perf(client): one declaration site per CallState field, faster state reads - #2419
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…reads CallState declared every piece of state three times: the subject, a bare observable placeholder carrying the JSDoc, and an assignment in the constructor. Collapse that into one subject/observable pair per field and take the two performance wins that fall out of it. - add subject(), duc() and shared() helpers so each declaration is one line - initialize every observable as a field, leaving the constructor with only the event handler map (215 lines -> 98) - replace the 18 `undefined` entries in eventHandlers with an UnhandledEventType union in store/types.ts, enforced via `satisfies` - drop the combineLatest wrapper in RxUtils.getCurrentValue and read a BehaviorSubject's value directly - point the 27 getters backed by a plain subject at that subject Reading a scalar field is 20x faster, updateFromCallResponse 1.42x, a participant patch in a 10-person call 1.36x. Bundle is 2.9 kB smaller minified; heap per CallState grows ~250 bytes (~1%). BREAKING CHANGE: call.state.getCurrentValue() and call.state.setCurrentValue() are removed. Use RxUtils.getCurrentValue() and RxUtils.setCurrentValue(), both exported from @stream-io/video-client.
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📝 WalkthroughWalkthroughThe change refactors ChangesCallState reactive state refactor
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to Call state initialization is refactored to subject-backed fields and direct reads. The remaining risk is limited to nonconformance with the required mutable-state initialization convention, with no demonstrated behavior failure. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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jdimovska
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In `@packages/client/src/store/CallState.ts`:
- Around line 115-145: Update CallState so sortParticipantsBy and all subject
properties are declared as explicit class fields without inline initializers,
then assign their current default values in the constructor before eventHandlers
is initialized. Preserve the existing types, defaults, and initialization order.
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📒 Files selected for processing (6)
packages/client/src/devices/__tests__/ScreenShareManager.test.tspackages/client/src/store/CallState.tspackages/client/src/store/__tests__/CallState.test.tspackages/client/src/store/__tests__/rxUtils.test.tspackages/client/src/store/rxUtils.tspackages/client/src/store/types.ts
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…tState (#2422) ### 💡 Overview `StreamVideoReadOnlyStateStore` and `StreamVideoWriteableStateStore` were the last remnant of the original Writable/Readable split, deprecated years ago and never worked out. `StreamVideoClient` had to build both and keep a `protected writeableStateStore` next to a public `readonly readOnlyStateStore`, with `get state()` returning the read-only half, so internal code wrote through one field and read through another, while `Call` received the writeable one under the name `clientStore`. This replaces both with a single `ClientState` that is readable and writable, reachable as `client.state`, shaped exactly like `CallState`: private subjects, `x$` observables as field initializers, a getter per observable, and `@internal` setters. ### 📝 Implementation notes - `store/stateStore.ts` is deleted; `store/ClientState.ts` takes its place. Both class names are gone from the public surface of `@stream-io/video-client`, `-react-sdk` and `-react-native-sdk`, with no aliases left behind. - `client.readOnlyStateStore` and `get state()` are replaced by a public `readonly state: ClientState`. - `CallConstructor.clientStore` is renamed to `clientState` (and `Call`'s private field with it). - `subject`, `duc` and `shared` move out of `CallState.ts` into an internal `store/subjects.ts` so both state classes can share them. It is deliberately not added to `store/index.ts`, the same treatment as the existing `store/types.ts`. - **The auto-leave-on-disconnect effect moves out of the state class.** It used to be a live `connectedUserSubject.subscribe(...)` in the store's constructor; it is now `StreamVideoClient.leaveAllCalls`, called from `disconnectUser`. Two deliberate behavior changes, and the main thing to review here: the leaves are now **awaited**, so `disconnectUser()` resolves only once every call has left; and they run **before** `streamClient.disconnectUser(timeout)` rather than after. The ordering is what makes the awaiting safe: `Call.leave()` does real network work (`reject('cancel')`, `sfuStatsReporter.flush()`, `sfuClient.leaveAndClose()`), and awaiting that against an already-closed coordinator connection is how `disconnectUser` would start hanging in apps. Running the loop while the connection is still live is both faster and more correct. Coverage is unchanged: `setConnectedUser` has exactly two callers, both in `StreamVideoClient`. - Two logger scopes change, worth knowing since consumers can key `logOptions` by name: the call-registry trace moves from `client-state` to `ClientState`, and the leave-all lines now log under `client`. - `sample-apps/react/react-dogfood/hooks/useGleap.ts` needed a fix that was not obvious. It walked `Object.entries(client.state)` filtering on "has a `.subscribe`", which worked only because the old read-only store had nothing but the two observables. TypeScript `private` is erased at runtime, so the merged class exposes `connectedUserSubject` and `callsSubject` too; without a guard the Gleap payload would have duplicated every value and then hit a circular-reference `JSON.stringify` failure on raw `Call` objects, silently falling into the catch. Now filtered on `key.endsWith('$')`, which is what `serializeCallState` in the same file already does for `call.state`. - `sample-apps/react/egress-composite` drops its `@ts-expect-error private api` and calls `client.state.registerCall(call)` directly. > [!NOTE] > Stacked on #2419. Review that one first; the diff here is only the `ClientState` change. Base will retarget to `main` once #2419 merges. 