diff --git a/crates/turbopack-build/src/chunking_context.rs b/crates/turbopack-build/src/chunking_context.rs
index 5ada231b4a6c37..ca2d81bf352968 100644
--- a/crates/turbopack-build/src/chunking_context.rs
+++ b/crates/turbopack-build/src/chunking_context.rs
@@ -114,7 +114,7 @@ impl BuildChunkingContextVc {
     /// * exports the result of evaluating the given module as a CommonJS
     ///   default export.
     #[turbo_tasks::function]
-    pub async fn generate_entry_chunk(
+    pub async fn entry_chunk(
         self_vc: BuildChunkingContextVc,
         path: FileSystemPathVc,
         module: EcmascriptChunkPlaceableVc,
@@ -129,7 +129,6 @@ impl BuildChunkingContextVc {
         let asset = EcmascriptBuildNodeEntryChunkVc::new(
             path,
             self_vc,
-            entry_chunk,
             AssetsVc::cell(other_chunks),
             evaluatable_assets,
             module,
diff --git a/crates/turbopack-build/src/ecmascript/node/entry/chunk.rs b/crates/turbopack-build/src/ecmascript/node/entry/chunk.rs
index f1f747d952dda1..2b573d8a18c14b 100644
--- a/crates/turbopack-build/src/ecmascript/node/entry/chunk.rs
+++ b/crates/turbopack-build/src/ecmascript/node/entry/chunk.rs
@@ -6,7 +6,7 @@ use turbo_tasks::{primitives::StringVc, ValueToString, ValueToStringVc};
 use turbo_tasks_fs::{File, FileSystemPathVc};
 use turbopack_core::{
     asset::{Asset, AssetContentVc, AssetVc, AssetsVc},
-    chunk::{ChunkVc, ChunkingContext, EvaluatableAssetsVc},
+    chunk::{ChunkingContext, EvaluatableAssetsVc},
     code_builder::{CodeBuilder, CodeVc},
     ident::AssetIdentVc,
     reference::{AssetReferencesVc, SingleAssetReferenceVc},
@@ -28,7 +28,6 @@ use crate::BuildChunkingContextVc;
 pub(crate) struct EcmascriptBuildNodeEntryChunk {
     path: FileSystemPathVc,
     chunking_context: BuildChunkingContextVc,
-    entry_chunk: ChunkVc,
     other_chunks: AssetsVc,
     evaluatable_assets: EvaluatableAssetsVc,
     exported_module: EcmascriptChunkPlaceableVc,
@@ -41,7 +40,6 @@ impl EcmascriptBuildNodeEntryChunkVc {
     pub fn new(
         path: FileSystemPathVc,
         chunking_context: BuildChunkingContextVc,
-        entry_chunk: ChunkVc,
         other_chunks: AssetsVc,
         evaluatable_assets: EvaluatableAssetsVc,
         exported_module: EcmascriptChunkPlaceableVc,
@@ -49,7 +47,6 @@ impl EcmascriptBuildNodeEntryChunkVc {
         EcmascriptBuildNodeEntryChunk {
             path,
             chunking_context,
-            entry_chunk,
             other_chunks,
             evaluatable_assets,
             exported_module,
diff --git a/crates/turbopack-css/src/chunk/mod.rs b/crates/turbopack-css/src/chunk/mod.rs
index 8d4efc0dfcdc51..6c3730243f21ae 100644
--- a/crates/turbopack-css/src/chunk/mod.rs
+++ b/crates/turbopack-css/src/chunk/mod.rs
@@ -12,7 +12,7 @@ use turbopack_core::{
     asset::{Asset, AssetContentVc, AssetVc, AssetsVc},
     chunk::{
         availability_info::AvailabilityInfo, chunk_content, chunk_content_split, Chunk,
-        ChunkContentResult, ChunkGroupReferenceVc, ChunkItem, ChunkItemVc, ChunkVc,
+        ChunkContentResult, ChunkGroupReferenceVc, ChunkItem, ChunkItemVc, ChunkVc, ChunkableAsset,
         ChunkableAssetVc, ChunkingContext, ChunkingContextVc, ChunksVc, FromChunkableAsset,
         ModuleId, ModuleIdVc, ModuleIdsVc, OutputChunk, OutputChunkRuntimeInfo,
         OutputChunkRuntimeInfoVc, OutputChunkVc,
@@ -467,7 +467,7 @@ impl CssChunkContextVc {
 }
 
