[POC] Structural sharing of Onyx cache#747

Draft

fabioh8010 wants to merge 13 commits into

Expensify:mainfrom

callstack-internal:feature/structural-sharing-cache

Commits on Mar 4, 2026

Phase 1: Centralize key utility functions into OnyxKeys module and add frozen collection snapshots for structural sharing
fabioh8010
committed
Phase 2: Eliminate redundant copies — per-key merge, reference equality fast path, return frozen snapshots by reference
fabioh8010
committed
Phase 3: Indexed subscriber lookup in keysChanged, reference equality for change detection, reference-stable fastMerge and removeNestedNullValues
fabioh8010
committed
Phase 4: Simplify useOnyx — replace shallowEqual with reference equality, fix memoized selector re-running when input changes but output doesn't
fabioh8010
committed
perf: lazy collection snapshot rebuilds — mark dirty on write, rebuild on next read
fabioh8010
committed

Commits on Mar 10, 2026

fix: return stable empty reference for empty collections to prevent extra re-renders
fabioh8010
committed

Commits on Mar 11, 2026

fix: preserve array reference stability in removeNestedNullValues
fabioh8010
committed

Commits on Mar 12, 2026

Commits on Mar 16, 2026

Commits on Mar 17, 2026

Merge branch 'main' into feature/structural-sharing-cache
fabioh8010
committed

Commits on Mar 19, 2026

Minor fixes
fabioh8010
committed