Running redux-saga in a web worker

index.ts

import {theSaga} from "somewhere";

const ctx: Worker = self as any;
const workerIO: RunSagaOptions<Action, undefined> = {
  subscribe: cb => {
    const listener = (ev: MessageEvent) => cb(ev.data);
    ctx.addEventListener("message", listener);
    return () => ctx.removeEventListener("message", listener);
  },
  dispatch: action => ctx.postMessage(action),
};

runSaga(workerIO, theSaga);