import { Observable, Subject } from 'rxjs';
export interface GdkCacheContent {
    expiry: number;
    value: any;
}
export declare class GdkCacheService {
    private cache;
    readonly DEFAULT_MAX_AGE: number;
    get(key: string): Observable<any> | Subject<any>;
    set(key: string, value: any, maxAge?: number): void;
    has(key: string): boolean;
    private hasValidCachedValue;
}