export type MemoizedAsync<T extends AnyAsyncFunction> = T & {
    readonly promise: ReturnType<T> | undefined;
};
export interface MemoizeAsyncOptions {
    /** Allow call once only. Always returns a memoized result. */
    readonly once?: boolean | undefined;
}
export declare function memoizeAsync<T extends AnyAsyncFunction>(func: T, options?: MemoizeAsyncOptions, ...rest: Parameters<ReturnType<T>['then']>): MemoizedAsync<T>;