electron/lib/renderer/api/ipc-renderer-setup.js

module.exports = function (ipcRenderer, binding) {
  ipcRenderer.send = function (...args) {
    return binding.send('ipc-message', args)
  }

  ipcRenderer.sendSync = function (...args) {
    return JSON.parse(binding.sendSync('ipc-message-sync', args))
  }

  ipcRenderer.sendToHost = function (...args) {
    return binding.send('ipc-message-host', args)
  }

  ipcRenderer.sendTo = function (webContentsId, channel, ...args) {
    if (typeof webContentsId !== 'number') {
      throw new TypeError('First argument has to be webContentsId')
    }

    ipcRenderer.send('ELECTRON_BROWSER_SEND_TO', false, webContentsId, channel, ...args)
  }

  ipcRenderer.sendToAll = function (webContentsId, channel, ...args) {
    if (typeof webContentsId !== 'number') {
      throw new TypeError('First argument has to be webContentsId')
    }

    ipcRenderer.send('ELECTRON_BROWSER_SEND_TO', true, webContentsId, channel, ...args)
  }
}