The code for the stack is almost the same as v5, with the only differences being the types and the navigation object. To avoid making same changes in 2 places which error-prone, I decided to reuse the same code. Due to the differences, it's not possible to just use it as a dependency, so I followed this approach:
- Copy the source files on post install and apply patches to make it work with React Navigation 4
- When we need to make changes, we can make them in v5 repo and update the version here, most of the time it wouldn't need any extra work
- If we need to make v4 specific changes, we can change the code in vendor/ and then re-generate the patch with `yarn patch`
