exec-workers

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exec-workers

Install

npm i exec-workers

Usage

Create a worker.ts:

import { handleActions } from "exec-workers"

export const actions = {
  async sum(a: number, b: number) {
    await someHeavyOperation()
    return a + b
  },
}

export type Actions = typeof actions

handleActions(actions)

In your app.ts where you want to use the worker:

import { createWorker } from "exec-workers"
import { type Actions } from "./worker"

const worker = createWorker<Actions>(
  // Require a bundler like Vite, webpack etc
  () =>
    new Worker(new URL("./worker.ts", import.meta.url), {
      type: "module",
    }),
)

const result = await worker.run("sum", 1, 2)

expect(result).toBe(3)

To use the worker.ts in an iframe instead of a web worker, you only need to return the iframe element in createWorker instead:

const iframe = createWorker<Actions>(
  () => document.querySelector<HTMLIframeElement>("#your-iframe-element")!,
)

const result = await iframe.run("sum", 1, 2)

Error handling

Errors thrown in the worker will be re-thrown when you call the .run method:

worker.run("some-problematic-action").catch((err) => {
  // err is the error thrown in the worker
})