dart_web_worker.dart

import 'dart:js_interop';
import 'package:web/web.dart';

void onMessage(Event event) {
  if (event is MessageEvent) {
    print('Worker received message: ${event.data}');
  }
}

void postMessage(
  WorkerGlobalScope self,
  JSAny? message, {
  JSObject? optionsOrTransfer,
}) {
  if (self is DedicatedWorkerGlobalScope) {
    if (optionsOrTransfer == null) {
      self.postMessage(message);
    } else {
      self.postMessage(message, optionsOrTransfer);
    }
  }
  print('Worker sent message: ${message}');
}

void main() {
  var self = globalContext as WorkerGlobalScope;
  // globalScope.importScripts("https://my/url.js");
  self.addEventListener('message', onMessage.toJS);
  print('Worker started');
  postMessage(self, 'Hello from worker'.toJS);
}