 #[turbo_tasks::value_trait]
-pub trait CssChunkPlaceable: Asset {
+pub trait CssChunkPlaceable: ChunkableAsset + Asset {
     fn as_chunk_item(&self, context: ChunkingContextVc) -> CssChunkItemVc;
 }
 
diff --git a/crates/turbopack-dev/src/chunking_context.rs b/crates/turbopack-dev/src/chunking_context.rs
index dcf68b406dbef1..95423958b67f1f 100644
--- a/crates/turbopack-dev/src/chunking_context.rs
+++ b/crates/turbopack-dev/src/chunking_context.rs
@@ -41,6 +41,12 @@ impl DevChunkingContextBuilder {
         self
     }
 
+    pub fn chunk_base_path(mut self, chunk_base_path: &str) -> Self {
+        self.context.chunk_base_path =
+            (!chunk_base_path.is_empty()).then(|| chunk_base_path.to_string());
+        self
+    }
+
     pub fn layer(mut self, layer: &str) -> Self {
         self.context.layer = (!layer.is_empty()).then(|| layer.to_string());
         self
@@ -61,8 +67,8 @@ impl DevChunkingContextBuilder {
         self
     }
 
-    pub fn build(self) -> ChunkingContextVc {
-        DevChunkingContextVc::new(Value::new(self.context)).into()
+    pub fn build(self) -> DevChunkingContextVc {
+        DevChunkingContextVc::new(Value::new(self.context))
     }
 }
 
@@ -87,6 +93,9 @@ pub struct DevChunkingContext {
     reference_css_chunk_source_maps: bool,
     /// Static assets are placed at this path
     asset_root_path: FileSystemPathVc,
+    /// Base path that will be prepended to all chunk URLs when loading them.
+    /// This path will not appear in chunk paths or chunk data.
+    chunk_base_path: Option<String>,
     /// Layer name within this context
     layer: Option<String>,
     /// Enable HMR for this chunking
@@ -113,6 +122,7 @@ impl DevChunkingContextVc {
                 reference_chunk_source_maps: true,
                 reference_css_chunk_source_maps: true,
                 asset_root_path,
+                chunk_base_path: None,
                 layer: None,
                 enable_hot_module_replacement: false,
                 environment,
@@ -130,6 +140,11 @@ impl DevChunkingContext {
     pub fn runtime_type(&self) -> RuntimeType {
         self.runtime_type
     }
+
+    /// Returns the chunk public path.
+    pub fn chunk_base_path(&self) -> Option<&String> {
+        self.chunk_base_path.as_ref()
+    }
 }
 
 #[turbo_tasks::value_impl]
@@ -203,17 +218,18 @@ impl ChunkingContext for DevChunkingContext {
 
     #[turbo_tasks::function]
     async fn reference_chunk_source_maps(&self, chunk: AssetVc) -> Result<BoolVc> {
-        let mut source_maps = self.reference_chunk_source_maps;
-        let path = chunk.ident().path().await?;
-        let extension = path.extension().unwrap_or_default();
-        #[allow(clippy::single_match, reason = "future extensions")]
-        match extension {
-            ".css" => {
-                source_maps = self.reference_css_chunk_source_maps;
-            }
-            _ => {}
-        }
-        Ok(BoolVc::cell(source_maps))
+        return Ok(BoolVc::cell(false));
+        // let mut source_maps = self.reference_chunk_source_maps;
+        // let path = chunk.ident().path().await?;
+        // let extension = path.extension().unwrap_or_default();
+        // #[allow(clippy::single_match, reason = "future extensions")]
+        // match extension {
+        //     ".css" => {
+        //         source_maps = self.reference_css_chunk_source_maps;
+        //     }
+        //     _ => {}
+        // }
+        // Ok(BoolVc::cell(source_maps))
     }
 
