fix(nextjs): Move userNextConfig.sentry to closure
#5473
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…5516) In the process of working simultaneously on both #5472 (which adds the `sentry.transpileClientSDK` option to `next.config.js`) and #5473 (which moves the `sentry` options object from `next.config.js` to a new location halfway through the build process, in order to prevent nextjs from throwing warnings), I missed their overlap. As a result, the `transpileClientSDK` option is still currently being retrieved from the old, pre-move location, even though said retrieval happens in the second half of the build, after the move. (Unsurprisingly, it's therefore always undefined, rendering it useless). This fixes that by pulling it from the new, correct location instead. It also adjusts our types so that future mistakes like this will show up as errors, by creating separate pre-move and post-move `userNextConfig` types and using them as appropriate. Fixes #5452.
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h/t to @mitchheddles for the research and initial idea - thanks!
As of vercel/next.js#38498, nextjs now warns (voluminously) if the config exported from
next.config.jscontains properties it doesn't recognize, including thesentryproperty we've been having people use to do things like disable the webpack plugin. In order to prevent these warnings, the final config returned fromwithSentryConfigmust not have such a property, so this deletes the property from theuserNextConfigobject before returning it.If we were to stop there, the warning would be gone, but so would the data
userNextConfig.sentrycontains. (This is true even if we runconstructWebpackConfigFunctionbefore doing the deletion, because the place we need theuserNextConfig.sentrydata is not inconstructWebpackConfigFunctionitself but in the function it returns. By the time that function is called by nextjs, the deletion will already have gone through and the data will be gone unless we keep a reference to it elsewhere.) Therefore, in order to allow the returned function to retain access theuserNextConfig.sentrydata, this captures it before it's deleted and passes it toconstructWebpackConfigFunction, where it lives in a closure around the returned function.fixes #5449