npm start报错

1.报错信息

20 error code ELIFECYCLE
21 error errno 1
22 error  start: `webpack-dev-server --config ./scripts/webpack.dev.config.js`
22 error Exit status 1
23 error Failed at the start script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

原因 ：端口被占用

解决方式：

查询占用端口的进程：

netstat -ano|findstr  [端口号]

 

关闭进程：

taskkill /f /t /im [进程号]

 

 重新执行

npm start

2.报错信息

 You gave us a visitor for the node type "DeclareOpaqueType"   but it's not a valid type

解决方式：

npm install --save-dev babel-types