     #[turbo_tasks::function]
diff --git a/crates/turbopack-dev/src/ecmascript/evaluate/chunk.rs b/crates/turbopack-dev/src/ecmascript/evaluate/chunk.rs
index 3dd90e16f9ddc6..3e2fad515ca755 100644
--- a/crates/turbopack-dev/src/ecmascript/evaluate/chunk.rs
+++ b/crates/turbopack-dev/src/ecmascript/evaluate/chunk.rs
@@ -3,7 +3,10 @@ use std::io::Write;
 use anyhow::{bail, Result};
 use indoc::writedoc;
 use serde::Serialize;
-use turbo_tasks::{primitives::StringVc, TryJoinIterExt, Value, ValueToString, ValueToStringVc};
+use turbo_tasks::{
+    primitives::{OptionStringVc, StringVc},
+    TryJoinIterExt, Value, ValueToString, ValueToStringVc,
+};
 use turbo_tasks_fs::File;
 use turbopack_core::{
     asset::{Asset, AssetContentVc, AssetVc, AssetsVc},
@@ -67,6 +70,7 @@ impl EcmascriptDevEvaluateChunkVc {
     #[turbo_tasks::function]
     async fn code(self) -> Result<CodeVc> {
         let this = self.await?;
+        let chunking_context = this.chunking_context.await?;
         let environment = this.chunking_context.environment();
 
         let output_root = this.chunking_context.output_root().await?;
@@ -137,9 +141,12 @@ impl EcmascriptDevEvaluateChunkVc {
             StringifyJs(&params),
         )?;
 
-        match this.chunking_context.await?.runtime_type() {
+        match chunking_context.runtime_type() {
             RuntimeType::Default => {
-                let runtime_code = turbopack_ecmascript_runtime::get_dev_runtime_code(environment);
+                let runtime_code = turbopack_ecmascript_runtime::get_dev_runtime_code(
+                    environment,
+                    OptionStringVc::cell(chunking_context.chunk_base_path().cloned()),
+                );
                 code.push_code(&*runtime_code.await?);
             }
             #[cfg(feature = "test")]
diff --git a/crates/turbopack-ecmascript-plugins/src/transform/directives/client.rs b/crates/turbopack-ecmascript-plugins/src/transform/directives/client.rs
index 17863f485f852b..a54e6916973767 100644
--- a/crates/turbopack-ecmascript-plugins/src/transform/directives/client.rs
+++ b/crates/turbopack-ecmascript-plugins/src/transform/directives/client.rs
@@ -12,10 +12,8 @@ pub struct ClientDirectiveTransformer {
 }
 
 impl ClientDirectiveTransformer {
-    pub fn new(transition_name: &StringVc) -> Self {
-        Self {
-            transition_name: *transition_name,
-        }
+    pub fn new(transition_name: StringVc) -> Self {
+        Self { transition_name }
     }
 }
 
