{"id":"3ad1de5f-65ff-43e9-9c3e-63e8f88301cc","shortId":"PM5yqW","kind":"skill","title":"cometchat-angular-calls","tagline":"CometChat Calls SDK integration for Angular 12-15 apps. Wraps the @cometchat/calls-sdk-javascript SDK in Angular service + component patterns. Covers dual-SDK init via APP_INITIALIZER, the Angular UI Kit's / / ` inline, mounts `` at the root of `AppComponent`.\n\n**Read these other skills first:**\n- `cometchat-calls` — dispatcher (modes, hard rules, anti-patterns)\n- `cometchat-angular-core` — `UIKitSettingsBuilder`, `APP_INITIALIZER` init pattern, login order, `environment.ts` credentials\n- `cometchat-angular-patterns` — lazy loading, route guards, standalone-vs-NgModule integration\n\n**Ground truth:**\n- SDK source — `~/Downloads/calls-sdk/calls-sdk-javascript-5/package/`\n- Angular sample app — `~/Downloads/calls-sdk/calls-sdk-javascript-5/sample-apps/cometchat-calls-sample-app-angular/`\n- Existing skill — `cometchat-angular-features` (calls section will move into here)\n- Public docs — https://www.cometchat.com/docs/calls/javascript/overview (Angular wrapper docs are sparse — sample app is canonical)\n\n---\n\n## 1. Hard rules — Angular specialization\n\n### 1.0 Calls SDK login is its own step (v5+)\n\nAngular uses the same JS SDKs as React. The v5 Calls SDK has its own auth state, separate from the Chat SDK. After `CometChat.login(uid, AUTH_KEY)` succeeds, you MUST also call `await CometChatCalls.login(uid, AUTH_KEY)` — without it, the FIRST calls API call throws **\"auth token cannot be null\"**.\n\n```ts\n// auth.service.ts\nimport { Injectable } from \"@angular/core\";\nimport { CometChat } from \"@cometchat/chat-sdk-javascript\";\nimport { CometChatCalls } from \"@cometchat/calls-sdk-javascript\";\n\n@Injectable({ providedIn: \"root\" })\nexport class AuthService {\n async login(uid: string): Promise {\n await CometChat.login(uid, environment.cometchatAuthKey);\n // v5 Calls SDK requires a separate login. Don't skip.\n await CometChatCalls.login(uid, environment.cometchatAuthKey);\n // Production: await CometChatCalls.loginWithAuthToken(authTokenFromBackend);\n }\n}\n```\n\n**Surprises:**\n- The Chat SDK persists login via localStorage; the **Calls SDK does NOT** across page reloads in Angular (it stores its session in localStorage too, but state can drift). Always check `CometChatCalls.getLoggedInUser()` on app bootstrap and re-login if null.\n- Run the login inside an Angular zone — if you bypass `NgZone` and the login resolves from a Web Worker context (rare), change detection won't fire downstream. Default `await` in a service method is fine.\n\n### 1.1 Dual-SDK contract\n\nSame web shape, wrapped in services:\n\n```ts\n// call-init.service.ts\nimport { Injectable } from \"@angular/core\";\nimport { CometChat } from \"@cometchat/chat-sdk-javascript\";\nimport { CometChatCalls } from \"@cometchat/calls-sdk-javascript\";\nimport { environment } from \"../../environments/environment\";\n\n@Injectable({ providedIn: \"root\" })\nexport class CallInitService {\n private initialized = false;\n\n async init(): Promise {\n if (this.initialized) return;\n\n // Chat SDK — required for ringing\n const appSettings = new CometChat.AppSettingsBuilder()\n .subscribePresenceForAllUsers()\n .setRegion(environment.cometchat.region)\n .build();\n await CometChat.init(environment.cometchat.appId, appSettings);\n\n // Calls SDK — WebRTC session\n const callAppSettings = new CometChatCalls.CallAppSettingsBuilder()\n .setAppId(environment.cometchat.appId)\n .setRegion(environment.cometchat.region)\n .build();\n CometChatCalls.init(callAppSettings);\n\n this.initialized = true;\n }\n}\n```\n\nWired via `APP_INITIALIZER` in `app.module.ts`:\n\n```ts\n{\n provide: APP_INITIALIZER,\n useFactory: (svc: CallInitService) => () => svc.init(),\n deps: [CallInitService],\n multi: true,\n}\n```\n\n### 1.2 VoIP push — N/A on Angular web (same as React)\n\nSame as `cometchat-react-calls` rule 1.2 — browsers don't have VoIP push. Web Push (Service Worker + `Notification`) is opt-in fallback.