/**
 * cyrb53 — public-domain non-cryptographic 53-bit hash. Good distribution,
 * pure JS, no `node:crypto` needed (the AI package's main entry is
 * runtime-agnostic — see `src/isomorphic-check.test.ts`).
 *
 * Used by provider adapters to derive stable cache keys from request
 * payloads (OpenAI's `prompt_cache_key`, Google's `cachedContents/*`
 * registry). Stable hashing is the goal — not cryptographic strength.
 */
export declare function cyrb53Hex(str: string): string;
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