fix: route GitHub Pages navigation to static RSC files

packages/app/src/lib/mock-api.ts

@@ -658,10 +658,41 @@ function mockResponse(url: URL, method: string, init?: RequestInit): Response {
   )
 }
 
-function normalizeStaticRscResponse(url: URL, response: Response): Response {
+function staticRscRequestUrl(
+  input: RequestInfo | URL,
+  init: RequestInit | undefined,
+  url: URL,
+): URL | null {
+  if (
+    url.origin !== window.location.origin ||
+    (DEMO_BASE_PATH !== '' &&
+      url.pathname !== DEMO_BASE_PATH &&
+      !url.pathname.startsWith(`${DEMO_BASE_PATH}/`))
+  ) {
+    return null
+  }
+
+  const headers = new Headers(input instanceof Request ? input.headers : {})
+  new Headers(init?.headers).forEach((value, name) => headers.set(name, value))
+  if (
+    headers.get('RSC') !== '1' &&
+    !headers.get('Accept')?.includes('text/x-component')
+  ) {
+    return null
+  }
+
+  const staticUrl = new URL(url)
+  if (!staticUrl.pathname.endsWith('.rsc')) {
+    staticUrl.pathname = staticUrl.pathname.endsWith('/')
+      ? `${staticUrl.pathname}index.rsc`
+      : `${staticUrl.pathname}.rsc`
+  }
+  return staticUrl
+}
+
+function normalizeStaticRscResponse(response: Response): Response {
   if (
     !response.ok ||
-    !url.pathname.endsWith('.rsc') ||
     response.headers.get('Content-Type')?.startsWith('text/x-component')
   ) {
     return response
@@ -698,7 +729,12 @@ export function installMockApi(): void {
     ) {
       return mockResponse(url, method, init)
     }
-    return normalizeStaticRscResponse(url, await nativeFetch(input, init))
+    const staticRscUrl = staticRscRequestUrl(input, init, url)
+    if (staticRscUrl === null) return nativeFetch(input, init)
+
+    const staticInput =
+      input instanceof Request ? new Request(staticRscUrl, input) : staticRscUrl
+    return normalizeStaticRscResponse(await nativeFetch(staticInput, init))
   }
 }