🎫 Ticket: https://linear.app/stream/issue/REACT-1106/callstate-clientstate <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit - **New Features** - Added a unified client state API for accessing connected-user and call information. - Added support for registering, updating, unregistering, and finding calls through client state. - Client state observables now provide reactive updates for user and call changes. - **Bug Fixes** - Disconnecting now leaves active calls before closing the connection, while continuing even if leaving a call fails. - **Documentation** - Updated client architecture documentation to describe the unified state API. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
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💡 Overview
CallStatedeclared every piece of state three times: theBehaviorSubject, a barex$: Observable<T>placeholder carrying the JSDoc, and an assignment in the constructor. Understanding one field meant jumping between three regions ~200 lines apart, and adding one meant touching all three. This collapses it to one subject/observable pair per field, then takes the two performance wins that fall out of it.📝 Implementation notes
subject()is overloaded so the seeded and empty cases stay honest at the type level:subject<T>(initial)yieldsBehaviorSubject<T>,subject<T>()yieldsBehaviorSubject<T | undefined>.duc()andshared()replace the constructor-localdistinctUntilChangedclosure and the six hand-spelledshareReplay({ bufferSize: 1, refCount: true })calls.undefinedand those events would silently stop updating state.undefinedentries ineventHandlersexisted purely as a compile-time guard. They are replaced by anUnhandledEventTypeunion in the newsrc/store/types.ts, enforced withsatisfies CallStateEventHandlers. This keeps the "a newly introduced event fails to compile until it is triaged" guarantee and adds two more: a stale name in the ignore list, and an event that appears in both lists, now also fail to compile. All three are verified by perturbing the source, not assumed.RxUtils.getCurrentValueno longer wraps its argument incombineLatest. That wrapper landed in perf(client): share replay of computed observables #1095 to replacepipe(take(1)), whose problem was resolving with the first rather than the last synchronous value; a baresubscribealready has that property. It now also reads aBehaviorSubject's value directly instead of subscribing.asObservable()/duc()pair read their subject so they take that fast path. The eight backed by transforming pipelines (participants,rawParticipants,localParticipant,remoteParticipants,dominantSpeaker,pinnedParticipants,hasOngoingScreenShare,ownCapabilities) still read their observable, since those pipelines change the value.call.state.getCurrentValue()andcall.state.setCurrentValue()are removed in favour of callingRxUtilsdirectly, which is whatstateStore,DeviceManagerState,SpeakerStateandCall.tsalready do.📈 Benchmarks
Measured with the existing
bench/harness against this branch's merge base, median of 7, three full runs agreeing within ~2%.state.callingState)updateFromCallResponsestate.participantsupdateFromSfuCallState, fan-out, subscribe churnTwo caveats measured rather than waved away. Scalar writes look ~1.1x slower in the harness, but those totals are sub-millisecond and therefore display granularity; at 2M writes across 9 interleaved rounds the real delta is 14.31 -> 14.47 ns, i.e. flat. Heap per
CallStateinstance is genuinely ~250 bytes (~1%) larger; the harness reports +8%, but that number is cold-start attribution, and repeating it with the order swapped gives a stable ~0.9%.call.state.getCurrentValue()andcall.state.setCurrentValue()are removed. UseRxUtils.getCurrentValue()andRxUtils.setCurrentValue(), both already exported from@stream-io/video-client. Nothing in this repo outsideCallStateitself used them and no docs reference them.One further intentional behavior change:
RxUtils.getCurrentValueon a completedBehaviorSubjectnow returns its last value instead ofundefined, because it reads the held value rather than subscribing (RxJS does not replay to subscribers of a stopped subject). Nothing in the SDK completes aBehaviorSubject(the only.complete()in the monorepo isIceTrickleBuffer.live, a plainSubject), and there is a test pinning the new behavior. Every other shape was verified identical:ReplaySubjectat buffer size 1 and 2, finitewindowTime, completed and errored subjects, plainSubject,AsyncSubject,of(1,2,3),EMPTYandthrowError.✅ Verification
yarn lint:ci:all,yarn test:ci:client(82 files, 1168 passed, 1 skipped),yarn test:react-native:sdk(22 suites, 130 passed),yarn build:client.react-bindings,react-sdkandreact-native-sdkall typecheck against the rebuilt client. The generatedCallState.d.tsis unchanged apart from the two removed members, so all 35 observables keep their exact public types.🎫 Ticket: https://linear.app/stream/issue/REACT-1106/callstate-clientstate
Summary by CodeRabbit
Refactor
Tests