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 }));