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Summary:
The upgrade script uses `git apply --3way`:
4906f8d28c/react-native-git-upgrade/cliEntry.js (L368-L369)
If you've already upgraded something that React Native upgraded, this will silently fail. For example if you have already upgraded Gradle to the version available in the new version of React Native, the 3-way patch will fail. In this case, the upgraded version is installed into `node_modules` but `package.json` is not updated. More context, discussion, and information is in https://github.com/facebook/react-native/issues/12112#issuecomment-292619346.
Until a more robust solution is implemented, this PR proposes to mitigate the effects of the problem by informing the user of the possible issue and instructing them of a workaround.
In an affected project, I ran `react-native-git-upgrade` after applying my patch.
As expected, I now receive the following output:
![image](https://user-images.githubusercontent.com/789577/38165770-6209ac68-34de-11e8-9d96-7c782e9ef7ce.png)
After running the suggested command, `git status` now shows me the two rejections:
![image](https://user-images.githubusercontent.com/789577/38165796-d10ca7c8-34de-11e8-9037-8427513e3a84.png)
And I can now [manually apply](https://stackoverflow.com/a/28569128/1445366) these changes.
[CLI] [ENHANCEMENT] [react-native-git-upgrade/cliEntry.js] - Provide instructions for upgrading React Native when 3-way merges don't apply
Closes https://github.com/facebook/react-native/pull/18636
Differential Revision: D7603073
Pulled By: hramos
fbshipit-source-id: 32d387e1ee67d8b182d248c585cd33ba94808357
React Native Git Upgrade
This tool makes upgrading your apps to a new version of React Native easier than the stock react-native upgrade
command.
It uses Git under the hood to automatically resolve merge conflicts in project templates (native iOS and Android files, .flowconfig
etc.). These conflicts happen when a new React Native version introduces changes to those files and you have local changes in those files too, which is quite common.
Usage
See the Upgrading docs on the React Native website.
Basic usage:
$ npm install -g react-native-git-upgrade
$ cd MyReactNativeApp
$ react-native-git-upgrade