\n\n### 1.3 Lifecycle — `getUserMedia` cleanup\n\nSame as web. Custom WebRTC surfaces must `getTracks().forEach(t => t.stop())` on hangup. The `` selector handles it for additive mode.\n\n### 1.4 Server-minted auth tokens\n\n`cometchat-angular-production` covers this. Production calls use `CometChat.login(authToken)`, not `CometChat.login(uid, authKey)`.\n\n### 1.5 Hangup cleanup — see rule 1.3 + zone consistency\n\nWhen a Calls SDK callback fires outside Angular's zone, the UI doesn't update. Standard fix:\n\n```ts\nimport { NgZone } from \"@angular/core\";\n\nexport class OngoingCallComponent {\n constructor(private zone: NgZone) {}\n\n ngOnInit() {\n CometChatCalls.joinSession(token, settings, container); // v5 canonical (startSession is a deprecated shim)\n\n // Wrap any UI-mutating callback in NgZone.run\n callListener.onCallEnded = () => {\n this.zone.run(() => {\n this.callEnded = true;\n this.cleanup();\n });\n };\n }\n\n cleanup() {\n CometChatCalls.leaveSession();\n this.stream?.getTracks().forEach(t => t.stop());\n }\n}\n```\n\nWithout `NgZone.run`, change detection doesn't fire and the UI looks frozen until the next user interaction.\n\n**⚠️ Where does the WebRTC `#callContainer` live? Two valid patterns; pick one explicitly.**\n\nThe container `
` must exist in the DOM when `CometChatCalls.joinSession(token, settings, container)` runs. Angular's `@if` (or `*ngIf`) gates this — get the gate wrong and the call surface never renders. Two patterns work; the second is recommended for new code:\n\n#### Pattern A — Single-component, gated by `@if (phase === 'ongoing')`\n\nThe container lives inside the same component that owns call state. Race: after `phase.set('ongoing')`, the next microtask runs BEFORE Angular's zone-driven render, so `@ViewChild` is still null. Use a **full task tick**, not a microtask:\n\n```ts\nthis.phase.set('ongoing');\n\n// ❌ WRONG — microtask runs before Angular renders the @if block\n// await Promise.resolve();\n\n// ✅ RIGHT — full task tick gives Angular's change detector time to mount the container\nawait new Promise((r) => setTimeout(r, 0));\n\nconst container = this.callContainer?.nativeElement;\nif (!container) throw new Error('Call container not ready.');\nawait CometChatCalls.joinSession(callToken, callSettings, container);\n```\n\nValidated 2026-05-13 against a Next.js peer.\n\n#### Pattern B — Separate `OngoingCallComponent`, parent-conditional mount (RECOMMENDED)\n\nThe container lives in its own component, and the **parent** decides whether to instantiate that component (not an inner `@if` inside the child template). This sidesteps the race entirely:\n\n```html\n\n\n\n@if (state.isInCall()) {\n \n}\n@if (state.isIncoming()) {\n \n}\n```\n\n```html\n\n
\n
\n \n
\n```\n\n```ts\n// ongoing-call.component.ts\n@Component({ /* ... */, changeDetection: ChangeDetectionStrategy.OnPush })\nexport class OngoingCallComponent implements AfterViewInit, OnDestroy {\n @ViewChild('callContainer', { static: true })\n private callContainer!: ElementRef;\n\n protected readonly state = inject(CallStateService);\n\n async ngAfterViewInit(): Promise {\n // No setTimeout(0) needed — the component is only instantiated when\n // the parent's @if (state.isInCall()) flips true. The @ViewChild is\n // guaranteed resolved by the time ngAfterViewInit fires.\n await this.state.startWebRtcSession(this.callContainer.nativeElement);\n }\n\n ngOnDestroy(): void {\n this.state.endWebRtcSessionOnly();\n }\n}\n```\n\n**Why Pattern B is race-free:** the component is only INSTANTIATED when `state.isInCall()` becomes true. `ngAfterViewInit` fires after the view tree is built, by which point `#callContainer` exists. No `setTimeout 0` workaround needed.