import { OnChanges, SimpleChanges } from '@angular/core';
import { Observable, Subject } from 'rxjs';
import { SubscribeSink } from './subscribe-sink';
import * as i0 from "@angular/core";
/**
 * Extend this when creating a directive (including a component, which is a kind of directive) to gain access to the helpers demonstrated below.
 *
 * ```ts
 * @Component({
 *   selector: "app-color-text",
 *   template: `
 *     <span [style.background]="color">{{ color }}</span>
 *   `,
 *   changeDetection: ChangeDetectionStrategy.OnPush,
 * })
 *  class ColorTextComponent extends DirectiveSuperclass {
 *   @Input() color: string;
 *
 *   color$ = this.getInput$("color");
 * }
 * ```
 */
export declare abstract class DirectiveSuperclass extends SubscribeSink implements OnChanges {
    /**
     *  Emits the set of `@Input()` property names that change during each call to `ngOnChanges()`.
     */
    inputChanges$: Subject<Set<keyof this>>;
    private onChangesRan$$;
    onChangesRan$: Observable<boolean>;
    ngOnChanges(changes: SimpleChanges): void;
    /**
     * @return an observable of the values for one of this directive's `@Input()` properties
     */
    getInput$<K extends keyof this>(key: K): Observable<this[K]>;
    static ɵfac: i0.ɵɵFactoryDeclaration<DirectiveSuperclass, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<DirectiveSuperclass, "[ngsDirectiveSuperclass]", never, {}, {}, never, never, false, never>;
}