import type { TokenUsage, UsageContext } from "../types/index.js";
/** Convert proxy wire usage into disjoint billing buckets. Codex input already
 * includes cache tokens; reasoning is included in output for both providers.
 * OpenAI's documented formula subtracts both cached_tokens and cache_write_tokens:
 * https://developers.openai.com/api/docs/guides/prompt-caching#monitor-cache-performance
 */
export declare function proxyTokenUsage(usage: UsageContext): TokenUsage;
/**
 * Read Anthropic's `usage.cache_creation.ephemeral_1h_input_tokens` — the
 * 1-hour-TTL share of `cache_creation_input_tokens` — from an untyped usage
 * object. Returns undefined when the breakdown is absent (older replies, or a
 * request that wrote no 1h breakpoint), so callers leave the field unset and
 * price exactly as before.
 */
export declare function readCacheCreation1hTokens(usage: unknown): number | undefined;
/**
 * Spread target for a usage literal: the key exists only when a 1h count was
 * observed, so every payload without one keeps its exact old shape.
 */
export declare function oneHourCacheWriteFields(count: number | undefined): {
    cacheCreation1hTokens?: number;
};