make React Native autolinkable

[sibelius]

Describe the Feature

Right now we need to add a lot of pod specs to link react-native

check this https://github.com/facebook/react-native/blob/master/template/ios/Podfile#L42

pod 'FBLazyVector', :path => "../node_modules/react-native/Libraries/FBLazyVector"
  pod 'FBReactNativeSpec', :path => "../node_modules/react-native/Libraries/FBReactNativeSpec"
  pod 'RCTRequired', :path => "../node_modules/react-native/Libraries/RCTRequired"
  pod 'RCTTypeSafety', :path => "../node_modules/react-native/Libraries/TypeSafety"
  pod 'React', :path => '../node_modules/react-native/'
  pod 'React-Core', :path => '../node_modules/react-native/'
  pod 'React-CoreModules', :path => '../node_modules/react-native/React/CoreModules'
  pod 'React-Core/DevSupport', :path => '../node_modules/react-native/'
  pod 'React-RCTActionSheet', :path => '../node_modules/react-native/Libraries/ActionSheetIOS'
  pod 'React-RCTAnimation', :path => '../node_modules/react-native/Libraries/NativeAnimation'
  pod 'React-RCTBlob', :path => '../node_modules/react-native/Libraries/Blob'
  pod 'React-RCTImage', :path => '../node_modules/react-native/Libraries/Image'
  pod 'React-RCTLinking', :path => '../node_modules/react-native/Libraries/LinkingIOS'
  pod 'React-RCTNetwork', :path => '../node_modules/react-native/Libraries/Network'
  pod 'React-RCTSettings', :path => '../node_modules/react-native/Libraries/Settings'
  pod 'React-RCTText', :path => '../node_modules/react-native/Libraries/Text'
  pod 'React-RCTVibration', :path => '../node_modules/react-native/Libraries/Vibration'
  pod 'React-Core/RCTWebSocket', :path => '../node_modules/react-native/'

  pod 'React-cxxreact', :path => '../node_modules/react-native/ReactCommon/cxxreact'
  pod 'React-jsi', :path => '../node_modules/react-native/ReactCommon/jsi'
  pod 'React-jsiexecutor', :path => '../node_modules/react-native/ReactCommon/jsiexecutor'
  pod 'React-jsinspector', :path => '../node_modules/react-native/ReactCommon/jsinspector'
  pod 'ReactCommon/callinvoker', :path => "../node_modules/react-native/ReactCommon"
  pod 'ReactCommon/turbomodule/core', :path => "../node_modules/react-native/ReactCommon"
  pod 'Yoga', :path => '../node_modules/react-native/ReactCommon/yoga'

  pod 'DoubleConversion', :podspec => '../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec'
  pod 'glog', :podspec => '../node_modules/react-native/third-party-podspecs/glog.podspec'
  pod 'Folly', :podspec => '../node_modules/react-native/third-party-podspecs/Folly.podspec'

This makes it hard to newcomers and also hard to support monorepo with yarn hoist, as we need to change from

../node_modules/react-native

to

../../../node_modules/react-native

Possible Implementations

• provide a getNodeModulesPath('react-native') helper function for cocoapods

or

• autolink react-native - have a react-native.config.js that tells how to properly link react-native itself

[RichardLindhout]

I prefer the auto linking, since the react native libraries change a lot lately!

[vitalyiegorov]

• for autolinking

[grabbou]

Yes, this has been long on my plate as well. This is a great feature and I think we should ship it with the next.

I am going to write it down and see what's needed.

[thymikee]

This is already done on RN master. See: https://github.com/facebook/react-native/blob/d4d8887b5018782eeb3f26efa85125e6bbff73e4/template/ios/Podfile#L7 and facebook/react-native#28077 as a followup to make the name less confusing. No need to track it here, so closing.

[grabbou]

It's not and I actually question whether it's not going to cause even more issues.

See https://github.com/facebook/react-native/blob/d4d8887b5018782eeb3f26efa85125e6bbff73e4/scripts/autolink-ios.rb#L8, it assumes a path.

Hidden hardcoded path & optional use of ( and ) in Ruby = asking for troubles.

something doesn't work in a monorepo. How can I fix it?

