import { UniDuration } from '@ehmpathy/uni-time';
export interface SimpleInMemoryCache<T> {
    get: (key: string) => T | undefined;
    set: (key: string, value: T, options?: {
        expiration?: UniDuration | null;
    }) => void;
    keys: () => string[];
}
export interface SimpleInMemoryCacheState<T> {
    [index: string]: {
        value: T;
        expiresAtMse: number;
    };
}
export declare const createCache: <T>({ expiration: defaultExpiration, }?: {
    expiration?: UniDuration | null;
}) => SimpleInMemoryCache<T>;