export declare const CACHE_BASE_PATH = "/tmp/airnode-cache";
/**
 * Lambda, when last tested circa November 2021, persists /tmp contents for 2.5 hours.
 */
export declare const CACHE_MAX_FILESYSTEM_AGE_MINUTES = 60;
/**
 * This is the maximum number of files allowed in the cache.
 * Lambda's /tmp mountpoint can handle approximately 130k files of minimum size (4KB).
 * 4 KB is a common sector size for modern filesystems and is used on Lambda's /tmp mountpoint.
 *
 * 512 MB (size of Lambda /tmp) * 1024 / 4 KB (minimum size) = ~130k files
 *
 * Some URLs detailing the 4 KB minimum file size:
 * ext4: https://askubuntu.com/questions/186813/why-does-every-directory-have-a-size-4096-bytes-4-k
 * tmpfs: https://www.linuxquestions.org/questions/linux-server-73/tmpfs-block-size-4175501796/
 * ntfs: https://support.microsoft.com/en-us/topic/default-cluster-size-for-ntfs-fat-and-exfat-9772e6f1-e31a-00d7-e18f-73169155af95#:~:text=By%20default%2C%20the%20maximum%20cluster,have%20a%20larger%20cluster%20size.
 */
export declare const CACHE_MAX_FILES = 20000;
export declare const isJest: () => boolean;
/**
 * Calls the OS syncs command to forcefully sync the cache filesystem.
 * This is the functional equivalent of "commit" from SQL.
 */
export declare const syncFsSync: () => void;
export declare const caching: {
    init: () => void;
    wipe: () => void;
    addKey: (key: string, data: any, force?: boolean) => void;
    removeKey: (key: string) => void;
    getValueForKey: (key: string) => any | undefined;
    getKeys: (prefix?: string) => string[];
    sweep: () => void;
    initPath: () => void;
    syncFsSync: () => void;
};
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