[@babel/babel-polyfill] allow use of Financial-Times/polyfill-library as polyfills-source about babel-polyfills HOT 7 OPEN

Just direct import of polyfills, I don't see any other way. I don't know anyone package which can provide required polyfills in the required format (ES or commonjs modules for each feature).

I'm thinking about adding polyfills for a serious part of web standards to core-js in the future since now we have tools like preset-env and runtime. However, if it will be done - it will be done not soon.

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Just interesting, how you are imagining it? polyfill-library does not support ES or commonjs modules, just files concatenation. It was a reason why some time ago core-js was not added to polyfill-service / polyfill-library as a polyfills source.

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polyfill-library has all the meta information for their polyfills. like detection for when to apply them and everything. just in a different format. I suggest the black magic @babel/babel-polyfill is using to detect that I used a Promise and @babel/preset-env is set to "IE >= 11", so it needs to polyfill Promise would work for stuff like ChildNode.remove or fetch. Retrieving the actual polyfill wouldn't be much different.

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polyfill-library has all the meta information for their polyfills. like detection for when to apply them and everything. just in a different format.

That's perfect and really useful. But @babel/preset-env with useBuiltIns: usage / entries just add imports of required polyfills as commonjs modules. It can't work with polyfill-library.

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So what's the supposed way to include custom polyfills? The main thing I'm after is the useBuiltIns:usage feature so I don't need to worry about polyfills and they get done from alone. How to accomplish this with other polyfills. Can I provide more polyfills in the format core-js is using and make @babel/preset-env use them? If yes - how?

The main goal is to keep my head free from thinking about "does this work?" "do i need to check if XMLHttpRequest exists?" - it would be nice to just write ES6 code with standards the majority (aka chrome) of browsers accept and having stuff that won't work on browsers in my browserlist transpiled to something that works from alone.

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Nah I mean like providing them in the correct format. I would like to provide the polyfills I need in the correct format myself so babel will pick them up.

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