react / react-native

Code

How react/react-native is laid out, and where to start for common changes.

There is no import map for this report yet.

Where to start reading

Repository root
Repository root
Likely public API
Likely public API
Likely start-up file
Likely start-up file
Suggested starting pointAI
Suggested starting pointAI

Find files for a task

AI

Add a new UI component

Export component through main react-private-interface.js if intended for public API

Add animation support to a component

Define animated properties compatible with NativeAnimatedHelper via NativeAnimatedValidation
Test animation performance against warnOnRepeatedSafeAreaInsetsChanges patterns to avoid redundant updates

Add a new event type or responder behavior

Define event type mapping in ReactNativeEventTypeMapping
Implement responder logic in ReactNativeResponder or ResponderTouchHistoryStore
Route dispatched events through dispatchNativeEvent entry point

Gate a feature with a feature flag

Add flag definition to base flags file
Access flag resolution through ReactNativeFeatureFlags main module

Change the public API

Trace runtime behavior

Add or update tests

Change build or automation

RepoPilot lists up to 500 files, so a file missing here may still exist.

Files marked “likely” are guessed from their names.
The file list is newer than the written guide, so descriptions and suggested changes may describe older code.

Code quality and hotspots

Largest source files

Branch points97 per file on average
Code issues1 error, 248 warnings
Largest file6,082 lines
Hotspot load2 high-risk files

Static checks on the 15 largest source files.

Tests, CI and tooling

CIGitHub Actions38 workflows
Tests1,437 test files0.37 test files per source file (file count, not coverage)
Dependency updatesNo config detected

Test folders: .github/workflow-scripts/__tests__ · packages/dev-middleware/src/__tests__ · packages/debugger-shell/__tests__

Hotspots

flow-typed/environment/node.js9 commits in 180 days · 152 branch points
packages/dev-middleware/src/inspector-proxy/Device.js8 commits in 180 days · 150 branch points
packages/react-native-codegen/src/parsers/parsers-commons.js6 commits in 180 days · 129 branch points
packages/react-native-codegen/src/generators/modules/GenerateModuleH.js6 commits in 180 days · 113 branch points
packages/react-native/src/private/featureflags/ReactNativeFeatureFlags.js79 commits in 180 days · 5 branch points
packages/react-native-codegen/src/generators/components/GeneratePropsH.js2 commits in 180 days · 78 branch points
packages/react-native/src/private/renderer/events/ReactNativeResponder.js2 commits in 180 days · 78 branch points
packages/react-native-codegen/src/parsers/flow/modules/__test_fixtures__/fixtures.js4 commits in 180 days · 11 branch points

Files that change often and branch heavily, highest first. Branch points count if, loop, case, catch, ternary, && and || in the file.