Upgrade React Native on your project, using a git-like interface

upgrade_rn.sh

# In the root directory of a project, the Git working copy must be clean:

echo "a" | react-native upgrade          # Generate the current version template and overwrite all files

git add .
git commit -m "Old version"              # The current version template is added to the index

npm i react-native@latest --save         # Install the new version of React Native

echo "a" | react-native upgrade          # Generate the new version template and overwrite all files

git add .
git commit -m "New version"              # Same as before, the new version template is added to the index

git diff HEAD~1 HEAD > upgrade.patch     # Output the diff, totally suitable for the user's project

git reset HEAD~2 --hard                  # Go back to the source before the 2 upgrade commits

git apply upgrade.patch --3way           # Git is able to perform a 3-way because the 3 versions of each files have an entry in the index