\n\n**Anti-pattern caught 2026-05-14:** mounting `` unconditionally with `@if (state.isInCall())` INSIDE the child template. `{static: true}` becomes a lie — the element isn't in the DOM at view-init on first mount → `ngAfterViewInit` throws `TypeError: Cannot read properties of undefined (reading 'nativeElement')` → `provideAppInitializer` rejects → bootstrap \"completes with error\" but the app still renders with stale initial signals.\n\n### 1.6 Permissions — browser handles `getUserMedia`\n\nSame as web. Surface `NotAllowedError` and `NotFoundError` to a clear UI message. HTTPS required (or localhost).\n\n### 1.7 IncomingCall mounted at app root\n\n`` belongs in `AppComponent`'s template, ABOVE ``:\n\n```html\n\n\n\n```\n\nInside a feature-module template means the listener disappears on route change → calls only ring when that route is active. Same canonical bug as React.\n\nFor lazy-loaded features that include calls, the dispatcher in `cometchat-angular-patterns` shows the eager-load-only pattern for the calls module.\n\n**⚠️ Mixed-stack receiver inconsistency (validated 2026-05-15).** If your Angular app is the RECEIVER in a mixed-stack scenario (mobile kit-based caller → Angular custom UI receiver), confirm a **single active session per UID** before relying on `onIncomingCallReceived`. Symptom: server records the incoming call (visible in REST `GET /users/{uid}/calls`), but the listener never fires on the active Angular tab — typically because a stale session for the same UID elsewhere is eating the call-delivery routing. Workaround:\n\n```bash\n# Evict all sessions for the receiver UID before testing\ncurl -X DELETE 'https://.api-.cometchat.io/v3/users//auth_tokens' \\\n -H 'appId: ' \\\n -H 'apiKey: '\n```\n\nThen hard-refresh the Angular tab so a fresh login mints a clean token. The reverse direction (Angular caller → mobile receiver) works without this workaround. Tracked for v4.3 investigation; full context in `project_pixel_to_angular_ringing_inconsistency` memory entry.\n\n### 1.8 Signals required for cross-service state under OnPush\n\nValidated 2026-05-14 on Angular 21.2.0. Single biggest \"looks-correct-but-fails-silently\" bug in this stack.\n\n```ts\n// ❌ Plain property — captured at component construction. With OnPush, the\n// template re-reads the captured value only when an explicit re-render\n// happens. If the service sets it later, the template stays stuck on\n// the initial value forever.\n@Injectable({ providedIn: 'root' })\nexport class CallInitService {\n loggedInUid: string | null = null;\n async init() { /* ... */ this.loggedInUid = 'cometchat-uid-5'; }\n}\n\n// In a component with OnPush, this looks reactive but isn't:\nprotected readonly loggedInUid = this.callInit.loggedInUid;\n// Template: {{ loggedInUid ?? 'connecting…' }} → stuck on \"connecting…\" forever\n\n// ✅ Signal — reactive readers re-render on .set()\n@Injectable({ providedIn: 'root' })\nexport class CallInitService {\n readonly loggedInUid = signal(null);\n async init() { /* ... */ this.loggedInUid.set('cometchat-uid-5'); }\n}\n\n// In the component (still OnPush):\nprotected readonly loggedInUid = this.callInit.loggedInUid;\n// Template: {{ loggedInUid() ?? 'connecting…' }} → updates within the next microtask\n```\n\n**Rule:** ANY service state that the template observes MUST be a signal (or an observable consumed via the `async` pipe / `toSignal`). Plain properties don't trigger OnPush change detection from outside the component's input/event surface.\n\nCross-service state set during `provideAppInitializer` is the classic case — by the time the component is constructed, the service property may or may not be set, and even if it isn't yet, a later `.set()` would never reach the template under OnPush.