node-expat cannot be imported in worker threads

[achille-roussel]

Hello,

I encountered an issue trying to load node-expat in the context of a worker thread, see the minimal reproduction below:

{
  "name": "node-expat-bug",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "node-expat": "^2.3.18"
  }
}

const { Worker, isMainThread } = require('worker_threads')

if (isMainThread) {
  // Require in the top-level context works fine.
  require('node-expat')
  worker = new Worker(__filename)
} else {
  // Require in the context of a worker thread throws an exception:
  //
  //    Error: Module did not self-register: ...
  //
  require('node-expat')
}

This may be an example of how to fix it schroffl/node-lzo#11

Does this module aim to be usable in the context of a worker threads?