Test: trivial change to reproduce false positive bot issue#54815
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emily8rown wants to merge 1 commit intofacebook:mainfrom
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Test: trivial change to reproduce false positive bot issue#54815emily8rown wants to merge 1 commit intofacebook:mainfrom
emily8rown wants to merge 1 commit intofacebook:mainfrom
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This was referenced Dec 8, 2025
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…54819) Summary: Updates the `diff-js-api-breaking-changes` action to compare the PR's changes against the merge base (where the branch diverged from main) instead of the current tip of main. ### Problem The previous implementation compared the current state of `main` to the PR head. This could produce false positive results when main had new commits to reactNativeApi.d.ts reporting breaking changes from main as if they were introduced by the PR. ### Solution - Calculate the merge base between the PR head and `origin/main` - Compare the API snapshot at the merge base to the snapshot at the PR head ## Changelog: [GENERAL] [FIXED] - Updates the `diff-js-api-breaking-changes` action to compare the PR's changes against the merge base (where the branch diverged from main) instead of the current tip of main. Pull Request resolved: #54819 Test Plan: (outputs shown for #54815) Tested locally on branch that previously got false positive: Mirror old approach: ``` mkdir -p /tmp/api-diff-old git show origin/main:packages/react-native/ReactNativeApi.d.ts > /tmp/api-diff-old/before.d.ts git show HEAD:packages/react-native/ReactNativeApi.d.ts > /tmp/api-diff-old/after.d.ts node ./scripts/js-api/diff-api-snapshot /tmp/api-diff-old/before.d.ts /tmp/api-diff-old/after.d.ts ``` output: ``` { "result": "BREAKING", "changedApis": [ "ActivityIndicatorProps", "Animated", "DrawerLayoutAndroidProps", "FlatList", "FlatListProps", "ImageBackground", "ImageBackgroundProps", "ImageProps", "ImagePropsBase", "KeyDownEvent", "KeyEvent", "KeyUpEvent", "KeyboardAvoidingView", "KeyboardAvoidingViewProps", "ModalProps", "PressableProps", "ProgressBarAndroidProps", "RefreshControl", "RefreshControlProps", "ScrollViewProps", "SectionList", "SectionListProps", "SwitchProps", "TextInputProps", "ViewProps", "VirtualizedListProps", "VirtualizedSectionListProps" ] } ``` Mirror new approach: ``` git fetch origin main MERGE_BASE=$(git merge-base HEAD origin/main) echo "Merge base: $MERGE_BASE" mkdir -p /tmp/api-diff git show $MERGE_BASE:packages/react-native/ReactNativeApi.d.ts > /tmp/api-diff/before.d.ts git show HEAD:packages/react-native/ReactNativeApi.d.ts > /tmp/api-diff/after.d.ts node ./scripts/js-api/diff-api-snapshot /tmp/api-diff/before.d.ts /tmp/api-diff/after.d.ts ``` output: ``` { "result": "NON_BREAKING", "changedApis": [] } ``` Reviewed By: huntie Differential Revision: D88654826 Pulled By: emily8rown fbshipit-source-id: 5dc2e295d7d527899b5cb6a643c4878aeebf7f0b
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Not for merging
Summary:
Experiment to reproduce false positive breaking changes bot reactNativeApi.d.ts
Example commit 79b09ce added new api to reactNativeApi
so this branch checked out 630f80c (the commit just before)
Danger bot checks look like we have removed api despite not touching it
Changelog:
[GENERAL] [FIXED] - Message
Test Plan: