export declare type CacheOptions = {
    keyPrefix?: string;
    defaultDuration?: number;
};
export declare abstract class Cache {
    static initialize(config: [new (...args: any[]) => Cache, CacheOptions]): Cache;
    protected readonly keyPrefix: string;
    protected readonly defaultDuration: number;
    constructor(config: CacheOptions);
    exists(key: string): Promise<boolean>;
    get<T>(key: string, defaultValue: T): Promise<T>;
    get<T extends string | number | object>(key: string): Promise<T | null>;
    getOrSet<T extends string | number | object>(key: string, orSet: () => T | Promise<T>, duration?: number): Promise<T>;
    set(key: string, value: any, duration?: number): Promise<boolean>;
    add(key: string, value: any, duration?: number): Promise<boolean>;
    delete(key: string): Promise<boolean>;
    deleteAll(): Promise<boolean>;
    protected buildKey(key: string): string;
    protected abstract getValue(key: string): Promise<string | null>;
    protected abstract setValue(key: string, value: string, duration: number): Promise<boolean>;
    protected abstract addValue(key: string, value: string, duration: number): Promise<boolean>;
    protected abstract deleteValue(key: string): Promise<boolean>;
    protected abstract deleteAllValues(): Promise<boolean>;
}