ES Module

Piscina supports ES modules (ESM) out of the box. This example demonstrates how to use Piscina with ES modules in both the main script and the worker file.

Javascript

index.mjs

import { Piscina } from "piscina";

const piscina = new Piscina({
  filename: new URL("./worker.mjs", import.meta.url).href,
});

(async () => {
  const result = await piscina.run({ a: 4, b: 6 });
  console.log(result);
})(); // Prints 10

Typescript

index.ts

import Piscina from "piscina";
import { resolve } from "path";
import { filename } from "./worker";

const piscina = new Piscina({
  filename: resolve(__dirname, "./workerWrapper.js"),
  workerData: { fullpath: filename },
});
(async () => {
  const result = await piscina.run({ a: 4, b: 6 });
  console.log(result);
})();

The worker file is a simple ES module that exports a default function:

Javascript

worker.mjs

export default ({ a, b }) => {
  return a + b;
};

Typescript

worker.ts

interface Input {
  a: number;
  b: number;
}

export default ({ a, b }: Input): number => {
  return a + b;
};

You can also check out this example on github.