Fix base path for wasm splitting (#4770)

packages/cli/src/build/request.rs

@@ -3968,7 +3968,8 @@ impl BuildRequest {
                 let path = bindgen_outdir.join(format!("chunk_{}_{}.wasm", idx, chunk.module_name));
                 wasm_opt::write_wasm(&chunk.bytes, &path, &wasm_opt_options).await?;
                 writeln!(
-                    glue, "export const __wasm_split_load_chunk_{idx} = makeLoad(\"/assets/{url}\", [], fusedImports);",
+                    glue, "export const __wasm_split_load_chunk_{idx} = makeLoad(\"/{base_path}/assets/{url}\", [], fusedImports);",
+                    base_path = self.base_path_or_default(),
                     url = assets
                         .register_asset(&path, AssetOptions::builder().into_asset_options())?.bundled_path(),
                 )?;
@@ -3992,9 +3993,10 @@ impl BuildRequest {
 
                 writeln!(
                     glue,
-                    "export const __wasm_split_load_{module}_{hash_id}_{comp_name} = makeLoad(\"/assets/{url}\", [{deps}], fusedImports);",
+                    "export const __wasm_split_load_{module}_{hash_id}_{comp_name} = makeLoad(\"/{base_path}/assets/{url}\", [{deps}], fusedImports);",
                     module = module.module_name,
 
+                    base_path = self.base_path_or_default(),
 
                     // Again, register this wasm with the asset system
                     url = assets