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I am working with Node.js 22 using native ESM and Worker Threads, I'm trying to share a single WebAssembly.Memory instance across multiple workers to avoid duplicating memory.

// main.mjs
import { Worker } from 'node:worker_threads';

const sharedMemory = new WebAssembly.Memory({ shared: true, initial: 10 });

new Worker(new URL('./worker.mjs', import.meta.url), {
  workerData: { memory: sharedMemory }
});
new Worker(new URL('./worker.mjs', import.meta.url), {
  workerData: { memory: sharedMemory }
});


// worker.mjs
import { workerData } from 'node:worker_threads';
import fs from 'node:fs';

const wasmBytes = fs.readFileSync('./module.wasm');
const { instance } = await WebAssembly.instantiate(wasmBytes, {
  env: { memory: workerData.memory }
});

console.log(instance.exports.doSomething());

Here Node.js is throwing a error

TypeError: WebAssembly.Memory(): shared memory cannot be cloned or transferred

Question: How can I safely share a single WebAssembly.Memory instance between multiple ESM worker threads in Node.js 22 is this currently unsupported or does it require a specific initialization pattern ?

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  • 1
    I'm getting a different error with Node.js v22.14.0 ("If shared is true, maximum property should be defined"), but after fixing that, it seems to work fine. Commented Oct 28 at 13:52
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