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Add note about the conflict with useBuiltins #2144

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tarjei
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@tarjei tarjei commented Dec 11, 2019

Hi, this is a stab at babel/babel#10121.

As I understand it, preset-env with useBuiltins set to usage conflicts with using the runtime helper, though it is not totally clear to me how.

Hi, this is a stab at #10121. 

As I understand it, preset-env with useBuiltins set to `usage` conflicts with using the runtime helper, though it is not totally clear to me how.
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netlify bot commented Dec 11, 2019

Deploy preview for babel ready!

Built with commit fb72449

https://deploy-preview-2144--babel.netlify.com

@nicolo-ribaudo
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The problem is only when using useBuiltIns and @babel/plugin-transform-runtime's corejs option, because it's not predictable which of the two polyfills would be applied to the different JavaScript features.

Using @babel/plugin-transform-runtime only for the helpers is safe.

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