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How well supported is ES6 across browsers? Chrome for sure. Not sure about FF or IE.



The support is quite good today, see https://kangax.github.io/compat-table/es6/.


You can transpile to ES5 if you've got compatibility issues. Not really a problem.


Transpiling usually concerns syntax. Babel won't transpile .endsWith to a polyfill for you, hence the existence of that package




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