feat: expose httpServer in RsbuildDevServer

[chenjiahan]

Summary

Expose httpServer in RsbuildDevServer, this can be used to set up the Rspack lazy compilation backend server.

Example:

const lazyCompilationServerPlugin = (): RsbuildPlugin => {
  return {
    name: 'lazy-compilation-server-plugin',
    setup(api) {
      let devServer: RsbuildDevServer;

      api.onBeforeStartDevServer(({ server }) => {
        devServer = server;
      });

      api.modifyRspackConfig((config) => {
        const { httpServer } = devServer || {};
        if (!httpServer) {
          return;
        }

        config.experiments ||= {};
        config.experiments.lazyCompilation = {
          backend: {
            server: () => httpServer,
          },
        };
      });
    },
  };
};

TODO: Consider adding a new server.middlewareMode config to prevent the unnecessary createHttpServer call.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rsbuild ready!

Name	Link
🔨 Latest commit	88b8d17
🔍 Latest deploy log	https://app.netlify.com/sites/rsbuild/deploys/67b091675905eb0008c6be49
😎 Deploy Preview	https://deploy-preview-4570--rsbuild.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 48 (🟢 up 1 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: 60 (no change from production) View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.