onmessage = (e) => {
  postMessage('pong')
}

import { promisify } from '@fiahfy/worker-promisify'

const worker = new Worker('worker.js')
const promiseWorker = promisify(worker)

promiseWorker.postMessage('ping').then((e) => {
  console.log(e.data) // pong
})

onmessage = ({ data: { key, data } }) => {
  postMessage({ key, data: Math.pow(data, 2) }) // must pass key and set return value to data
}

import { promisify } from '@fiahfy/worker-promisify'

const worker = new Worker('worker.js')
const promiseWorker = promisify(worker)

Promise.all([
  promiseWorker.parallelPostMessage('foo', 2), // must set unique keys
  promiseWorker.parallelPostMessage('bar', 3),
]).then(([e1, e2]) => {
  console.log(e1.data) // 4
  console.log(e2.data) // 9
})