\n\n### 1.9 `provideAppInitializer` failures are silent — surface them in the UI\n\nModern Angular bootstrap \"completes\" even when `provideAppInitializer` throws — the error logs to `console.error` and the app still mounts in a partial state. Visible symptom: UI renders but cross-service state is stuck at initial values.\n\nBest practice — make init errors visible:\n\n```ts\n@Injectable({ providedIn: 'root' })\nexport class CallInitService {\n readonly loggedInUid = signal(null);\n readonly initError = signal(null);\n readonly initStep = signal('not-started');\n\n async init(): Promise {\n try {\n this.initStep.set('chat-init');\n await CometChat.init(/* ... */);\n\n this.initStep.set('calls-init');\n await CometChatCalls.init(/* ... */);\n\n this.initStep.set('chat-login');\n await CometChat.login(/* ... */);\n\n this.initStep.set('calls-login');\n // ERR_ALREADY_LOGGED_IN is common on HMR — tolerate it\n try {\n await CometChatCalls.login(/* ... */);\n } catch (e: any) {\n const code = e?.code ?? e?.message ?? '';\n if (!/already/i.test(String(code))) throw e;\n console.warn('[CallInitService] calls.login non-fatal:', e);\n }\n\n this.loggedInUid.set(uid);\n this.initStep.set('ready');\n } catch (e: any) {\n const msg = e?.message ?? e?.code ?? JSON.stringify(e);\n console.error('[CallInitService] init failed at step', this.initStep(), e);\n this.initError.set(`Failed at \"${this.initStep()}\": ${msg}`);\n throw e; // re-throw so APP_INITIALIZER still logs the failure\n }\n }\n}\n```\n\nThen render `initError` in the root template:\n\n```html\n@if (initError(); as err) {\n
Init failed: {{ err }}
\n}\n```\n\nWithout this surface, a single bug deep in init causes the dev to spend 20+ minutes guessing where the failure is. Validated 2026-05-14 — the `initStep` instrumentation immediately revealed an `ngAfterViewInit` ViewChild bug that had previously looked like a \"stuck on connecting\" without any clue.\n\n### 1.10 `ERR_ALREADY_LOGGED_IN` on HMR is non-fatal\n\n`CometChatCalls.login` is intolerant of re-login during dev HMR cycles. Wrap in a tolerant catch that only re-throws non-\"already\" errors (see 1.9 code above). The chat-side session survives HMR, so the calls session can ride on it.\n\n---\n\n## 2. Setup\n\n### Install\n\n```bash\nnpm install @cometchat/chat-sdk-javascript @cometchat/calls-sdk-javascript\n# additive mode: @cometchat/chat-uikit-angular is already installed\n```\n\n### `app.module.ts` (NgModule path)\n\n```ts\nimport { NgModule, APP_INITIALIZER, CUSTOM_ELEMENTS_SCHEMA } from \"@angular/core\";\nimport { CometChatUIKitModule } from \"@cometchat/chat-uikit-angular\"; // additive mode\nimport { CallInitService } from \"./services/call-init.service\";\n\n@NgModule({\n imports: [\n CometChatUIKitModule, // additive mode only\n ],\n providers: [\n {\n provide: APP_INITIALIZER,\n useFactory: (svc: CallInitService) => () => svc.init(),\n deps: [CallInitService],\n multi: true,\n },\n ],\n schemas: [CUSTOM_ELEMENTS_SCHEMA], // required by UI Kit selectors\n})\nexport class AppModule {}\n```\n\n### Standalone components (Angular 14+)\n\n```ts\n// main.ts\nbootstrapApplication(AppComponent, {\n providers: [\n {\n provide: APP_INITIALIZER,\n useFactory: (svc: CallInitService) => () => svc.init(),\n deps: [CallInitService],\n multi: true,\n },\n ],\n});\n```\n\nThe standalone-component path skips `CometChatUIKitModule` — instead, individual standalone selectors are imported per-component.\n\n---\n\n## 3. Components catalog\n\n### Calls SDK primitives (used in standalone or custom components)\n\nSame shape as `cometchat-react-calls` Section 3 — `CometChatCalls.init`, `generateToken(sessionId)` (single arg in v5; auth is internal after login), `joinSession(token, settings, htmlElement)` (v5 canonical; `startSession` is a deprecated shim), `leaveSession()` (v5 canonical; `endSession()` is deprecated), `CallSettingsBuilder`, etc. The audit-verified API surface is documented in `cometchat-react-calls` and applies unchanged in Angular (same JS SDK).