/**
 * Computes the SHA-256 hash of a file’s contents and returns it as a hexadecimal string.
 *
 * @param {string} fileName - Path to the file whose contents will be hashed.
 * @returns {string} The SHA-256 hash of the file contents, encoded as a hex string.
 *
 * @example
 * shaFileForUrl('data.txt'); // "a591a6d40bf420404a011733cfb7b190..."
 *
 */
export declare function shaFileHex(fileName: string): string;
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