/**
 * A short, stable hash of a pad's content, for use inside a resource key.
 *
 * Pad content runs to 256 KiB and is arbitrary text; putting it in a key
 * verbatim would make the key unbounded and would carry the content into
 * whatever logs the store. The hash carries only the fact that decides the
 * question: is this still the same text the person was told about?
 */
export declare function contentFingerprint(text: string): string;