ref(nextjs): Use loader to set RewriteFrames helper value
#5445
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lobsterkatie
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Lms24
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Jul 22, 2022
| type LoaderOptions = { | ||
| distDir: string; | ||
| }; | ||
| // TODO Use real webpack types |
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Is this gonna be done in a follow-up PR?
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Probably? Maybe? It's low priority, and slightly complicated by the need to be compatible with both webpack 4 and webpack 5. Not a blocker at the moment.
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…5479) In #5445, a change was made to the way the global `RewriteFrames` helper value is handled. Specifically, setting the default value (using the `||` operator) was moved to the place where the value is set rather than where it's retrieved. But if something goes wrong and for whatever reason the value never gets set globally, it now causes errors when the value is later used, because it has nothing to default to. This fixes that by restoring the default value to the old location, so that when it's used, it will never be undefined. Fixes #5478.
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ref: #5505 |
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Ref: #5505
In order to work, in the nextjs SDK our server-side
RewriteFramesintegration needs to know the name of the directory into which the app is built. While that information is readily available at build time, it isn't at runtime, so we adjust the webpack config to inject a global variable with the correct value in before the the injectedSentry.init()call fromsentry.server.config.jswherever we inject that `Sentry.init().Currently, this is done by creating a temporary file with the relevant code and adding it to the relevant pages'
entryvalue along withsentry.server.config.js. This works, but has its downsides, and is a fair amount of machinery just to add a single line of code.This injects the same line of code using a loader, which is really just a transformation function for the code from matching files. In this case, we're modifying
sentry.server.config.jsitself, so that by the time it's added to various pages' entry points, it already contains the relevant code. Since we don't know what the value will be ahead of time, there's a template, which the loader then populates before injecting the new code.But how is that any less machinery?, you might ask. All of that, still for just one line of code? Honestly, it's not. But in the quest to improve parameterization of transactions names, we're going to be adding a loader in any case. Adding the
RewriteFramesvalue thus provides the perfect proof of concept, precisely because it's so simple, letting us get the loader working separate from all of the other changes that work will entail.Notes:
distDirfrom retrieval-of-the-value time to storage-of-the-value time, because using a loader necessarily stringifies everything, meaningundefinedwas turning into the string'undefined', preventing the default from getting picked up.Fixes #4684