[grabbou]

Fortunately, it's not shipping yet so we got time to improve it -> facebook/react-native@a35efb9#diff-1c007079c085ea0a9262971dc43e6cea

My suggestion: call use_react_native! from within use_native_modules - https://github.com/react-native-community/cli/blob/master/packages/platform-ios/native_modules.rb. We already know all the paths here and can easily point to correct React Native location, making it completely unnecessary to modify any path when working in a mono-repo or just moving files around.

Without this change, users will need to explicitly pass path to use_react_native! if different than ../node_modules/react-native (which can vary, depending on the setup in a monorepo and hoisting)

[grabbou]

CC: @alloy let me know what you think - this will be a breaking change as it's a non-backwards-compatible addition (requires change to Podfile after you upgrade to a newer React Native). We got time to ship it as a part of 0.63.

[alloy]

I actually would like to get rid of all the local path faffing. Users should retain control over what pieces of RN they actually need (i.e. it should be in their Podfile) and I’m afraid that adding more unique (to RN) abstractions is only going to make it harder for people to know how to control what they need.

[alloy]

Forgot to include some details; I’m thinking of a CocoaPods plugin that is able to treat node_modules as a spec-repo. This also fixes podspecs in node_modules having transitive dependencies on podspecs in other npm packages.

[grabbou]

Forgot to include some details; I’m thinking of a CocoaPods plugin that is able to treat node_modules as a spec-repo. This also fixes podspecs in node_modules having transitive dependencies on podspecs in other npm packages.

Sure, do you have any ETA or write-up on how you'd like to move on from this? This sounds interesting, but I am not familiar with how CocoaPods work and whether this would be easy to implement with our current behavior in mind. We probably don't want to introduce a lot of breaking changes and at the same time, realistically speaking, we haven't fully deprecated and removed legacy link code yet (a lot of work needed to do proper house keeping). Long story short, I'd like to help with this!

As much as I like the aforementioned improvement, I would treat it as a parallel track.

I was thinking to just move the use_react_native! from template to native_modules.rb and explicitly pass the path that we have already resolved and it's proven to work for past few releases.

Example (after line 34):

project_root = Pathname.new(config["project"]["ios"]["sourceDir"])

use_react_native(config["reactNativePath"])

Otherwise, it's going to ship with 0.63 and degrade monorepo support that we're working to improve.

[alloy]

I’m thinking of a CocoaPods plugin that is able to treat node_modules as a spec-repo.
Sure, do you have any ETA or write-up on how you'd like to move on from this?

Nothing yet. It’s probably a month or so out on my roadmap.

Long story short, I'd like to help with this!

Ace, I’ll definitely loop you in closer to that time 👌

As much as I like the aforementioned improvement, I would treat it as a parallel track.

Sure, good call 👍

I was thinking to just move the use_react_native! from template to native_modules.rb and explicitly pass the path that we have already resolved and it's proven to work for past few releases.

My concern still stands, though; moving the list of RN deps out of the user’s Podfile makes it hard to control what deps you really need. This is also why in the end I opted to not make make use of this abstraction in v0.62.

How would you solve that and does that solution outweigh leaving the noisy but explicit paths in the Podfile for a bit longer?

[grabbou]

My concern still stands, though; moving the list of RN deps out of the user’s Podfile makes it hard to control what deps you really need. This is also why in the end I opted to not make make use of this abstraction in v0.62.

I see. In this case, it's probably worth revisiting - my understanding was that this has been already decided and agreed to be the best way to go forward.

How would you solve that and does that solution outweigh leaving the noisy but explicit paths in the Podfile for a bit longer?

TBH, I don't have anything against RN dependencies being explicitly declared in a Podfile. Depending on whether the aforementioned abstraction ends up being included in 0.63 or not, we may or may not advocate for moving it under use_native_modules.

As far as the path itself, the use_native_modules can always return a config and we can use that value to replace the explicit path with the implicit one. In this case, the change is completely non-breaking and transparent.

[alloy]

As far as the path itself, the use_native_modules can always return a config and we can use that value to replace the explicit path with the implicit one. In this case, the change is completely non-breaking and transparent.

I like that 👍