How does Rspack support micro-frontend architecture?

Rspack plays an important role in micro-frontend architecture, providing efficient build and deployment support for micro-frontend applications. Here's a detailed explanation of Rspack's application in micro-frontends:

Basic Concepts of Micro-frontends

Micro-frontends is an architectural pattern that splits frontend applications into multiple independent, independently developed and deployable small applications. Each micro-frontend application can:

• Be developed, tested, and deployed independently
• Use different technology stacks
• Run and update independently
• Be combined into a complete application

Advantages of Rspack in Micro-frontends

1. Fast Builds:

   • Rspack's high-performance build capability is particularly suitable for micro-frontend multi-application scenarios
   • Each micro-frontend application can be built independently with short build times
   • Incremental builds further improve efficiency

2. Module Federation:

   • Supports module federation for code sharing between applications
   • Dynamically loads remote modules, reducing duplicate code
   • Improves application load performance

3. Independent Deployment:

   • Each micro-frontend application can be built and deployed independently
   • Supports different build configurations
   • Flexible version management

Module Federation Configuration

Host Application Configuration

javascript
const ModuleFederationPlugin = require('@rspack/core').ModuleFederationPlugin;

module.exports = {
  entry: './src/index.js',
  mode: 'development',
  plugins: [
    new ModuleFederationPlugin({
      name: 'host',
      remotes: {
        app1: 'app1@http://localhost:3001/remoteEntry.js',
        app2: 'app2@http://localhost:3002/remoteEntry.js'
      },
      shared: {
        react: { singleton: true },
        'react-dom': { singleton: true }
      }
    })
  ]
}

Remote Application Configuration

javascript
const ModuleFederationPlugin = require('@rspack/core').ModuleFederationPlugin;

module.exports = {
  entry: './src/index.js',
  mode: 'development',
  plugins: [
    new ModuleFederationPlugin({
      name: 'app1',
      filename: 'remoteEntry.js',
      exposes: {
        './Button': './src/Button',
        './Header': './src/Header'
      },
      shared: {
        react: { singleton: true },
        'react-dom': { singleton: true }
      }
    })
  ]
}

Dynamic Loading of Remote Modules

javascript
// Dynamically load remote modules in Host application
const loadRemoteModule = async (remoteName, moduleName) => {
  const remote = await import(remoteName);
  const module = await remote.get(moduleName);
  return module;
};

// Usage example
const loadApp1Button = async () => {
  const Button = await loadRemoteModule('app1', './Button');
  return Button;
};

Micro-frontend Architecture Patterns

1. Shell Application Pattern

javascript
// Shell application configuration
module.exports = {
  plugins: [
    new ModuleFederationPlugin({
      name: 'shell',
      remotes: {
        dashboard: 'dashboard@http://localhost:3001/remoteEntry.js',
        settings: 'settings@http://localhost:3002/remoteEntry.js',
        profile: 'profile@http://localhost:3003/remoteEntry.js'
      },
      shared: ['react', 'react-dom', 'react-router-dom']
    })
  ]
}

2. Independent Deployment Pattern

Each micro-frontend application is deployed independently, switched through routing or navigation:

javascript
// Route configuration
const routes = [
  {
    path: '/dashboard',
    component: lazy(() => import('dashboard/Dashboard'))
  },
  {
    path: '/settings',
    component: lazy(() => import('settings/Settings'))
  }
];

3. Hybrid Pattern

Combining the advantages of shell application and independent deployment:

javascript
// Core functionality in shell application
// Business functions as independent micro-frontend applications
module.exports = {
  plugins: [
    new ModuleFederationPlugin({
      name: 'main',
      remotes: {
        business1: 'business1@http://localhost:3001/remoteEntry.js',
        business2: 'business2@http://localhost:3002/remoteEntry.js'
      },
      shared: {
        'react': { singleton: true },
        'react-dom': { singleton: true },
        'shared-ui': { singleton: true }
      }
    })
  ]
}

Performance Optimization

1. Code Sharing Optimization

javascript
module.exports = {
  plugins: [
    new ModuleFederationPlugin({
      name: 'app',
      shared: {
        react: {
          singleton: true,
          requiredVersion: '^18.0.0',
          eager: false
        },
        lodash: {
          singleton: false,
          requiredVersion: '^4.17.0'
        }
      }
    })
  ]
}

2. Preloading Strategy

javascript
// Preload remote modules
const preloadRemote = async (remoteName) => {
  await import(remoteName);
};

// Preload when application starts
preloadRemote('app1');
preloadRemote('app2');

3. Caching Strategy

javascript
module.exports = {
  output: {
    filename: '[name].[contenthash].js',
    chunkFilename: '[name].[contenthash].js'
  },
  optimization: {
    runtimeChunk: 'single',
    splitChunks: {
      chunks: 'all',
      cacheGroups: {
        vendors: {
          test: /[\\/]node_modules[\\/]/,
          priority: -10
        }
      }
    }
  }
}

Best Practices

1. Dependency Management:

   • Use shared dependencies to reduce duplicate loading
   • Clearly specify version requirements to avoid compatibility issues
   • Reasonably set eager property

2. Error Handling:

   • Handle remote module loading failures
   • Provide fallback solutions
   • Monitor application status

3. Performance Monitoring:

   • Monitor remote module loading time
   • Optimize loading strategies
   • Analyze application performance

4. Version Management:

   • Use semantic versioning
   • Support multiple versions coexistence
   • Smooth upgrade strategy

5. Development Experience:

   • Use local modules during local development
   • Provide development tool support
   • Simplify debugging process

Real-world Application Scenarios

1. Large Enterprise Applications:

   • Different teams independently develop different modules
   • Unified technology stack and build tools
   • Flexible deployment and updates

2. Multi-tenant Applications:

   • Different tenants use different micro-frontend applications
   • Independent configuration and functionality
   • Unified shell application

3. Progressive Refactoring:

   • Gradually migrate old applications to micro-frontend architecture
   • Maintain business continuity
   • Reduce refactoring risks

Rspack's application in micro-frontend architecture provides developers with efficient and flexible build and deployment solutions. Through module federation and independent deployment, it can achieve true micro-frontend architecture, improving development efficiency and application performance.