/**
 * SHA-256 helpers used by the install command to verify manifest hashes.
 *
 * Pure node:crypto + node:fs streaming so the CLI stays zero-dep and uses
 * O(1) memory regardless of file size (spritesheets can be a few MB).
 */
import type { Readable } from "node:stream";
/**
 * Hex-encoded SHA-256 of a file on disk. Streams the file through a hash
 * so it can verify multi-MB sprite sheets without loading them into RAM.
 */
export declare function sha256OfFile(path: string): Promise<string>;
/**
 * Hex-encoded SHA-256 of a Readable stream. Consumes the stream to
 * completion. The caller is responsible for ensuring the stream is
 * actually readable (e.g. not already consumed).
 */
export declare function sha256OfStream(stream: Readable): Promise<string>;
/**
 * Hex-encoded SHA-256 of an in-memory Buffer. Convenience wrapper for
 * tests and small payloads (manifest JSON, fixture bytes).
 */
export declare function sha256OfBuffer(buf: Buffer): string;
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