export declare function delay(ms?: number): Promise<void>;
export declare class Deferred<T = void> {
    private _resolve;
    private _reject;
    promise: Promise<T>;
    constructor();
    resolve(value?: T): void;
    reject(err: Error): void;
}
export declare function debounce<T extends (...args: Parameters<T>) => ReturnType<T>>(callback: T, delay: number): (...args: Parameters<T>) => Promise<ReturnType<T>>;