Files
yt-dlp-webui/frontend/src/hooks/observable.ts

44 lines
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TypeScript

import { useEffect, useState } from 'react'
import { Observable } from 'rxjs'
/**
* Handles the subscription and unsubscription from an observable.
* Automatically disposes the subscription.
* @param source$ source observable
* @param nextHandler subscriber function
* @param errHandler error catching callback
*/
export function useSubscription<T>(
source$: Observable<T>,
nextHandler: (value: T) => void,
errHandler?: (err: any) => void,
) {
useEffect(() => {
if (source$) {
const sub = source$.subscribe({
next: nextHandler,
error: errHandler,
})
return () => sub.unsubscribe()
}
}, [source$])
}
/**
* Use an observable as state
* @param source$ source observable
* @param initialState the initial state prior to the emission
* @param errHandler error catching callback
* @returns value emitted to the observable
*/
export function useObservable<T>(
source$: Observable<T>,
initialState: T,
errHandler?: (err: any) => void,
): T {
const [value, setValue] = useState(initialState)
useSubscription(source$, setValue, errHandler)
return value
}