import { IContextOptimizer, ConversationMessage, ContextMetrics } from '../types';
/**
 * Optimizer that applies time-based decay to message importance
 */
export declare class TimeDecayOptimizer implements IContextOptimizer {
    private ageMetric;
    private decayFactor;
    constructor(decayFactor?: number);
    shouldOptimize(metrics: ContextMetrics): boolean;
    optimize(messages: ConversationMessage[]): Promise<ConversationMessage[]>;
}