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Neil
4120501979
* perf(store): detect Zustand rerender churn the current audit cannot see The app-store-performance audit only understood inline selectors passed to a hook imported literally as `useAppStore`, so three shapes went unlinted: - a selector referenced by name (`useAppStore(selectRows)`), including one hoisted below its call site — resolved now via a Program:exit pass - the sibling store hooks (`usePluginPanelsStore` and friends), matched by the use<Name>Store convention on local imports; React's `useSyncExternalStore` matches that shape and is excluded - a fresh reference nested inside a `useShallow` projection, which is the worst case of the three: the comparator runs on every write and can never match, so the memo silently buys nothing `no-nested-fresh-under-shallow` covers the last one. `src` is clean against all four rules today, so this is a ratchet rather than a cleanup. The write side stays undecidable statically — whether a `set()` reallocated for nothing depends on the payload — so it gets a runtime probe instead. withStoreIdentityChurnProbe counts writes that replace a field's reference while its value stays equal, and can name the calling site. Cost when disarmed is one boolean load per write, matching react-commit-cascade-write-probe. * perf(store): scope the churn probe's scan to the write's own keys recordWrite iterated Object.keys of the full post-write state, so the armed cost scaled with the store's top-level field count (hundreds) rather than the size of the write. `set(partial)` merges, so no field outside the partial can have changed. The wrapper now resolves a functional updater itself and iterates the resolved partial's keys. Same function, same argument, called once — there is a test pinning that, since calling it twice would double any work a slice does inside its own updater. A replace write drops absent fields, so that path still scans every field. Disarmed cost is unchanged: one boolean load. * perf(store): follow a selector one hop into its helper Review feedback: both the lint rule and the manual sweep it was checked against only looked at the inline selector body, so neither could see a fresh allocation made inside a helper the selector calls — and delegating to a module-scope helper is the idiomatic shape here. Two methods sharing a blind spot is not corroboration. The two fresh-reference rules now resolve a single hop into a module-scope helper. The predicate used across that hop is deliberately stricter than the inline one: it requires EVERY returned expression to allocate unconditionally, so the common `cache.get(k) ?? buildFresh(state)` identity-caching shape is not flagged. An unresolvable helper is left alone rather than guessed at. Still zero hits across 20,330 files, so this stays a ratchet. * perf(store): keep the churn probe off the shipped write path Review hardening for the churn probe and the widened lint rules. Probe: it no longer resolves a functional updater itself. Zustand keeps sole ownership of when and with what argument an updater runs, so the middleware cannot double-invoke it or hand it a stale state. Object partials still scope the scan to the write's own keys; updater and replace writes fall back to the full field list, which costs one Object.is per untouched field and nothing more, since the deep compare only runs on replaced references. store/index.ts installs the probe only when import.meta.env.DEV or e2eConfig.exposeStore is set, the same gate as __store exposure. Nothing in the app arms it, so a shipped build was paying a wrapper frame per write for a diagnostic it could never read. The cascade probe stays unconditional because crash telemetry arms it in the field. Site capture now skips any *-probe.ts frame; under the real composition the first non-node_modules frame was the cascade probe's wrapper, so every churn was attributed to react-commit-cascade-write-probe.ts:32 instead of the caller. Plugin: named-selector recording is restricted to module scope. A component-local `const selectRows = ...` used to overwrite the entry for a same-named imported selector and flag an unrelated useAppStore(selectRows). The any-branch and every-branch allocation predicates are one function with a flag, the Object.* static list is a Set, and import recording is a single pass. Tests: updater called once with live state, identical-state writes ignored, disarmed path forwards exact arguments without calling get(), full composition with the cascade probe (no drop, no double, correct site), and the module-scope shadowing case for the plugin.