swc-project
API to collect Extra Data from Wasm plugins and custom transforms
Describe the feature
I think it is worth the effort. I'll work on this.
It will return the collect Extra Data emitted by custom plugins and Wasm plugins as an array or a hashmap, to the caller.
Additional context
No response
Would this make it possible to use an SWC plugin to extract metadata about a file? If so that would be incredibly useful.
To give one concrete example:
We're currently using @swc/plugin-formatjs as part of our internationalization system. The SWC plugin injects message ids and drops message descriptions during transpilation from TS -> JS. We end up having to re-process each TS file a second time to extract metadata about the messages in the file for translation. Unfortunately this uses @formatjs/ts-transformer under the hood which is significantly slower and potentially even inconsistent with @swc/plugin-formatjs.
I would love to be able to do this second pass using SWC + @swc/plugin-formatjs. Or even better to get rid of the second pass entirely and somehow output extracted metadata alongside the transpiled JS (maybe tangentially related to https://github.com/swc-project/swc/discussions/4997?)
Yeah it would be possible but actually this is already possible using file system
Do wasm plugins already have enough information/access to write a file that's a sibling to the transpilation output file? Ie something like foo.ts -> foo.js + foo.js.meta.json? I've poked around a little but haven't been able to find the output file location from the plugin. Sorry for getting a little off topic from the original issue 😬
Yes, cwd mount is still supported.
Ie something like foo.ts -> foo.js + foo.js.meta.json
Given swc transform can run parallel and does not have shared context in between each transform, there is no way to collect whole transforms meta.
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