import { CachedMessage, InAppMessage } from './types';
/**
 * Detect amount of local storage remaining (quota) and used (usage).
 * If usageDetails exist (not supported in Safari), use this instead of usage.
 */
export declare const determineRemainingStorageQuota: () => Promise<number>;
/**
 * Deletes cached messages not present in latest getMessages fetch.
 * @param cachedMessages
 * @param fetchedMessages
 */
export declare const getCachedMessagesToDelete: (cachedMessages: CachedMessage[], fetchedMessages: Partial<InAppMessage>[]) => string[];
/**
 * Adds messages to cache only if they fit within the quota, starting with
 * oldest messages since newer messages can still be easily retrieved via
 * new requests while passing in latestCachedMessageId param.
 * @param messages
 * @param quota
 */
export declare const addNewMessagesToCache: (messages: {
    messageId: string;
    message: InAppMessage;
}[]) => Promise<void>;