove console logs
        drop_debugger: true,
      },
    },
  },
};

### 5. **Cache Node Modules with `node_modules/.vite`**
To speed up builds, Vite caches dependencies in `node_modules/.vite`. Make sure this folder isn't being cleaned up frequently by your Docker setup.

### 6. **Use `build.target` for Modern Browsers**
If you're targeting modern browsers, you can skip transpilation for older JS syntax:

// vite.config.js
export default {
  build: {
    target: 'esnext', // Adjust based on your browser support
  },
};

### 7. **Enable Parallel Builds**
Ensure you're utilizing multiple CPU cores for faster builds:

// vite.config.js
export default {
  build: {
    brotliSize: false, // Disable brotli size computation
  },
  optimizeDeps: {
    force: true, // Force dependencies optimization
  },
};

### 8. **Analyze Bundle Size with `vite-plugin-visualizer`**
To find out what's slowing down your build, use the `vite-plugin-visualizer`:

npm install vite-plugin-visualizer --save-dev

// vite.config.js
import { defineConfig } from 'vite';
import { visualizer } from 'vite-plugin-visualizer';

export default defineConfig({
  plugins: [visualizer()],
});

Run:

npm run build && open dist/stats.html

### 9. **Use Docker Build Caching**
If you're using Docker, ensure your Dockerfile is optimized for build caching:

# Dockerfile

# Install dependencies
RUN npm ci

# Cache the dependencies
COPY . .

# Build the project
RUN npm run build

### 10. **Check Node and Vite Versions**
Make sure you're using the latest stable versions of Node.js and Vite. Since you're using Node.js 21, ensure compatibility with your current Vite version.

### 11. **Use `splitChunks` for Code Splitting**
If you have large bundles, you can split them into smaller chunks:

// vite.config.js
export default {
  build: {
    rollupOptions: {
      output: {
        manualChunks: {
          vendor: ['vue', 'vue-router'],
        },
      },
    },
  },
};

Implementing these optimizations can significantly speed up your Vite build times. Let me know if you have any questions or need further assistance!