\n\n### UI Kit selectors (additive mode — `@cometchat/chat-uikit-angular`)\n\n| Selector | Purpose |\n|---|---|\n| `` | Voice + video buttons (typically inside ``) |\n| `` | Root-mounted listener |\n| `` | Auto-mounted on initiate |\n| `` | Active call view |\n| `` | Paginated history |\n\n`CUSTOM_ELEMENTS_SCHEMA` (or full module imports) must be in the consuming module — same rule as the chat selectors.\n\n---\n\n## 4. Standalone integration\n\nWhen `product === \"voice-video\"` and there is no existing UI Kit.\n\n**Split by calling mode — these are two different shapes:**\n\n### 4a. Standalone — Session mode (meeting-room UX, no ringing)\n\nCalls SDK ONLY. NO Chat SDK. Matches the upstream sample at `~/Downloads/calls-sdk/calls-sdk-javascript-5/sample-apps/cometchat-calls-sample-app-angular/`. The skill scaffolds:\n\n1. **`services/call-init.service.ts`** — `CometChatCalls.init({ appId, region, authKey })` ONLY. No `CometChat.init`. Exposed via `provideAppInitializer`. Pass `authKey` at init time so `CometChatCalls.login(uid)` needs no second arg.\n2. **`pages/join-session/join-session.component.ts`** — UID picker (dev mode) + \"Start meeting\" / \"Join meeting\" + the meeting-room container (`@if (inMeeting()) {
}`). Container CSS: `position: fixed; width: 100vw; height: 100vh`. `CometChatCalls.joinSession(token, {}, container.nativeElement)` with empty settings. See `references/call-session.md` for the full canonical pattern.\n3. **Routing** — `/meet/:sessionId` route registered with `data: { reuseRoute: false }`.\n4. **`environment.ts`** — credentials block.\n5. **HTTPS check** — warns if dev server is HTTP non-localhost.\n\n**Why no Chat SDK:** session mode never touches the Chat SDK call entity. Initializing both SDKs adds two failure modes (Chat init, Chat login race) for zero benefit. The upstream Angular sample confirms this — it never imports `@cometchat/chat-sdk-javascript`.\n\n### 4b. Standalone — Ringing mode (CallButtons + Incoming/Outgoing/Ongoing kit selectors)\n\nDual-SDK: Chat SDK signaling channel + Calls SDK media channel. The skill scaffolds:\n\n1. **`services/call-init.service.ts`** — Chat SDK + Calls SDK init (sequential), exposed via `APP_INITIALIZER`.\n2. **`components/call-button/call-button.component.ts`** — Voice + video buttons, `[user]` input, emits `(callInitiated)`.\n3. **`pages/ongoing-call/ongoing-call.component.ts`** — `(deactivate)` route guard cleans up if user navigates away mid-call. WebRTC view via direct `CometChatCalls.joinSession`. Rule 1.5 cleanup.\n4. **`pages/call-logs/call-logs.component.ts`** — `/calls` route, paginated via `CallLogRequestBuilder`.\n5. **`AppComponent` template** — `` (or a custom incoming-call equivalent in standalone mode) above ``.\n6. **Routing** — `/calls` and `/ongoing-call/:sessionId` routes registered in `app-routing.module.ts`.\n7. **`environment.ts`** — credentials block (rule from `cometchat-angular-core`).\n8. **Optional Web Push** — Service Worker registration via `@angular/service-worker` if user opts in.\n\n## 5. Additive integration\n\nWhen `cometchat-angular-core` integration already exists. The skill:\n\n1. Adds `@cometchat/calls-sdk-javascript`.\n2. Patches existing `init.service.ts` (or whatever the project named it) to add `CometChatCalls.init` after `CometChat.init`.\n3. Adds `` to `AppComponent` template (rule 1.7).\n4. Wires `` inside the existing message-header template if not already present (often auto-rendered by `` when `[user]` is set).\n5. Optionally adds a `/calls` route for ``.