/**
 * SHA256 helpers
 * Local hashing via Node crypto + remote hashing via shell with fallback
 */
/**
 * Compute sha256 of a local file (streaming, no full load to memory)
 */
export declare function sha256OfFile(localPath: string): Promise<string>;
/**
 * Compute sha256 for a list of files, reading no more than sixteen at once.
 * Results are returned in the same order as the input paths.
 *
 * The first unreadable file stops the work: the error propagates up, and
 * the remaining readers don't finish the tree the caller has already given
 * up on (for a download, they'd otherwise be reading the staging path right
 * before it gets deleted).
 */
export declare function sha256OfFiles(localPaths: string[]): Promise<string[]>;
/**
 * Compute sha256 of a Buffer
 */
export declare function sha256OfBuffer(buf: Buffer): string;