refactor: provide 404.html without fs access

examples/01_template/public/404.html

@@ -0,0 +1 @@
+<h1>Not Found 404</h1>

packages/waku/src/lib/vite-entries/entry.server.tsx

@@ -5,9 +5,9 @@ import { flags, config, isBuild } from 'virtual:vite-rsc-waku/config';
 import { compress } from 'hono/compress';
 import { serveStatic } from '@hono/node-server/serve-static';
 import path from 'node:path';
-import fs from 'node:fs';
 import { DIST_PUBLIC } from '../constants.js';
 import { INTERNAL_setAllEnv } from '../../server.js';
+import notFountHtml from 'virtual:vite-rsc-waku/404';
 
 function createApp(app: Hono) {
   INTERNAL_setAllEnv(process.env as any);
@@ -31,9 +31,8 @@ function createApp(app: Hono) {
   }
   app.use(createHonoHandler());
   app.notFound((c) => {
-    const file = path.join(config.distDir, DIST_PUBLIC, '404.html');
-    if (fs.existsSync(file)) {
-      return c.html(fs.readFileSync(file, 'utf8'), 404);
+    if (notFountHtml) {
+      return c.html(notFountHtml, 404);
     }
     return c.text('404 Not Found', 404);
   });

packages/waku/src/lib/vite-rsc/plugin.ts

@@ -328,6 +328,13 @@ if (import.meta.hot) {
         export const isBuild = ${JSON.stringify(this.environment.mode === 'build')};
       `;
     }),
+    createVirtualPlugin('vite-rsc-waku/404', async function () {
+      const notFoundHtmlPath = path.resolve(DIST_PUBLIC, '404.html');
+      if (!fs.existsSync(notFoundHtmlPath)) {
+        return `export default undefined`;
+      }
+      return `export { default } from ${JSON.stringify(notFoundHtmlPath + "?raw")}`;
+    }),
     {
       // rewrite `react-server-dom-webpack` in `waku/minimal/client`
       name: 'rsc:waku:patch-webpack',

packages/waku/src/lib/vite-types.d.ts

@@ -30,3 +30,8 @@ declare module 'virtual:vite-rsc-waku/fallback-html' {
   const default_: string;
   export default default_;
 }
+
+declare module 'virtual:vite-rsc-waku/404' {
+  const default_: string;
+  export default default_;
+}