结合 node (v11.15.0)、webpack 和 typescript 使用 worker_threads -> 找不到模块

Question

I'm writting a NodeJS application where I want to use worker_threads to get rid of a blocking I/O call _mfrc522.findCard() by a third party module ( mfrc522-rpi ) which delays the request handling of a WebApi in the same application.

When I try to reference the worker_threads module in my TypeScript file I get the following WebPack error message:

const { Worker } = require('worker_threads');

ERROR in ./core/command-processing/rfid-command-processor.ts
Module not found: Error: Can't resolve 'worker_threads' in '/home/pi/leabox/src/core/command-processing'
 @ ./core/command-processing/rfid-command-processor.ts 11:19-44
 @ ./core/leabox-controller.ts
 @ ./index.ts

But I'm able to execute the following command directly:

node -e "require('worker_threads'); console.log('success');

Output: success

• Node version: 11.15.0
• WebPack version: 4.41.2
• TypeScript version: 3.6.4

Answer 1

Activating experimental worker support for node.js via the command line before starting the application solved the issue for me:

export NODE_OPTIONS=--experimental-worker

Please check this thread for further information.