import { OnDestroy, PipeTransform } from '@angular/core';
import { Observable, Subscription } from 'rxjs';
import * as i0 from "@angular/core";
/**
 * A standalone pipe that unwraps the value of an observable or returns the value directly if it's not an observable.
 *
 * @description
 * The `UnwrapAsyncPipe` is used to unwrap the value emitted by an observable or return the value directly if it's not an observable.
 * It subscribes to the observable and returns the emitted value. If the input is not an observable, it simply returns the value.
 *
 * @usageNotes
 * ```html
 * <div>{{ observableOrValue | unwrapAsync }}</div>
 * ```
 *
 * @publicApi
 */
export declare class UnwrapAsyncPipe<T = any> implements PipeTransform, OnDestroy {
    #private;
    /**
     * The unwrapped value of the observable or the direct value.
     */
    value: T | null;
    /**
     * The subscription to the observable.
     */
    subscription: Subscription | null;
    /**
     * Performs cleanup tasks when the pipe is destroyed.
     */
    ngOnDestroy(): void;
    /**
     * Transforms the input value.
     *
     * @param value The input value to transform. It can be an observable or a direct value.
     * @returns The unwrapped value of the observable or the direct value.
     */
    transform(value: T | Observable<T>): T | null;
    /**
     * Unsubscribes from the current subscription.
     */
    private unsubscribe;
    static ɵfac: i0.ɵɵFactoryDeclaration<UnwrapAsyncPipe<any>, never>;
    static ɵpipe: i0.ɵɵPipeDeclaration<UnwrapAsyncPipe<any>, "unwrapAsync", true>;
}