import { Abon } from "./abon";
import { AbonSet } from "./abon-set";
import { ReadonlyAbon } from "./readonly-abon";
import { ChangeListener, UnsubscribeFn, ValueHandler } from "./types";
/** Inherits a value from children if the current value is undefined. */
export declare class ReadonlyAbonInheritedUp<T> implements ReadonlyAbon<T> {
    protected readonly children: AbonSet<Pick<ReadonlyAbon<T | undefined>, "subscribe" | "current">>;
    protected readonly value: Abon<T>;
    protected readonly childValue: ReadonlyAbon<T>;
    constructor();
    subscribe(listener: ChangeListener<T>): UnsubscribeFn;
    handle(handler: ValueHandler<T>): UnsubscribeFn;
    addChild<AT extends Pick<ReadonlyAbon<T | undefined>, "subscribe" | "current">>(abon: AT): AT;
    addChild(abon: Abon<T>): Abon<T>;
    addChild(): Abon<T | undefined>;
    removeChild(child: Pick<ReadonlyAbon<T | undefined>, "subscribe" | "current">): void;
    use(): this;
    useSubscription(listener: ChangeListener<T>, deps?: readonly any[]): void;
    useHandler(handler: ValueHandler<T>, deps?: readonly any[]): void;
    get current(): T;
}