import { CacheKey } from '../use-checkout.types';
export declare const cacheKeys: {
    readonly completed: "checkoutComplete";
    readonly id: "checkoutId";
    readonly url: "checkoutUrl";
};
export declare function getCacheBoolean(key: CacheKey, defaultValue: boolean): boolean;
export declare function getCacheString(key: CacheKey, defaultValue?: string): string;
export declare function setCacheItem(key: CacheKey, value: string): void;
export declare function unsetCacheItem(key: string): void;