/**
 * Calculate the calling signature for a given key:
 * ttl + stack + computeFn body
 *
 * Signature is used to invalidate the key in case of changes in the calling code.
 * Signature is computed on client and sent to the server.
 * Server compares the signature with the stored one and invalidates the key if they differ.
 */
import { TTL } from './ttl';
type SingatureParams = {
    fn: Function;
    stack: string;
    ttl?: TTL;
};
export declare function calcSignature({ ttl, stack, fn }: SingatureParams): string;
export declare function checkSignature(key: string, storedSigStr: string, currentSigStr: string): string | undefined;
export {};
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