/**
 * sha256  — pure-TypeScript SHA-256 implementation (G40 — v1.5.0)
 * ─────────────────────────────────────────────────────────────────
 * Zero runtime dependencies.  Works in Node.js, browsers, Deno, and Bun.
 *
 * Based on the reference algorithm from FIPS 180-4.
 * Not intended for cryptographic security purposes — used only for cache
 * content-hash keying (G40).
 *
 * Usage
 * ─────
 *  import { sha256Hex } from './sha256';
 *  const hash = sha256Hex('hello world');   // 'b94d27b9...'
 */
/**
 * Compute the SHA-256 hash of a UTF-8 string and return it as a hex string.
 *
 * @example
 * sha256Hex('hello')  // '2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824'
 */
export declare function sha256Hex(input: string): string;
/**
 * Compute the SHA-256 hash of a UTF-8 string and return the first `len`
 * hex characters (default 16 — 64-bit prefix, collision-resistant for cache keys).
 */
export declare function sha256Short(input: string, len?: number): string;
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