import { FetchedFeatures } from './features';

interface StorageItem {
    get(): string | null;
    set(value: string): void;
}
interface cacheEntry {
    expireAt: number;
    staleAt: number;
    features: FetchedFeatures;
}
export declare function parseAPIFeaturesResponse(featuresInput: any): FetchedFeatures | undefined;
export interface CacheResult {
    features: FetchedFeatures;
    stale: boolean;
}
export declare class FeatureCache {
    private storage;
    private readonly staleTimeMs;
    private readonly expireTimeMs;
    constructor({ storage, staleTimeMs, expireTimeMs, }: {
        storage: StorageItem;
        staleTimeMs: number;
        expireTimeMs: number;
    });
    set(key: string, { features, }: {
        features: FetchedFeatures;
    }): CacheData;
    get(key: string): CacheResult | undefined;
}
type CacheData = Record<string, cacheEntry>;
export declare function isObject(item: any): boolean;
export {};
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