/**
 * SHA256 hashing utilities for file content verification
 *
 * Used by Scampi's codebase caching feature to detect file changes.
 * When checking if files changed, we compare mtime first (fast),
 * then hash if needed for verification.
 */
/**
 * Compute SHA256 hash of a file using streaming for memory efficiency
 *
 * Uses Node.js streams to handle large files without loading
 * the entire file into memory.
 *
 * @param filePath - Absolute path to the file to hash
 * @returns Promise resolving to the hex-encoded SHA256 hash
 * @throws Error if the file cannot be read (e.g., not found, permission denied)
 *
 * @example
 * ```typescript
 * const hash = await hashFile('/path/to/file.ts');
 * console.log(hash); // '2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824'
 * ```
 */
export declare function hashFile(filePath: string): Promise<string>;
/**
 * Compute SHA256 hash of a string
 *
 * Convenience function for testing and hashing in-memory content.
 * For file content, prefer hashFile() for memory efficiency.
 *
 * @param content - The string content to hash
 * @returns The hex-encoded SHA256 hash
 *
 * @example
 * ```typescript
 * const hash = hashString('hello');
 * console.log(hash); // '2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824'
 * ```
 */
export declare function hashString(content: string): string;
/**
 * Compute SHA256 hash of a Buffer
 *
 * Convenience function for hashing binary data in memory.
 *
 * @param data - The buffer to hash
 * @returns The hex-encoded SHA256 hash
 *
 * @example
 * ```typescript
 * const hash = hashBuffer(Buffer.from([0x68, 0x65, 0x6c, 0x6c, 0x6f]));
 * console.log(hash); // '2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824'
 * ```
 */
export declare function hashBuffer(data: Buffer): string;
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