/**
 * Computes the SHA-256 hash of a file’s contents and returns it as a Base64 string.
 *
 * @param {string} fileName - Path to the file whose contents will be hashed.
 * @returns {string} The Base64-encoded SHA-256 hash of the file contents.
 *
 * @example
 * shaFile('data.txt'); // e.g. "X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE="
 */
export declare function shaFileBase64(fileName: string): string;
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