A lightweight framework for tracking and asserting against Jetpack Compose recompositions.
https://github.com/himattm/dejavu
Dejavu is a test-only library that turns recomposition behavior into assertions. Tag your composables with standard Modifier.testTag(), write expectations against recomposition counts, and get structured diagnostics when something changes — whether from a teammate, a library upgrade, an AI agent rewriting your UI code, or a refactor that silently destabilizes a lambda.
- Zero production code changes — just
Modifier.testTag() - One-line test setup —
createRecompositionTrackingRule() - Rich diagnostics — source location, recomposition timeline, parameter diffs, causality analysis
- Per-instance tracking — multiple instances of the same composable get independent counters