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"At Grab, we use ES2015 (with Babel Stage-0 preset) to enjoy the productivity boost from the syntactic improvements the future of JavaScript provides and we have been loving it so far."

You've not been using it that long then! Stay alive and stick with Stage-3

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Well, async/await and several other features were held up at stage1/2 for a long while. I found quite a few things very valuable far earlier on... async/await, object rest/spread, class (static) property syntax.

Now most of it is stage-3 or in-browser, so not a bad decision, but for a long time, you really wanted to be at stage-0/1 and deal with a bit of pain should things change.

Async/await was the pitfall for one project as they weren't just held up but they changed API during experimental implementations. Less concerning now you can write codemods to transform but if you don't own the code it's better to keep your client a little behind and safer.

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