/**
 * Splice ZIP64 EOCD record + locator into fflate's final chunk and
 * patch the trailing EOCD entry-count fields with the 0xFFFF sentinel.
 *
 * `finalChunk` must be the [CD | EOCD] block fflate emits as its last
 * ondata callback (everything before it is per-entry LFH/data/DD that
 * we leave untouched). Returns a new chunk; the input is not mutated.
 *
 * Assumes per-entry sizes and central-directory offset fit in 32 bits;
 * throws if not (xlsx archives never approach those limits).
 */
export declare function applyZip64EntryCountPatch(finalChunk: Uint8Array, totalEntries: number): Uint8Array;