/**
 * Generates a SHA-256 hash of a given string and returns it as a hexadecimal string.
 *
 * Unlike `sha()` which returns Base64, this function outputs a lowercase hexadecimal digest.
 * It’s suitable for checksums, integrity validation, or deterministic cache keys.
 *
 * Uses SHA-256 — a cryptographically secure algorithm.
 *
 * @param content - The input string to hash.
 * @returns The SHA-256 hash as a hexadecimal string.
 *
 * @example
 * shaHex('hello');
 * // returns '2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7901e9c6629e7a4bce9a3'
 */
export declare function shaHex(content: string): string;
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