Optimization suggestions for large-scale projects

Optimizing Build Speed

Vite.js build speed can become a bottleneck in large projects. The following methods can significantly improve build performance:

1. Dependency Pre-Build Optimization:

// vite.config.js
export default defineConfig({
  optimizeDeps: {
    include: ['lodash-es', 'axios'],
    exclude: ['vue-demi']
  }
})

• Explicitly include frequently used dependencies
• Exclude libraries that don't require pre-building
• Use force: true to force re-pre-building

2. Multi-threading Processing:

npm install -D vite-plugin-parallel

import { parallelPlugin } from 'vite-plugin-parallel'

export default defineConfig({
  plugins: [
    parallelPlugin({
      build: {
        transformThreads: 4
      }
    })
  ]
})

3. Cache Strategy:

export default defineConfig({
  cacheDir: './.vite_cache',
  build: {
    cache: true
  }
})

Code Splitting Strategy

Reasonable code splitting can significantly improve loading performance for large applications:

1. Dynamic Component Import:

const UserProfile = defineAsyncComponent(() => 
  import('./components/UserProfile.vue')
)

2. Route-Level Splitting:

const routes = [
  {
    path: '/dashboard',
    component: () => import('./views/Dashboard.vue'),
    meta: { preload: true }
  }
]

3. Manual Chunk Configuration:

export default defineConfig({
  build: {
    rollupOptions: {
      output: {
        manualChunks(id) {
          if (id.includes('node_modules')) {
            if (id.includes('lodash')) {
              return 'vendor-lodash'
            }
            return 'vendor'
          }
        }
      }
    }
  }
})

Static Asset Handling

Large projects typically contain numerous static assets:

1. Image Compression Pipeline:

import viteImagemin from 'vite-plugin-imagemin'

export default defineConfig({
  plugins: [
    viteImagemin({
      gifsicle: { optimizationLevel: 7 },
      pngquant: { quality: [0.8, 0.9] }
    })
  ]
})

2. Font File Handling:

export default defineConfig({
  assetsInclude: ['**/*.woff2', '**/*.ttf'],
  build: {
    assetsInlineLimit: 4096 // Files under 4KB converted to base64
  }
})

3. CDN Acceleration Configuration:

export default defineConfig({
  base: 'https://cdn.yourdomain.com/assets/',
  build: {
    assetsDir: 'static/v2'
  }
})

Development Experience Optimization

Improving collaboration efficiency for large teams:

1. HMR Hot Module Replacement Configuration:

export default defineConfig({
  server: {
    hmr: {
      overlay: false,
      protocol: 'ws',
      host: 'localhost'
    }
  }
})

2. Environment Variable Management:

// .env.development
VITE_API_BASE=https://dev-api.example.com
VITE_DEBUG_MODE=true

// vite.config.js
export default defineConfig({
  define: {
    __APP_VERSION__: JSON.stringify(process.env.npm_package_version)
  }
})

3. Custom Middleware:

export default defineConfig({
  server: {
    middlewareMode: true,
    fs: {
      strict: false
    }
  },
  plugins: [
    {
      name: 'custom-middleware',
      configureServer(server) {
        server.middlewares.use('/api', customApiMiddleware)
      }
    }
  ]
})

Production Environment Optimization

Special optimization strategies for production environments:

1. Critical Path Pre-Rendering:

import { createServer } from 'vite'
import { prerender } from 'vite-plugin-prerender'

const server = await createServer({
  plugins: [
    prerender({
      routes: ['/', '/about', '/contact']
    })
  ]
})

2. Server-Side Rendering Configuration:

export default defineConfig({
  ssr: {
    noExternal: ['vue', 'vue-router'],
    external: ['lodash']
  }
})

3. Performance Analysis Tools:

export default defineConfig({
  plugins: [
    visualizer({
      open: true,
      gzipSize: true,
      brotliSize: true
    })
  ]
})

Type System Integration

Type safety is crucial for large projects:

1. TypeScript Configuration Optimization:

export default defineConfig({
  plugins: [
    checker({
      typescript: {
        tsconfigPath: './tsconfig.strict.json'
      }
    })
  ]
})

2. Type Checking Acceleration:

// tsconfig.json
{
  "compilerOptions": {
    "skipLibCheck": true,
    "isolatedModules": true
  }
}

3. Vue TypeScript Support:

// vite.config.js
import vue from '@vitejs/plugin-vue'

export default defineConfig({
  plugins: [
    vue({
      script: {
        defineModel: true,
        propsDestructure: true
      }
    })
  ]
})

Monitoring and Error Handling

Ensuring production environment stability:

1. Error Tracking Integration:

import { sentryVitePlugin } from '@sentry/vite-plugin'

export default defineConfig({
  plugins: [
    sentryVitePlugin({
      org: 'your-org',
      project: 'your-project',
      authToken: process.env.SENTRY_AUTH_TOKEN
    })
  ]
})

2. Performance Monitoring:

// main.js
import { init } from '@web-vitals/attribution'

init({
  analyticsId: 'UA-XXXXX-Y',
  debug: false
})

3. Custom Error Handling:

// errorHandler.js
export function setupErrorHandling(app) {
  app.config.errorHandler = (err, vm, info) => {
    logErrorToService(err, {
      component: vm?.$options.name,
      lifecycleHook: info
    })
  }
}

Multi-Environment Configuration

Configuration management for complex environments:

1. Environment-Specific Configuration:

// vite.config.js
export default defineConfig(({ command, mode }) => {
  const env = loadEnv(mode, process.cwd(), '')
  
  return {
    define: {
      __APP_ENV__: JSON.stringify(env.APP_ENV)
    }
  }
})

2. Multi-Page Application Configuration:

export default defineConfig({
  build: {
    rollupOptions: {
      input: {
        main: resolve(__dirname, 'index.html'),
        admin: resolve(__dirname, 'admin.html')
      }
    }
  }
})

3. Micro-Frontend Integration:

export default defineConfig({
  base: 'http://localhost:5001',
  server: {
    cors: true,
    origin: 'http://localhost:5000'
  }
})

Dependency Management Strategy

Dependency management techniques for large projects:

1. Dependency Version Locking:

export default defineConfig({
  optimizeDeps: {
    holdUntilCrawlEnd: false,
    disabled: false
  }
})

2. Externalizing Dependencies:

export default defineConfig({
  build: {
    rollupOptions: {
      external: ['react', 'react-dom']
    }
  }
})

3. Dependency Analysis Tools:

npx vite-bundle-visualizer

Custom Plugin Development

Developing plugins for project-specific needs:

1. Simple Plugin Example:

export default function myPlugin() {
  return {
    name: 'transform-file',
    transform(code, id) {
      if (id.endsWith('.custom')) {
        return { code: code.replace(/foo/g, 'bar') }
      }
    }
  }
}

2. Virtual File Handling:

export default function virtualPlugin() {
  const virtualModuleId = 'virtual:config'
  
  return {
    name: 'virtual-plugin',
    resolveId(id) {
      if (id === virtualModuleId) {
        return virtualModuleId
      }
    },
    load(id) {
      if (id === virtualModuleId) {
        return `export const config = ${JSON.stringify(loadConfig())}`
      }
    }
  }
}

3. Build Hook Utilization:

export default function timingPlugin() {
  let startTime
  
  return {
    name: 'timing-plugin',
    buildStart() {
      startTime = Date.now()
    },
    buildEnd() {
      console.log(`Build took ${Date.now() - startTime}ms`)
    }
  }
}