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inspired by https://stanko.github.io/setting-up-webpack-babel-and-react-from-scratch/
(the part related to eslint was not applied)
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to run webpack :

    node ./node_modules/webpack/bin/webpack.js

        it will compile all the declared resources

to run in dev mode with hot reload :

    node ./node_modules/webpack-dev-server/bin/webpack-dev-server.js

    or

    webpack-dev-server

    or (with automatic refresh in the browser)

    npm run dev

to build a production ready application :

    node ./node_modules/webpack/bin/webpack.js

    npm run webpack