CocoaPods near-term followup #4028

There's a lot more that could be improved in this doc; at zulip#3307 (comment), we noted that we don't want to keep an up-to-date doc of everything in the /src directory; everything should be done inline.

On expo-application v2.1.0 (see 18c37ce), we were seeing this warning on initial runs of `yarn`: warning " > expo-application@2.1.0" has unmet peer dependency "@unimodules/core@~1.0.0". (Same as in 5b6014e: "No such warning if `yarn` stops after step 'Resolving packages' and prints 'Already up-to-date'; but if it has any actual work to do, it always shows this warning in step 'Linking dependencies'.) Version 2.1.0 of expo-application declares that it depends on a version of @unimodules/core (1.0.0) that was already several months out-of-date at the time expo-application was first created, and it seems unlikely that this was well-considered. I filed expo/expo#7728 for this, and it was promptly addressed by releasing version 2.1.1 of expo-application that had "*" for its version constraint on the @unimodules/core peer dependency. So, switch to that new version. Even when we do that, though, we get the following: warning " > expo-application@2.1.1" has unmet peer dependency "@unimodules/core@*". This goes away when we declare a version of @unimodules/core in our own dependencies, though. Greg did some digging and concluded that this is likely what we're supposed to do, actually, because it's declared as a "peer dependency": """ Here's the reference doc for it: https://docs.npmjs.com/files/package.json#peerdependencies but it's not very clear about what it actually *means* -- mostly it just describes a use-case. The closest I've found to clear docs on it may be this Yarn blog post: https://classic.yarnpkg.com/blog/2018/04/18/dependencies-done-right/ > The `peerDependencies` object guarantees that, for each entry, any > package that requires you will be requested to provide a copy of > the dependency listed here, ideally matching the version you > requested. It also guarantees that you’ll be able to access this > dependency through `require()`, and finally **it also guarantees > that the return of `require()` will be exactly the same version & > instance than the one your parent would obtain if they were to > `require()` it themselves**. [emphasis in original] And if you work through the consequences of that... it means in particular that the "parent" has to have that dependency and be able to `require()` it themselves. Which, if you're declaring your dependencies cleanly, means the parent should have it as a dependency in their own `package.json`. """ So, declare @unimodules/core in our own "dependencies", with the version specified by react-native-unimodules in its active version. This matching should be done each time we change versions of react-native-unimodules.

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CocoaPods near-term followup #4028

CocoaPods near-term followup #4028

Commits on Apr 10, 2020