Reactjs environment setup

See more:

ReactJS

> reactapp@1.0.0 start C:\Users\jmwan\Desktop\reactApp
> webpack-dev-server --hot

The CLI moved into a separate package: webpack-cli.
Please install 'webpack-cli' in addition to webpack itself to use the CLI.
-> When using npm: npm install webpack-cli -D
-> When using yarn: yarn add webpack-cli -D
module.js:549
throw err;
^

Error: Cannot find module 'webpack-cli/bin/config-yargs'
at Function.Module._resolveFilename (module.js:547:15)
at Function.Module._load (module.js:474:25)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (C:\Users\jmwan\AppData\Roaming\npm\node_modules\webpack-dev-server\bin\webpack-dev-server.js:65:1)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! reactapp@1.0.0 start: `webpack-dev-server --hot`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the reactapp@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! C:\Users\jmwan\AppData\Roaming\npm-cache\_logs\2018-07-28T10_32_03_431Z-debug.log

What I have tried:

redoing the entire process about twice