worker-fn

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worker-fn hides the complexity of communication between the JavaScript main thread and Worker threads, making it easy to call the functions defined in workers.

worker-fn allows you to create proxy functions in the main thread that call corresponding worker functions defined in worker threads by sending messages. These proxy functions maintain the same function signatures as the corresponding worker functions (except that the return values of the proxy functions are wrapped in Promises).

Usage

Basic

math.worker.js:

import { defineWorkerFn } from "worker-fn";

function add(a, b) {
  return a + b;
}

function fib(n) {
  return n <= 2 ? 1 : fib(n - 1) + fib(n - 2);
}

defineWorkerFn("add", add);
defineWorkerFn("fib", fib);

math.js:

import { useWorkerFn } from "worker-fn";

const worker = new Worker(new URL("./math.worker.js", import.meta.url), {
  type: "module",
});

const add = useWorkerFn("add", worker);
const fib = useWorkerFn("fib", worker);

console.log(await add(1, 2)); // 3
console.log(await fib(5)); // 5

Using defineWorkerFns() and useWorkerFns()

Example

math.worker.js:

import { defineWorkerFns } from "worker-fn";

const fns = {
  add(a, b) {
    return a + b;
  },
  fib(n) {
    return n <= 2 ? 1 : fns.fib(n - 1) + fns.fib(n - 2);
  },
};

defineWorkerFns(fns);

math.js:

import { useWorkerFns } from "worker-fn";

const worker = new Worker(new URL("./math.worker.js", import.meta.url), {
  type: "module",
});

const { add, fib } = useWorkerFns(worker);

console.log(await add(1, 2)); // 3
console.log(await fib(5)); // 5

Using with TypeScript

Example

math.worker.ts:

import { defineWorkerFn } from "worker-fn";

function add(a: number, b: number) {
  return a + b;
}

function fib(n: number): number {
  return n <= 2 ? 1 : fib(n - 1) + fib(n - 2);
}

defineWorkerFn("add", add);
defineWorkerFn("fib", fib);

export type Add = typeof add;
export type Fib = typeof fib;

math.ts:

import { useWorkerFn } from "worker-fn";
import type { Add, Fib } from "./math.worker.ts";

const worker = new Worker(new URL("./math.worker.ts", import.meta.url), {
  type: "module",
});

const add = useWorkerFn<Add>("add", worker);
const fib = useWorkerFn<Fib>("fib", worker);

console.log(await add(1, 2)); // 3
console.log(await fib(5)); // 5

Using in Node.js with node:worker_threads

Example

math.worker.js:

import { parentPort } from "node:worker_threads";
import { defineWorkerFn } from "worker-fn";

function add(a, b) {
  return a + b;
}

function fib(n) {
  return n <= 2 ? 1 : fib(n - 1) + fib(n - 2);
}

defineWorkerFn("add", add, { port: parentPort });
defineWorkerFn("fib", fib, { port: parentPort });

math.js:

import { Worker } from "node:worker_threads";
import { useWorkerFn } from "worker-fn";

const worker = new Worker(new URL("./math.worker.js", import.meta.url));

const add = useWorkerFn("add", worker);
const fib = useWorkerFn("fib", worker);

console.log(await add(1, 2)); // 3
console.log(await fib(5)); // 5

Importing from JSR

worker-fn is published on both npm and JSR. If you want to import worker-fn from JSR, please refer to this document.

License

MIT License © 2024-PRESENT mys1024