diff --git a/filenames.auto.gni b/filenames.auto.gni
index e5c977ac9033..b40f23e11ad7 100644
--- a/filenames.auto.gni
+++ b/filenames.auto.gni
@@ -174,7 +174,7 @@ auto_filenames = {
   ]
 
   isolated_bundle_deps = [
-    "lib/isolated_renderer/init.js",
+    "lib/isolated_renderer/init.ts",
     "lib/renderer/web-view/web-view-constants.ts",
     "lib/renderer/web-view/web-view-element.ts",
     "package.json",
diff --git a/lib/isolated_renderer/init.js b/lib/isolated_renderer/init.ts
similarity index 100%
rename from lib/isolated_renderer/init.js
rename to lib/isolated_renderer/init.ts
diff --git a/typings/internal-ambient.d.ts b/typings/internal-ambient.d.ts
index 0550c2a24615..654cdb5271cf 100644
--- a/typings/internal-ambient.d.ts
+++ b/typings/internal-ambient.d.ts
@@ -1,4 +1,6 @@
 declare var internalBinding: any;
+declare var nodeProcess: any;
+declare var isolatedWorld: any;
 declare var binding: { get: (name: string) => any; process: NodeJS.Process; createPreloadScript: (src: string) => Function };
 
 declare const BUILDFLAG: (flag: boolean) => boolean;