Applies a filtering function to the observer and returns a new observer with filtered values.
A function that tests each value in the observer. Should return true or false.
Asynchronously maps the emitted values of the observer using the provided callback function.
The callback function that maps the emitted values of the observer.
Optional
fallbackfn: ((e: Error) => void)The optional fallback function that handles errors during mapping.
Merges the provided observer with the current observer instance. Returns a new observer that emits values from both observers.
The observer to merge with the current observer.
Executes the provided callback function only once. The callback function will be invoked when the specified event occurs for the first time.
The function to be executed only once.
Class representing a RouteManager.