Just enabling new architecture for fabric component results in Undefined symbol: _RTNMyPdfDisplayCls

[BraveEvidence]

I created a new react native project. I have created fabric components for the new architecture previously as well but suddenly from yesterday I am facing issue saying Undefined symbol: _RTNMyPdfDisplayCls when I run yarn iOS. This issue is only for iOS. I have not written any objectivec code yet but just created the interface file in typescript but I have added the package.json file and pod spec file and ran the below commands

Also I have tried cleaning my iOS project multiple times, try deleting node_modules,yarn.lock, pods and pod file.lock as well

bundle install && RCT_NEW_ARCH_ENABLED=1 bundle exec pod install

yarn add ./RTNMyPdfDisplay

node myappiospdfurl/node_modules/react-native/scripts/generate-codegen-artifacts.js \
  --path myappiospdfurl/ \
  --outputPath myappiospdfurl/RTNMyPdfDisplay/generated/

RCT_NEW_ARCH_ENABLED=1 bundle exec pod install

Now when I run yarn iOS I get error

Full project over here

The app should at least run even though I have not written any objective c code but did the setup for my fabric component

Let me know what I am missing. Here is a proof of fabric components working for me previously
Check screenshot for below error message

[cipolleschi]

Hi @BraveEvidence, and thank you for your issue.
Your project can't work until you actually write some Objective-C.

When installing the pods, with RCT_NEW_ARCH_ENABLED=1 bundle exec pod install you are actually running Codegen. You can see it in the logs, where you should see something like this:

[Codegen] Adding script_phases to React-Codegen.
[Codegen] Generating ./build/generated/ios/React-Codegen.podspec.json
[Codegen] Processing react-native core libraries
[Codegen] Found react-native


[Codegen] >>>>> Searching for codegen-enabled libraries in /Users/cipolleschi/Official/react-native/packages/rn-tester/node_modules


[Codegen] >>>>> Searching for codegen-enabled libraries in react-native.config.js


[Codegen] >>>>> Searching for codegen-enabled libraries in the app
[Codegen] Found @react-native/tester


[Codegen] >>>>> Processing FBReactNativeSpec
[Codegen] Generated schema: /var/folders/7c/qm29xjcn3kd75by5ty28skpm0000gn/T/FBReactNativeSpecG4mNYG/schema.json
[Codegen] Generated artifacts: /Users/cipolleschi/Official/react-native/packages/rn-tester/build/generated/ios


[Codegen] >>>>> Processing rncore
[Codegen] Generated schema: /var/folders/7c/qm29xjcn3kd75by5ty28skpm0000gn/T/rncoreUzqNRJ/schema.json
[Codegen] Generated artifacts: /Users/cipolleschi/Official/react-native/packages/rn-tester/build/generated/ios


[Codegen] >>>>> Processing AppSpecs
[Codegen] Generated schema: /var/folders/7c/qm29xjcn3kd75by5ty28skpm0000gn/T/AppSpecsjmySXj/schema.json
[Codegen] Generated artifacts: /Users/cipolleschi/Official/react-native/packages/rn-tester/build/generated/ios


>>>>> Creating component provider
Generated schema list: /var/folders/7c/qm29xjcn3kd75by5ty28skpm0000gn/T/rn-tmp-schema-list.json
Generated provider in: /Users/cipolleschi/Official/react-native/React/Fabric

Among the various >>>>> Processing XXX, you should see your library, so a line with >>>>> Processing rtn-my-pdf-display.

Codegen actually generates some Objective-C and C++ code for you and it expect for you to fill in the blanks of what it requires, among which there is that method that needs to be implemented.
Specifically, you can see a file called RCTThirdPartyFabricComponentsProvider.h and RCTThirdPartyFabricComponentsProvider.mm in the React-Codegen Development pod that try to use that function.