Function configureServer

packages/plugin-vite/src/plugins/dev_server.ts:22–169

(server)

        publicDir = config.publicDir;
      },
      configureServer(server) {
        // Build the ignore pattern accounting for the configured base path.
        // Vite prefixes virtual module URLs with the base (e.g. /ui/@id/...),
        // so we need to match both /@ and /base/@.
        const base = server.config.base.replace(/\/$/, "");
        const IGNORE_URLS = new RegExp(
          `^(${base})?/(@(vite|fs|id)|\\.vite)/`,
        );

        server.middlewares.use(async (nodeReq, nodeRes, next) => {
          const serverCfg = server.config.server;

          const protocol = serverCfg.https ? "https" : "http";
          const host = serverCfg.host ? serverCfg.host : "localhost";
          const port = serverCfg.port;
          const url = new URL(
            `${protocol}://${host}:${port}${nodeReq.url ?? "/"}`,
          );

          // Don't cache in dev
          url.searchParams.delete(ASSET_CACHE_BUST_KEY);

          // Check if it's a vite url or a node_modules asset (e.g. fonts
          // referenced from CSS in npm packages)
          if (
            IGNORE_URLS.test(url.pathname) ||
            url.pathname.startsWith("/node_modules/") ||
            server.environments.client.moduleGraph.urlToModuleMap.has(
              url.pathname,
            ) ||
            server.environments.ssr.moduleGraph.urlToModuleMap.has(
              url.pathname,
            ) ||
            url.pathname === "/.well-known/appspecific/com.chrome.devtools.json"
          ) {
            return next();
          }

          const decodedPathname = decodeURIComponent(url.pathname.slice(1));

          // Check if it's a static file first.
          // Vite handles publicDir (the first static dir) natively,
          // but we also need to check extra static dirs.
          const extraStaticDirs = freshConfig.staticDir.slice(1);
          const allStaticDirs = [publicDir, ...extraStaticDirs];
          let handledStatic = false;
          for (const dir of allStaticDirs) {
            const staticFilePath = path.join(dir, decodedPathname);
            try {
              const stat = await Deno.stat(staticFilePath);
              if (stat.isFile) {
                if (dir === publicDir) {
                  // Vite serves publicDir files natively
                  return next();
                }
                // Serve files from extra dirs manually
                const file = await Deno.open(staticFilePath, { read: true });
                const { ext } = path.parse(staticFilePath);