回答

Electron使用的chrome作为渲染，所有也是支持chrome的webrtc方法的，所以写法是一样的。

//获取electron和remote模块
const electron = require('electron');
const remote = electron.remote;
//获取屏幕视频源
let screenSources = remote.desktopCapturer.getSources({types: ['screen']});
//选择视频源并获取视频流
let screenStream = await navigator.mediaDevices.getUserMedia({
    audio: false,
    video: {
        mandatory: {
            chromeMediaSource: 'desktop',
            chromeMediaSourceId: screenSources[0].id
        }
    }
});
//创建RTCPeerConnection
let pc = new RTCPeerConnection();
//发布本地流
pc.addTrack(screenStream.getVideoTracks()[0], screenStream);
//处理ICE候选地址收集
pc.onicecandidate = (e) => {/.../};
//接收远程流
pc.onaddstream = (e) => {
    let remoteScreen = document.querySelector('#remote-screen');
    remoteScreen.srcObject = e.stream;
};
//创建RTCDataChannel并发送文件
let dc = pc.createDataChannel('fileChannel');
dc.onmessage = (e) => {/接收文件/};
dc.send(file);
//注册自定义协议
remote.app.setAsDefaultProtocolClient('electron-webrtc');
//创建菜单和托盘等UI
let menu = new Menu();
let tray = new Tray('/path/to/icon.png');
//打包应用
electron-packager . --platform=win32 --arch=x64  --electron-version=9.0.0