import { Message, TruncationStrategy, ContextConfig } from '../types';
export interface ITruncationStrategy {
    truncate(messages: Message[], maxTokens: number, tokenCounter: (msg: Message) => Promise<number>): Promise<Message[]>;
}
/**
 * Recent-first strategy: Keep the most recent messages that fit within the token limit
 */
export declare class RecentFirstStrategy implements ITruncationStrategy {
    truncate(messages: Message[], maxTokens: number, tokenCounter: (msg: Message) => Promise<number>): Promise<Message[]>;
}
/**
 * Sliding window strategy: Preserve context boundaries by keeping first N and last M messages
 */
export declare class SlidingWindowStrategy implements ITruncationStrategy {
    private keepFirstN;
    private keepLastM;
    constructor(keepFirstN?: number, keepLastM?: number);
    truncate(messages: Message[], maxTokens: number, tokenCounter: (msg: Message) => Promise<number>): Promise<Message[]>;
}
/**
 * Importance-based strategy: Preserve system messages and important flagged messages
 */
export declare class ImportanceBasedStrategy implements ITruncationStrategy {
    private preserveSystemMessages;
    constructor(preserveSystemMessages?: boolean);
    truncate(messages: Message[], maxTokens: number, tokenCounter: (msg: Message) => Promise<number>): Promise<Message[]>;
}
/**
 * Factory to create truncation strategies
 */
export declare class TruncationStrategyFactory {
    static create(strategy: TruncationStrategy, config?: ContextConfig): ITruncationStrategy;
}
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