Forward all parameters of transform to the upstream transfoemer #354
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kmagiera
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May 8, 2024
Fixes #198 This is another approach at resolving the complexity of enabling development JSX transforms. As noted in #198 the old approach would sometimes produce an error that the development transform throws when other instance of dev JSX transform run, or when some of jsx-self or jsx-source transforms are run on the same file along with the jsx dev version. The problem in the repro provided in #198 was due to the use of quite popular react-native-svg-transformer which doesn't forward `plugins` attribute to the upstream transformer. I proposed a fix for this issue in that repo kristerkari/react-native-svg-transformer#354 however, it isn't practical to wait for a fix there and hence the PR implements another workaround that doesn't depend on the `plugins` attribute of the transformer. The new approach relies on additional flag that is turned on when non-dev version of the plugin is loaded. What we try to achieve is that only jsx-dev transform is listed as plugin, and other varians (non-dev, -self, and -source) versions are all turned off. Since we can't hijack the plugins list, the only option is to use require overwrites. Furthermore, we need to consider the case when someone has a proper setup where only dev transform is listed and others are not. If we were to only overwrite non-deb with dev version, that wouldn't suffice for this particular case. What we now do is: 1) disable -self and -source transforms entirely (read inline comment for details on why we can do it) 2) replace non-dev JSX transform with dev version, and also use a flag to mark when this replaced non-dev version is used 3) replace dev JSX transform with extra logic that checks for the flag that marks whether non-dev version is used. If it is used, we return an empty transform. Otherwise, we just return the dev transform as it means that non-dev isn't registered. As stated in the inline comment, this approach would break if someone has dev transform registered before non-dev. Apparently, I don't see a better way to move forward with this approach and I'd hope that the current solution would cover the majority of setups.
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This PR fixes an issue where
pluginsparameter is not forwarded properly to the original transformer when svg-transformer is configured.See https://github.com/facebook/react-native/blob/main/packages/react-native-babel-transformer/src/index.js#L184 for the full list of attributes of the object that upstream transformer takes. And specifically note that except from
src,filenameandoptions, alsopluginsis listed there.Before this PR the list or attributes was limited to explicitely listed
src,filename, andoptions, whilepluginswas missing. Since this transformer only usessrcandfilenamedirectly, we replace the remaining part rest spread and forward it to the upstream transformer. This solution also makes this implementation more future proof in case new parameters are added.