要运行构建步骤，您可以使用 npm脚本来完成，如下所示:

To run your build step, you can do it with npm scripts like this:

"scripts": {
  "start": "node server.js",
  "test": "mocha",
  "postinstall": "node node_modules/gulp/bin/gulp build"
}

然后您的 Procfile 可以很简单-

web: npm start

就错误而言，很难说，因为我没有完整的错误要​​看.确保您的 server.js 文件在正确的位置，并且您有一个 package.json 文件，其中列出了所有依赖项.

As far as the error goes, it's hard to say because I don't have the full error to look at. Make sure your server.js file is in the right spot, and you have a package.json file that lists all of your dependencies.