ERROR: (gcloud.app.deploy) Error Response: [9]
Application startup error:

> react-typescript-by-sample@1.0.0 start /app
> webpack-dev-server  --mode development --inline --hot --open

sh: 1: webpack-dev-server: not found
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! react-typescript-by-sample@1.0.0 start: `webpack-dev-server  --mode development --inline --hot --open`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the react-typescript-by-sample@1.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2019-03-21T15_22_25_962Z-debug.log