diff --git a/crates/turbopack-ecmascript-plugins/src/transform/directives/server_to_client_proxy.rs b/crates/turbopack-ecmascript-plugins/src/transform/directives/server_to_client_proxy.rs
index b52c836e19b2a3..c3827f0d9ff2d3 100644
--- a/crates/turbopack-ecmascript-plugins/src/transform/directives/server_to_client_proxy.rs
+++ b/crates/turbopack-ecmascript-plugins/src/transform/directives/server_to_client_proxy.rs
@@ -2,7 +2,7 @@ use swc_core::{
     common::DUMMY_SP,
     ecma::{
         ast::{
-            Expr, ExprStmt, Ident, ImportDecl, ImportDefaultSpecifier, ImportSpecifier,
+            Expr, ExprStmt, Ident, ImportDecl, ImportSpecifier, ImportStarAsSpecifier,
             KeyValueProp, Lit, Module, ModuleDecl, ModuleItem, ObjectLit, Program, Prop, PropName,
             PropOrSpread, Stmt, Str,
         },
@@ -25,7 +25,8 @@ pub fn create_proxy_module(transition_name: &str, target_import: &str) -> Progra
                 span: DUMMY_SP,
             })),
             ModuleItem::ModuleDecl(ModuleDecl::Import(ImportDecl {
-                specifiers: vec![ImportSpecifier::Default(ImportDefaultSpecifier {
+                // TODO(alexkirsz) Is this correct?
+                specifiers: vec![ImportSpecifier::Namespace(ImportStarAsSpecifier {
                     local: ident.clone(),
                     span: DUMMY_SP,
                 })],
diff --git a/crates/turbopack-ecmascript-runtime/js/src/dev/runtime/base/globals.d.ts b/crates/turbopack-ecmascript-runtime/js/src/dev/runtime/base/globals.d.ts
index eae4e2323ee6c5..343d3ae0400082 100644
--- a/crates/turbopack-ecmascript-runtime/js/src/dev/runtime/base/globals.d.ts
+++ b/crates/turbopack-ecmascript-runtime/js/src/dev/runtime/base/globals.d.ts
@@ -19,6 +19,7 @@ type ChunkUpdateProvider = {
   push: (registration: [ChunkPath, UpdateCallback]) => void;
 };
 
+declare var CHUNK_BASE_PATH: string;
 declare var TURBOPACK: ChunkRegistry | ChunkRegistration[] | undefined;
 declare var TURBOPACK_CHUNK_LISTS: ChunkListProvider | ChunkList[] | undefined;
 declare var TURBOPACK_CHUNK_UPDATE_LISTENERS:
diff --git a/crates/turbopack-ecmascript-runtime/js/src/dev/runtime/dom/runtime-backend-dom.ts b/crates/turbopack-ecmascript-runtime/js/src/dev/runtime/dom/runtime-backend-dom.ts
index b3eb55f583fcee..8b12437c8bb5fb 100644
--- a/crates/turbopack-ecmascript-runtime/js/src/dev/runtime/dom/runtime-backend-dom.ts
+++ b/crates/turbopack-ecmascript-runtime/js/src/dev/runtime/dom/runtime-backend-dom.ts
@@ -197,7 +197,7 @@ function commonJsRequireContext(
     if (chunkPath.endsWith(".css")) {
       const link = document.createElement("link");
       link.rel = "stylesheet";
-      link.href = `/${chunkPath}`;
+      link.href = `/${CHUNK_BASE_PATH}${chunkPath}`;
       link.onerror = () => {
         resolver.reject();
       };
@@ -209,7 +209,7 @@ function commonJsRequireContext(
       document.body.appendChild(link);
     } else if (chunkPath.endsWith(".js")) {
       const script = document.createElement("script");
-      script.src = `/${chunkPath}`;
+      script.src = `/${CHUNK_BASE_PATH}${chunkPath}`;
       // We'll only mark the chunk as loaded once the script has been executed,
       // which happens in `registerChunk`. Hence the absence of `resolve()` in
       // this branch.
diff --git a/crates/turbopack-ecmascript-runtime/src/dev_runtime.rs b/crates/turbopack-ecmascript-runtime/src/dev_runtime.rs
index a5aa64746c7963..376490c80e65de 100644
--- a/crates/turbopack-ecmascript-runtime/src/dev_runtime.rs
+++ b/crates/turbopack-ecmascript-runtime/src/dev_runtime.rs
@@ -2,18 +2,22 @@ use std::io::Write;
 
 use anyhow::Result;
 use indoc::writedoc;
+use turbo_tasks::primitives::OptionStringVc;
 use turbopack_core::{
     code_builder::{CodeBuilder, CodeVc},
     context::AssetContext,
     environment::{ChunkLoading, EnvironmentVc},
 };
-use turbopack_ecmascript::StaticEcmascriptCodeVc;
+use turbopack_ecmascript::{utils::StringifyJs, StaticEcmascriptCodeVc};
 
 use crate::{asset_context::get_runtime_asset_context, embed_file_path};
 
