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That #reactnative #Fabric & #TurboModules migration was a big pain, especially that I had Kotlin and Swift code to migrate, so it’s a big relief to have it done. And there is lots of completely undocumented stuff I wish I knew that would made it a lot easier to migrate 
If you care about backward compatibility, supporting #Fabric & #TurboModules is realistically doable only from version 0.70+ (Swift support + Kotlin fixes + CMake builds instead of NDK + autolinking for Android available only in rn cli v9 which is available in RN 0.70+)
Android side is easy:
- declare additional newarch nad oldarch sourcesets
- create seperate newarch/oldarch "entry" files for your module/viewmanager
- use existing module/viewmanager files as a "common" implementation
- declare additional newarch nad oldarch sourcesets
- create seperate newarch/oldarch "entry" files for your module/viewmanager
- use existing module/viewmanager files as a "common" implementation
The oldest piece of CPython, the parser generator (pgen) has been retired and replaced with a new version! 🐍🖥️🥳
The parser generator was the first piece written for Python 29 years ago. It generates the parser rules (in the form of DFAs) from the grammar specification file.
The parser generator was the first piece written for Python 29 years ago. It generates the parser rules (in the form of DFAs) from the grammar specification file.
The new pgen, based on lib2to3/pgen2 is completely written in Python and has much better error reporting: For example, if a grammar rule with multiple productions is not LL(1) it will indicate which terminal collides in the first sets of the productions.
This also simplifies the parser code (no more #ifdef preprocessor branches only for pgen stuff all over the place) and it deduplicates the token definitions!
