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Hey, thank you for taking your time to write this nice tutorial!

I've noticed few things tho:

First:
When you run
npm install --save-dev babel-cli
and then
babel code/index.js -d build/
it will fail if babel-cli is not installed globally (but it would run just fine as "script" from package.json)

Example should be:
./node_modules/.bin/babel code/index.js -d build/

On babeljs website (https://babeljs.io/docs/setup/#babel_cli) I found this very useful (as it prevents cases like this)

Note: Since it's generally a bad idea to run Babel globally you may want to uninstall the global copy by running npm uninstall --global babel-cli.

Second:
While this line is fine (if we disregard first problem)
babel --presets es2015,stage-0 code/index.js -o build/app.js
In .babelrs
"plugins" should be "presets"

Anyway, thanks again

Cheers