import type { GenerationAttemptInput, RequestFingerprintV1 } from "../types.js";
export declare const REQUEST_FINGERPRINT_VERSION: 1;
export declare const REQUEST_FINGERPRINT_SERIALIZER_VERSION: 1;
/**
 * Captures hashes and byte counts from the exact JSON string passed to fetch.
 * The returned value has no request body, header, URL, or decoded JSON values.
 */
export declare function fingerprintFinalRequest(input: Pick<GenerationAttemptInput, "provider" | "model">, body: BodyInit | null | undefined): RequestFingerprintV1 | undefined;
export type PrefixAffinityClassification = "exact_append_eligible" | "partial_prefix_eligible" | "not_eligible" | "unknown";
export declare function classifyPrefixAffinity(prior: RequestFingerprintV1 | undefined, next: RequestFingerprintV1 | undefined): PrefixAffinityClassification;