fixes

js/workers.ts

@@ -1,9 +1,9 @@
 import * as dispatch from "./dispatch";
 import * as msg from "gen/msg_generated";
 import * as flatbuffers from "./flatbuffers";
-import { window } from "./globals";
 import { libdeno } from "./libdeno";
 import { assert, log, setLogDebug } from "./util";
+import { globalEval } from "./global_eval";
 
 export async function postMessage(data: Uint8Array): Promise<void> {
   const builder = flatbuffers.createBuilder();
@@ -56,14 +56,18 @@ export async function workerMain() {
   setLogDebug(true);
   log("workerMain");
 
+  // TODO avoid using globalEval to get Window. But circular imports if getting
+  // it from globals.ts
+  const window = globalEval("this");
+
   while (!isClosing) {
-    let data = await getMessage();
+    const data = await getMessage();
     if (data == null) {
       log("workerMain got null message. quitting.");
       break;
     }
     if (window["onmessage"]) {
-      let event = { data };
+      const event = { data };
       window.onmessage(event);
     } else {
       break;