1

tests/browser-nested-worker-node-shim.mjs

@@ -0,0 +1,19 @@
+import { parentPort, workerData } from "node:worker_threads";
+
+if (!parentPort) throw new Error("browser-nested-worker-node-shim requires a parent port.");
+if (!workerData?.moduleUrl) throw new Error("browser-nested-worker-node-shim requires moduleUrl.");
+
+globalThis.self = {
+  onmessage: null,
+  postMessage(message, transfer = []) {
+    parentPort.postMessage(message, transfer);
+  },
+};
+
+await import(workerData.moduleUrl);
+
+if (typeof globalThis.self.onmessage !== "function") {
+  throw new Error(`Nested browser worker module did not install onmessage: ${workerData.moduleUrl}`);
+}
+
+parentPort.on("message", (data) => globalThis.self.onmessage({ data }));