diff --git a/src/renderer/src/worker/eval.ts b/src/renderer/src/worker/eval.ts
index a14bd0ed..abbf2635 100644
--- a/src/renderer/src/worker/eval.ts
+++ b/src/renderer/src/worker/eval.ts
@@ -1,8 +1,28 @@
-const workerUrl = new URL('evalWorker.js', import.meta.url);
+import invariant from 'tiny-invariant';
+
+// https://github.com/vitejs/vite/issues/11823#issuecomment-1407277242
+// https://github.com/mifi/lossless-cut/issues/2059
+import Worker from './evalWorker?worker';
+
+
+export interface RequestMessageData {
+  code: string,
+  id: number,
+  context: string // json
+}
+
+export type ResponseMessageData = { id: number } & ({
+  error: string,
+} | {
+  data: unknown,
+})
 
 // https://v3.vitejs.dev/guide/features.html#web-workers
 // todo terminate() and recreate in case of error?
-const worker = new Worker(workerUrl);
+const worker = new Worker();
+worker.addEventListener('error', (err) => {
+  console.error('evalWorker error', err);
+});
 
 let lastRequestId = 0;
 
@@ -22,13 +42,17 @@ export default async function safeishEval(code: string, context: Record<string,
       worker.removeEventListener('error', onError);
     }
 
-    function onMessage({ data: { id: responseId, error, data } }) {
+    function onMessage(response: { data: ResponseMessageData }) {
       // console.log('message', { responseId, error, data })
 
-      if (responseId === id) {
+      if (response.data.id === id) {
         cleanup();
-        if (error) reject(new Error(error));
-        else resolve(data);
+        if ('error' in response.data) {
+          reject(new Error(response.data.error));
+        } else {
+          invariant('data' in response.data);
+          resolve(response.data.data);
+        }
       }
     }
 
@@ -46,6 +70,6 @@ export default async function safeishEval(code: string, context: Record<string,
     worker.addEventListener('messageerror', onMessageerror);
     worker.addEventListener('error', onError);
 
-    worker.postMessage({ id, code, context: JSON.stringify(context) });
+    worker.postMessage({ id, code, context: JSON.stringify(context) } satisfies RequestMessageData);
   });
 }
diff --git a/src/renderer/src/worker/evalWorker.ts b/src/renderer/src/worker/evalWorker.ts
index b81669fc..b426ee9b 100644
--- a/src/renderer/src/worker/evalWorker.ts
+++ b/src/renderer/src/worker/evalWorker.ts
@@ -1,10 +1,15 @@
-// eslint-disable-next-line unicorn/no-this-assignment, @typescript-eslint/no-this-alias
-const myGlobal = this;
+import type { RequestMessageData, ResponseMessageData } from './eval';
+
 
 // https://stackoverflow.com/a/10796616/6519037
 // https://github.com/Zirak/SO-ChatBot/blob/master/source/eval.js
 // https://github.com/Zirak/SO-ChatBot/blob/master/source/codeWorker.js
 
+// `this` doesn't seem to work when transpiling, so use globalThis instead
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis
+const myGlobal = globalThis;
+
+
 const wl = {
   self: 1,
   onmessage: 1,
@@ -119,7 +124,7 @@ myGlobal.fetch = undefined;
 
 // eslint-disable-next-line wrap-iife, func-names
 (function () {
-  onmessage = (event) => {
+  onmessage = (event: MessageEvent<RequestMessageData>) => {
     // eslint-disable-next-line strict, lines-around-directive
     'use strict';
 
@@ -130,9 +135,9 @@ myGlobal.fetch = undefined;
       // https://stackoverflow.com/questions/8403108/calling-eval-in-particular-context
       // eslint-disable-next-line unicorn/new-for-builtins, no-new-func
       const result = Function(`\nwith (this) { return (${code}); }`).call(context);
-      postMessage({ id, data: result });
+      postMessage({ id, data: result } satisfies ResponseMessageData);
     } catch (e) {
-      postMessage({ id, error: `${e}` });
+      postMessage({ id, error: `${e}` } satisfies ResponseMessageData);
     }
   };
 })();
diff --git a/tsconfig.web.json b/tsconfig.web.json
index 56a2e8c4..3eb0d857 100644
--- a/tsconfig.web.json
+++ b/tsconfig.web.json
@@ -5,6 +5,8 @@
     "noEmit": true,
 
     "noImplicitAny": false, // todo
+
+    "types": ["vite/client"],
   },
   "references": [
     { "path": "./tsconfig.main.json" },