File watcher 'Babel" warning after javascript 6 turn on

I use webStorm for my meteor app developing, I changed javascript version under Languages & Frameworks > JavaScript to ECMAScript 6.
Now I get a green background label in the top of the screen saying:
"File watcher 'Babel' is available for this file. Description: 'Transpiles ECMAScript 6 code to ECMAScript 5' then gives 2 options [Add watcher Dismiss]

What should I do and why? and what will happens? 


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WebStorm just offers you a possibility to set up Babel as a file watcher for your ES6 files, to transpile ES6 to pure javascript once the code changes. See,


If you don't like using file watcher, just click Dismiss to not see this prompt anymore


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