Replace SWC with Babel

[Schniz]

I don't really like it, but I have more confidence on this type of code. I guess it will be an open PR for now.

The SWC implementation is using parse and print, which is like transform. SWC always prints JS code AFAIK and will not keep TS code as-is, which is generally what I want. I do not like it because the behavior can change based on the tsconfig.json, for instance.

I used print because as I'm writing this code, SWC's spans are not aligned with the input. 😕 swc-project/swc#1366 — I guess I can somehow hack this (maybe accumulate the Program spans every time and subtract from that myself?) but I do not like this approach at all.

Using Babel I can leverage MagicString to remove only what I really really want, and nothing else. But I'm afraid that it will be slower.

[vercel]

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remastered – ./packages/docs-site

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remastered-example-1 – ./packages/example-app

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remastered-example-tailwindcss – ./packages/example-app-tailwindcss

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