/**
 * Calculates a checksum for the given content using the specified algorithm.
 * @param content The content to checksum (Buffer or string).
 * @param algorithm The hashing algorithm to use (e.g., 'sha256', 'md5'). Defaults to 'sha256'.
 * @returns A Promise that resolves to the hex-encoded checksum string.
 */
export declare function calculateChecksum(content: Buffer | string, algorithm?: string): Promise<string>;
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