electron main 使用 ws 报错 ws does not work in the browser？

Question

main 进程代码：

import WebSocket from 'ws';

const ws = new WebSocket();
console.log({ ws });

错误：

ws does not work in the browser. Browser clients must use the native WebSocket object

看到相关issues
ws仓库

ws 模块的 package.json

  "exports": {
    ".": {
      "browser": "./browser.js",
      "import": "./wrapper.mjs",
      "require": "./index.js"
    },
    "./package.json": "./package.json"
  }

奇怪的是 electron main 进程为什么加载的是 browser, 而不是 import ?