/**
 * Deferred promise that must be resolved from outside
 */
export declare class Deferred<TDeferredValue> {
    #private;
    readonly promise: Promise<TDeferredValue | void>;
    get resolved(): boolean;
    get rejected(): boolean;
    get settled(): boolean;
    constructor();
    resolve(value?: TDeferredValue): void;
    reject(reason?: any): void;
}