import { type ErrorArgs, ExError } from './ExError.js';
export type RefCallback<T> = () => Promise<T>;
export declare class RefError extends ExError {
    constructor(code: string, message: string, args?: ErrorArgs);
}
export declare class LifeRef<T = unknown> {
    constructor();
    add(callback: RefCallback<T>): Promise<T>;
    minus(callback: RefCallback<T>): Promise<T | undefined>;
    waitFor(value: number): Promise<void>;
    get count(): number;
    private set count(value);
    private count_;
    private countSubject_;
    private startPromise_?;
    private stopPromise_?;
}
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