import { type IReactionOptions } from 'mobx';
import { TransitionObserver as _TransitionObserver, type TransitionReaction } from '@zajno/common/observing/transition';
export declare const createReactionFactory: <T>(options?: IReactionOptions<T, false>) => TransitionReaction<T>;
export declare class TransitionObserver<T> extends _TransitionObserver<T> {
    constructor(getter?: () => T);
}
export declare function waitFor<T>(current: () => T, toBe: T): Promise<import("@zajno/common/types/misc.js").Nullable<T>>;