import type { CompletionRequest } from '../types/messages.js';
import type { ContextSummarizer, ContextWindowConfig, ContextWindowResult } from '../types/context-window.js';
/** What context-window optimization can call on. */
export interface ContextWindowRuntime {
    /** Summarizes trimmed messages, for the `summarize` strategy. */
    summarizer?: ContextSummarizer;
}
/**
 * Fits a conversation into a context window by keeping recent messages and trimming or summarizing
 * earlier ones.
 */
export declare class ContextWindowManager {
    private config;
    private tokenizer;
    constructor(config?: ContextWindowConfig);
    /** Optimizes a request, summarizing trimmed messages when configured to. */
    optimize(request: CompletionRequest, runtime?: ContextWindowRuntime): Promise<ContextWindowResult<CompletionRequest>>;
    /** What optimization would do, without calling a summarizer. */
    preview(request: CompletionRequest): ContextWindowResult<CompletionRequest>;
    private optimizeInternal;
    private optimizeInternalSync;
    private resultFromSelection;
    private selectMessages;
    private selectByCount;
    private selectByTokens;
    private createSummary;
    private createLocalSummary;
    private summaryInput;
    private summaryMessage;
    private splitMessages;
    private effectiveStrategy;
    private strategy;
    private shouldSummarize;
    private summaryEnabled;
    private summaryMode;
    private summaryConfig;
    private identity;
    private serializeMessages;
    private messageText;
    private partText;
}
export type { ContextSummaryConfig, ContextSummaryInput, ContextSummaryMode, ContextSummarizer, ContextWindowConfig, ContextWindowResult, ContextWindowStrategy, ContextWindowUsage, } from '../types/context-window.js';