Function phaseFn

packages/core/src/render3/reactivity/after_render_effect.ts:109–156

(this: AfterRenderPhaseEffectNode, previousValue?: unknown)

    this.sequence.scheduler.notify(NotificationSource.RenderHook);
  },
  phaseFn(this: AfterRenderPhaseEffectNode, previousValue?: unknown): unknown {
    this.sequence.lastPhase = this.phase;

    if (!this.dirty) {
      return this.signal;
    }

    this.dirty = false;
    if (this.value !== NOT_SET && !consumerPollProducersForChange(this)) {
      // None of our producers report a change since the last time they were read, so no
      // recomputation of our value is necessary.
      return this.signal;
    }

    // Run any needed cleanup functions.
    try {
      for (const cleanupFn of this.cleanup ?? EMPTY_CLEANUP_SET) {
        cleanupFn();
      }
    } finally {
      // Even if a cleanup function errors, ensure it's cleared.
      this.cleanup?.clear();
    }

    // Prepare to call the user's effect callback. If there was a previous phase, then it gave us
    // its value as a `Signal`, otherwise `previousValue` will be `undefined`.
    const args: unknown[] = [];
    if (previousValue !== undefined) {
      args.push(previousValue);
    }
    args.push(this.registerCleanupFn);

    // Call the user's callback in our reactive context.
    const prevConsumer = consumerBeforeComputation(this);
    let newValue;
    try {
      newValue = this.userFn.apply(null, args as any);
    } finally {
      consumerAfterComputation(this, prevConsumer);
    }

    if (this.value === NOT_SET || !this.equal(this.value, newValue)) {
      this.value = newValue;
      this.version++;
    }

    return this.signal;
  },
}))();

/**