feat(pack): publicPath support runtime (#2245)

* feat(pack): support output.publicPath: runtime

* feat(pack): support output.publicPath: runtime

Author: fireairforce

crates/pack-core/js/src/umd/runtime-base.ts

@@ -21,22 +21,6 @@ declare var TURBOPACK_NEXT_CHUNK_URLS: ChunkUrl[] | undefined;
 declare var CHUNK_BASE_PATH: string;
 declare var CHUNK_SUFFIX_PATH: string;
 
-function normalizeChunkPath(path: string) {
-  if (path.startsWith("/")) {
-    path = path.substring(1);
-  } else if (path.startsWith("./")) {
-    path = path.substring(2);
-  }
-
-  if (!path.endsWith("/")) {
-    path += "/";
-  }
-
-  return path;
-}
-
-const NORMALIZED_CHUNK_BASE_PATH = normalizeChunkPath(CHUNK_BASE_PATH);
-
 interface TurbopackBrowserBaseContext<M> extends TurbopackBaseContext<M> {
   R: ResolvePathFromModule;
 }
@@ -242,7 +226,7 @@ function instantiateRuntimeModule(
  * Returns the URL relative to the origin where a chunk can be fetched from.
  */
 function getChunkRelativeUrl(chunkPath: ChunkPath | ChunkListPath): ChunkUrl {
-  return `${NORMALIZED_CHUNK_BASE_PATH}${chunkPath
+  return `${CHUNK_BASE_PATH}${chunkPath
     .split("/")
     .map((p) => encodeURIComponent(p))
     .join("/")}${CHUNK_SUFFIX_PATH}` as ChunkUrl;

crates/pack-core/src/config.rs

@@ -1426,6 +1426,12 @@ impl Config {
             .and_then(|o| o.public_path.clone())
             .unwrap_or("".into());
 
+        // Special handling for "runtime" value - return a marker that will be
+        // replaced at runtime with window.publicPath
+        if public_path.as_str() == "runtime" {
+            return Ok(Vc::cell("__RUNTIME_PUBLIC_PATH__".into()));
+        }
+
         Ok(Vc::cell(
             format!("{}/", public_path.trim_end_matches("/")).into(),
         ))