electron/lib/renderer/ipc-renderer-internal.ts

const binding = process.electronBinding('ipc');
const v8Util = process.electronBinding('v8_util');

// Created by init.js.
export const ipcRendererInternal: Electron.IpcRendererInternal = v8Util.getHiddenValue(global, 'ipc-internal');
const internal = true;

if (!ipcRendererInternal.send) {
  ipcRendererInternal.send = function (channel, ...args) {
    return binding.ipc.send(internal, channel, args);
  };

  ipcRendererInternal.sendSync = function (channel, ...args) {
    return binding.ipc.sendSync(internal, channel, args)[0];
  };

  ipcRendererInternal.sendTo = function (webContentsId, channel, ...args) {
    return binding.ipc.sendTo(internal, false, webContentsId, channel, args);
  };

  ipcRendererInternal.sendToAll = function (webContentsId, channel, ...args) {
    return binding.ipc.sendTo(internal, true, webContentsId, channel, args);
  };
}