import { StorageAdapter } from '../storage';
import { RawFlags } from './flags';

interface cacheEntry {
    expireAt: number;
    staleAt: number;
    flags: RawFlags;
    flagStateVersion?: number;
}
export declare function parseAPIFlagsResponse(flagsInput: any): RawFlags | undefined;
export interface CacheResult {
    flags: RawFlags;
    stale: boolean;
    flagStateVersion?: number;
}
export declare class FlagCache {
    private storage;
    private readonly storageKey;
    private readonly staleTimeMs;
    private readonly expireTimeMs;
    constructor({ storage, staleTimeMs, expireTimeMs, }: {
        storage: StorageAdapter;
        staleTimeMs: number;
        expireTimeMs: number;
    });
    set(key: string, { flags, flagStateVersion, }: {
        flags: RawFlags;
        flagStateVersion?: number;
    }): Promise<CacheData>;
    get(key: string): Promise<CacheResult | undefined>;
}
type CacheData = Record<string, cacheEntry>;
/**
 * Check if the given item is an object.
 *
 * @param item - The item to check.
 * @returns `true` if the item is an object, `false` otherwise.
 **/
export declare function isObject(item: any): item is Record<string, any>;
export {};
//# sourceMappingURL=flagCache.d.ts.map