我有一个具有以下结构的项目：
root_folder
- package.json
- server
-- index.js
- signalmaster
-- server.js
我正在尝试部署应用程序并使用Procfile启动2个节点服务器：
web: node server/index.js
webrtc: node signalmaster/server.js
如果我运行，可以在本地不同的标签中启动2台服务器：
node server/index.js
node signalmaster/server.js
但是当我将它部署到Heroku时，我收到以下错误：
Starting process with command `node signalmaster/server.js`
2018-02-08T02:45:52.143212+00:00 heroku[web.1]: State changed from starting to up
2018-02-08T02:45:52.450671+00:00 heroku[webrtc.1]: State changed from starting to up
2018-02-08T02:45:53.864411+00:00 heroku[webrtc.1]: State changed from up to crashed
2018-02-08T02:45:53.850099+00:00 heroku[webrtc.1]: Process exited with status 1
2018-02-08T02:45:53.776642+00:00 app[webrtc.1]: module.js:540
2018-02-08T02:45:53.776677+00:00 app[webrtc.1]:
2018-02-08T02:45:53.776673+00:00 app[webrtc.1]: throw err;
2018-02-08T02:45:53.776676+00:00 app[webrtc.1]: ^
2018-02-08T02:45:53.776679+00:00 app[webrtc.1]: Error: Cannot find module '/app/signalmaster/server.js'
2018-02-08T02:45:53.776681+00:00 app[webrtc.1]: at Function.Module._resolveFilename (module.js:538:15)
2018-02-08T02:45:53.776683+00:00 app[webrtc.1]: at Function.Module._load (module.js:468:25)
2018-02-08T02:45:53.776685+00:00 app[webrtc.1]: at Function.Module.runMain (module.js:684:10)
2018-02-08T02:45:53.776686+00:00 app[webrtc.1]: at startup (bootstrap_node.js:187:16)
2018-02-08T02:45:53.776689+00:00 app[webrtc.1]: at bootstrap_node.js:608:3
我的启动脚本如下所示：
"build:production": "NODE_ENV=production webpack --config webpack.config.js",
"start": "node server/index.js",
"postinstall": "npm run build:production"