diff --git a/deno2/BUILD.gn b/deno2/BUILD.gn
index e660c08e902179..3792702717bac4 100644
--- a/deno2/BUILD.gn
+++ b/deno2/BUILD.gn
@@ -98,6 +98,7 @@ run_node("bundle") {
     "js/main.ts",
     "js/msg.pb.d.ts",
     "js/msg.pb.js",
+    "js/package.json", # `browserslist` field controls transform.
   ]
   outputs = [
     out_dir + "main.js",
diff --git a/deno2/js/package.json b/deno2/js/package.json
index eb6cfd7fdb0054..29d4d76ffa56b8 100644
--- a/deno2/js/package.json
+++ b/deno2/js/package.json
@@ -5,5 +5,8 @@
     "parcel-bundler": "^1.8.1",
     "protobufjs": "^6.8.6",
     "typescript": "^2.9.1"
-  }
+  },
+  "browserslist": [
+    "chrome 69"
+  ]
 }