import Observer from './observer.js';
import type { IObservable, MemoFunction, MemoOptions } from '../types.js';
import { Stack } from '../methods/debugger.js';
declare class Memo<T = unknown> extends Observer {
    fn: MemoFunction<T>;
    observable: IObservable<T>;
    sync?: boolean;
    constructor(fn: MemoFunction<T>, options?: MemoOptions<T>);
    run(stack?: Stack): void;
    stale(status: number, stack?: Stack): void;
}
export default Memo;