fix: try adding .txt extension to built RSC Payload

Author: uhyo

packages/docs/src/pages/api/Defer.mdx

@@ -85,7 +85,7 @@ const routes = [
 
 ## How It Works
 
-By default, FUNSTACK Static puts the entire app (`<App />`) into one RSC payload (`/.funstack/index.rsc`). The client fetches this payload to render your SPA.
+By default, FUNSTACK Static puts the entire app (`<App />`) into one RSC payload (`/.funstack/index.txt`). The client fetches this payload to render your SPA.
 
 When you use `defer(Component)`, FUNSTACK Static creates **additional RSC payloads** for the rendering result of `<Component />`. This results in an additional emit of RSC payload files like `/.funstack/rsc/fun:rsc-payload/b5698be72eea3c37`.
 

packages/static/src/build/rscPath.ts

@@ -1,4 +1,4 @@
 /**
  * Path to RSC payload in build output
  */
-export const rscPayloadPath = "/.funstack/index.rsc";
+export const rscPayloadPath = "/.funstack/index.txt";

packages/static/src/rsc/rscModule.ts

@@ -12,16 +12,23 @@ export function getPayloadIDFor(rawId: string): string {
 }
 
 const rscModulePathPrefix = "/.funstack/rsc/";
+const rscModulePathSuffix = ".txt";
 
 export function getModulePathFor(id: string): string {
-  return `${rscModulePathPrefix}${id}`;
+  return `${rscModulePathPrefix}${id}${rscModulePathSuffix}`;
 }
 
 export function extractIDFromModulePath(
   modulePath: string,
 ): string | undefined {
-  if (!modulePath.startsWith(rscModulePathPrefix)) {
+  if (
+    !modulePath.startsWith(rscModulePathPrefix) ||
+    !modulePath.endsWith(rscModulePathSuffix)
+  ) {
     return undefined;
   }
-  return modulePath.slice(rscModulePathPrefix.length);
+  return modulePath.slice(
+    rscModulePathPrefix.length,
+    -rscModulePathSuffix.length,
+  );
 }