fabric/installer/client/gui/preload.js

const { contextBridge, ipcRenderer } = require("electron");

contextBridge.exposeInMainWorld("electronAPI", {
  invoke: (channel, ...args) => ipcRenderer.invoke(channel, ...args),
  send: (channel, ...args) => ipcRenderer.send(channel, ...args),
  on: (channel, func) => {
    ipcRenderer.on(channel, (event, ...args) => func(...args));
  },
});