import { OnChanges } from '@angular/core';
import * as i0 from "@angular/core";
export declare abstract class Controller implements OnChanges {
    private readonly change$$;
    readonly change$: import("rxjs").Observable<void>;
    ngOnChanges(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<Controller, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<Controller, never, never, {}, {}, never>;
}
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