Function listenToPageActivation

listenToPageActivation(fireImmediately, listener): RemoveListenerCallback
Listen to changes in page activation.
Parameters
- fireImmediately: boolean
  If true, the callback will immediately be fired with whatever the current value is.
- listener: ((isPageActive) => void | Promise<void>)
  This listener will be called any time the page activation changes.
  - - (isPageActive): void | Promise<void>
    - Parameters
      isPageActive: boolean
      Returns void | Promise<void>
Returns RemoveListenerCallback
A callback used to remove the listener.
- Defined in index.ts:10