\n\n## 6. Anti-patterns\n\n1. **Initializing in a feature module's `ngOnInit`** instead of `APP_INITIALIZER` / `provideAppInitializer`. The chat SDK auth context isn't ready when the component tries to use it. APP_INITIALIZER blocks bootstrap until init succeeds.\n2. **Mounting `` inside a feature module's component.** Disappears on route change. Mount in AppComponent (rule 1.7).\n3. **Skipping `NgZone.run` for SDK callbacks.** UI doesn't update on call-end. Rule 1.5.\n4. **Skipping `CUSTOM_ELEMENTS_SCHEMA`.** Selectors render but Angular logs \"is not a known element\" errors and breaks zone-aware bindings.\n5. **Using `CometChatCalls.joinSession` without `await CometChatCalls.generateToken`** — same anti-pattern as React.\n6. **Lazy-loading the calls module.** Calls must be initialized at bootstrap; lazy-loading defers init past the point where calls might already be coming in. Eager-load anything that imports `CallInitService`.\n7. **Running over HTTP non-localhost.** `getUserMedia` denies; `ng serve` is HTTPS-capable via `--ssl`.\n8. **Plain properties on services consumed by OnPush components** (rule 1.8). Captured-at-construction state stays stuck on the initial value forever. Use signals.\n9. **Inner `@if (state.isInCall())` inside the ongoing-call component's own template** (rule 1.5 Pattern B anti-pattern). Makes `{static: true}` `@ViewChild('callContainer')` a lie — `ngAfterViewInit` reads `undefined.nativeElement`. Gate at the parent.\n10. **Letting `provideAppInitializer` failures bubble silently** (rule 1.9). App mounts in a half-initialized state; UI looks like it's \"stuck connecting.\" Always surface an `initError` signal in the UI.\n11. **Failing on `ERR_ALREADY_LOGGED_IN`** during HMR (rule 1.10). Common during dev; wrap `CometChatCalls.login` in a tolerant catch.\n\n## 7. Verification checklist\n\n**Static:**\n\n- [ ] `@cometchat/chat-sdk-javascript` and `@cometchat/calls-sdk-javascript` in `package.json`\n- [ ] `APP_INITIALIZER` / `provideAppInitializer` registered in `app.module.ts` or `app.config.ts`\n- [ ] `CallInitService.init` calls Chat SDK init then Calls SDK init (sequential)\n- [ ] `CallInitService.loggedInUid` is a `signal` (NOT a plain property) — rule 1.8\n- [ ] `CallInitService` exposes `initError: signal` and the root template renders it — rule 1.9\n- [ ] `CometChatCalls.login` wrapped in tolerant catch for `ERR_ALREADY_LOGGED_IN` — rule 1.10\n- [ ] `CUSTOM_ELEMENTS_SCHEMA` in the consuming module\n- [ ] `` in AppComponent template above `` (or split-component Pattern B per rule 1.5 — `@if (state.isInCall())` / `@if (state.isIncoming())` parent-conditional mount)\n- [ ] All SDK callbacks that mutate UI are wrapped in `NgZone.run`\n- [ ] Hangup path includes `CometChatCalls.leaveSession()` + track stops\n- [ ] `environment.ts` has `cometchat: { appId, region, authKey }` (dev) or token-endpoint config (prod)\n- [ ] Module-level `initialized` flag in CallInitService\n- [ ] Node version ≥ 20.19 or ≥ 22.12 (Angular CLI 21+ requirement)\n\n**Runtime (browser):**\n\n- [ ] Outgoing call connects, two-way audio + video\n- [ ] Incoming call rings on a separate route within the same app\n- [ ] Camera light off within 2 seconds of hangup\n- [ ] Route navigation during call cleanly disconnects (deactivate guard runs)\n- [ ] HTTPS or localhost only\n\n## 8. Pointers\n\n- `cometchat-angular-core` — UIKitSettingsBuilder, APP_INITIALIZER pattern, environment.ts\n- `cometchat-angular-components` — full UI Kit selector catalog (additive mode)\n- `cometchat-angular-patterns` — lazy loading, route guards, standalone-vs-NgModule\n- `cometchat-angular-production` — server-minted tokens, external-backend recipes (Express/Hono/Firebase/Vercel)\n- `cometchat-angular-troubleshooting` — CUSTOM_ELEMENTS_SCHEMA, zone issues, 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