Codegen config issue

[riteshshukla04]

Description

I am facing issue while using codegen . The build starts failing

1. When I remove outputDir from codegen config android build starts breaking. (which I think is optional)
2. If I turn the includesGeneratedCode to false cmake is no longer able to link the specs generated 'react_codegen_RNCodegenExampleSpec'

If I keep the outputDir and includesGeneratedCode I am getting the below error on iOS

Packages

• create-react-native-library
• react-native-builder-bob

Selected options

✔ What type of library do you want to develop? › Turbo module
✔ Which languages do you want to use? › C++ for Android & iOS

Link to repro

https://github.com/riteshshukla04/rn-codegen-repro

Environment

System:
OS: macOS 15.1
CPU: (8) arm64 Apple M2
Memory: 194.16 MB / 16.00 GB
Shell:
version: "5.9"
path: /bin/zsh
Binaries:
Node:
version: 22.7.0
path: ~/.nvm/versions/node/v22.7.0/bin/node
Yarn:
version: 3.6.1
path: ~/.nvm/versions/node/v22.7.0/bin/yarn
npm:
version: 10.8.2
path: ~/.nvm/versions/node/v22.7.0/bin/npm
Watchman: Not Found
Managers:
CocoaPods:
version: 1.15.2
path: /Users/riteshshukla2/.rvm/gems/ruby-2.7.5/bin/pod
SDKs:
iOS SDK:
Platforms:
- DriverKit 24.1
- iOS 18.1
- macOS 15.1
- tvOS 18.1
- visionOS 2.1
- watchOS 11.1
Android SDK: Not Found
IDEs:
Android Studio: 2024.1 AI-241.18034.62.2412.12266719
Xcode:
version: 16.1/16B40
path: /usr/bin/xcodebuild
Languages:
Java:
version: 17.0.12
path: /usr/bin/javac
Ruby:
version: 2.7.5
path: /Users/riteshshukla2/.rvm/rubies/ruby-2.7.5/bin/ruby
npmPackages:
"@react-native-community/cli": Not Found
react: Not Found
react-native: Not Found
react-native-macos: Not Found
npmGlobalPackages:
"react-native": Not Found
Android:
hermesEnabled: true
newArchEnabled: true
iOS:
hermesEnabled: true
newArchEnabled: true

[riteshshukla04]

Upon looking into deeper RCA . The culprit seems to be below line.

react-native-builder-bob/packages/react-native-builder-bob/src/utils/patchCodegenAndroidPackage.ts

Lines 22 to 23 in 50bfbb8

	let codegenAndroidPath: string | undefined =
	packageJson.codegenConfig.outputDir.android;

If we remove outputDir from package.json . packageJson.codegenConfig.outputDir becomes undefined and throws an error when trying to access the android key. Adding optional chaining would fix the issue .

It wont make a difference as error will be thrown the next line but atleast the error message will be debuggable

[riteshshukla04]

#716 . Please see if this can be merged