import type { CacheStrategy, PromptEntry } from "./types.js";
/** Create a deterministic compaction summary that is byte-stable after creation. */
export declare function createSummaryEntry(cutTurn: number, summaryTokens: number): PromptEntry;
/** Baseline: never compact. Prompt grows monotonically (best cache, until overflow). */
export declare function keepAll(): CacheStrategy;
/** Continuous sliding window: always keep only the last `windowTurns` entries. */
export declare function truncateSliding(windowTurns: number): CacheStrategy;
/** Batched truncation: cut to the last `keepLastTurns` entries once per `cutEveryTurns`. */
export declare function truncateBatched(cutEveryTurns: number, keepLastTurns: number): CacheStrategy;
/** Batched summarization: replace the dropped span with a fixed-size summary. */
export declare function summarizeBatched(cutEveryTurns: number, keepRecentTurns: number, summaryTokens: number): CacheStrategy;
/**
 * Mirror the fork's autoOlderHistory policy: when estimated context tokens exceed
 * `contextWindow * ratio`, replace the older span with a summary and keep a raw
 * recent tail of ~`keepRecentTokens` tokens.
 */
export declare function summarizeOnTokenRatio(contextWindow: number, ratio: number, keepRecentTokens: number, summaryTokens: number): CacheStrategy;
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