preserving annotations / magic comments

[mayank99]

Describe the feature

Many tools rely on "magic comments", such as /*#__PURE__*/ and /*@vite-ignore*/. These comments are currently stripped out by SWC when using jsc.minify, unless you set jsc.minify.format.comments to "all" (which will preserve even non-meaningful comments).

It would be nice if SWC would preserve comments that start with # or @ when using comments: "some". It makes sense because SWC itself adds /*#__PURE__*/ comments.

As a bonus, it would be nice if this was also configurable, so that custom comments like /*webpackIgnore*/ can also be preserved.

Babel plugin or link to the feature description

No response

Additional context

Terser has a similar feature called preserve-annotations which is currently no-op in SWC. It might be good to support this properly in SWC.

[swc-bot]

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