build prostredi s webpack a babelem

webpack buildi dev i produkci, viz package.json babel transpiluje do es5

pouziti:

npm run start 
- spusti dev server na portu 3000 co servri obsah adresare 'build'. Kouka to do adresare 'app' a bere js file odtamtad. S kazdym save reloadne server i aplikaci

npm run build
- zbuildi aplikaci, transpiluje do es5, minifikuje a ulozi jako bundle.js v adresari build

dev dependence:

"babel-core": primarni transpiler

"babel-loader": zarizuje import a export js files jako kompinenty a moduly

"babel-preset-env": pridava babelu support es6 funkci na zaklade toho a toho browseru

"webpack": 

"webpack-cli": cli

"webpack-dev-server": devovy web server, --watch-poll kvuli tomu ze jinak nehlidal importovany js 
[https://stackoverflow.com/questions/42584315/webpack-dev-server-doesnt-watch-recompile-files-if-they-import-named-exports]