 /// Returns the code for the development ECMAScript runtime.
 #[turbo_tasks::function]
-pub async fn get_dev_runtime_code(environment: EnvironmentVc) -> Result<CodeVc> {
+pub async fn get_dev_runtime_code(
+    environment: EnvironmentVc,
+    chunk_base_path: OptionStringVc,
+) -> Result<CodeVc> {
     let asset_context = get_runtime_asset_context(environment);
 
     let shared_runtime_utils_code =
@@ -50,7 +54,14 @@ pub async fn get_dev_runtime_code(environment: EnvironmentVc) -> Result<CodeVc>
             if (!Array.isArray(globalThis.TURBOPACK)) {{
                 return;
             }}
-        "#
+
+            const CHUNK_BASE_PATH = {};
+        "#,
+        StringifyJs(if let Some(chunk_base_path) = &*chunk_base_path.await? {
+            chunk_base_path.as_str()
+        } else {
+            ""
+        })
     )?;
 
     code.push_code(&*shared_runtime_utils_code.await?);
diff --git a/crates/turbopack/src/transition/context_transition.rs b/crates/turbopack/src/transition/context_transition.rs
new file mode 100644
index 00000000000000..6cf33857f10889
--- /dev/null
+++ b/crates/turbopack/src/transition/context_transition.rs
@@ -0,0 +1,60 @@
+use anyhow::Result;
+use turbopack_core::compile_time_info::CompileTimeInfoVc;
+
+use crate::{
+    module_options::ModuleOptionsContextVc,
+    resolve_options_context::ResolveOptionsContextVc,
+    transition::{Transition, TransitionVc},
+};
+
+/// A transition that only affects the asset context.
+#[turbo_tasks::value(shared)]
+pub struct ContextTransition {
+    compile_time_info: CompileTimeInfoVc,
+    module_options_context: ModuleOptionsContextVc,
+    resolve_options_context: ResolveOptionsContextVc,
+}
+
+#[turbo_tasks::value_impl]
+impl ContextTransitionVc {
+    #[turbo_tasks::function]
+    pub async fn new(
+        compile_time_info: CompileTimeInfoVc,
+        module_options_context: ModuleOptionsContextVc,
+        resolve_options_context: ResolveOptionsContextVc,
+    ) -> Result<ContextTransitionVc> {
+        Ok(ContextTransition {
+            module_options_context,
+            resolve_options_context,
+            compile_time_info,
+        }
+        .cell())
+    }
+}
+
+#[turbo_tasks::value_impl]
+impl Transition for ContextTransition {
+    #[turbo_tasks::function]
+    fn process_compile_time_info(
+        &self,
+        _compile_time_info: CompileTimeInfoVc,
+    ) -> CompileTimeInfoVc {
+        self.compile_time_info
+    }
+
+    #[turbo_tasks::function]
+    fn process_module_options_context(
+        &self,
+        _context: ModuleOptionsContextVc,
+    ) -> ModuleOptionsContextVc {
+        self.module_options_context
+    }
+
+    #[turbo_tasks::function]
+    fn process_resolve_options_context(
+        &self,
+        _context: ResolveOptionsContextVc,
+    ) -> ResolveOptionsContextVc {
+        self.resolve_options_context
+    }
+}
diff --git a/crates/turbopack/src/transition/mod.rs b/crates/turbopack/src/transition/mod.rs
index 2483cf556cef12..4470240d1bb8c1 100644
--- a/crates/turbopack/src/transition/mod.rs
+++ b/crates/turbopack/src/transition/mod.rs
@@ -1,6 +1,9 @@
+pub(crate) mod context_transition;
+
 use std::collections::HashMap;
 
 use anyhow::Result;
+pub use context_transition::ContextTransitionVc;
 use turbo_tasks::Value;
 use turbopack_core::{
     asset::AssetVc, compile_time_info::CompileTimeInfoVc, reference_type::ReferenceType,