import type { PromiseExecutor } from "../types";
/**
 * LazyPromise, execute async operation when user await it.
 *
 * @author Theo Sun
 *
 * @category Async
 * @since 5.18.0
 */
export declare class LazyPromise<T = any> implements Promise<T> {
    private _executor;
    private _promise;
    /**
     * LazyPromise, execute async operation when user await it.
     *
     * @param executor Promise executor
     */
    constructor(executor: PromiseExecutor<T>);
    [Symbol.toStringTag]: string;
    private _getPromise;
    then<TResult1 = T, TResult2 = never>(onfulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2>;
    catch<TResult = never>(onrejected?: (reason: any) => TResult | PromiseLike<TResult>): Promise<T | TResult>;
    finally(onfinally?: () => void): Promise<T>;
}