/**
 * Smart Windowing — Programmatic context compaction
 *
 * Three-zone architecture:
 *   Zone 1 (recent): Intact — last N tokens of conversation
 *   Zone 2 (middle): Soft-compacted — importance-aware truncation
 *   Zone 3 (old):    Event log — one line per turn
 *
 * Trigger: total history tokens > targetHistoryTokens
 * Method: Purely programmatic (zero LLM calls)
 *
 * @see /workspace/project-docs/00-requirements/compilr-dev-agents/smart-windowing-spec.md
 */
import type { Message } from '../providers/types.js';
export interface WindowingConfig {
    /** Target maximum tokens for conversation history. Default: 60000 */
    targetHistoryTokens: number;
    /** Tokens reserved for recent window (never compacted). Default: 15000 */
    recentWindowTokens: number;
    /** Whether windowing is enabled. Default: true */
    enabled: boolean;
}
export declare const DEFAULT_WINDOWING_CONFIG: WindowingConfig;
export type ImportanceLevel = 'high' | 'medium' | 'low';
export interface TurnPair {
    /** User messages (usually 1, may include tool_result follow-ups) */
    userMessages: Message[];
    /** Assistant messages (1+ including tool loops) */
    assistantMessages: Message[];
    /** Total tokens for this turn pair */
    tokenCount: number;
    /** Importance score */
    importance: ImportanceLevel;
}
interface Zones {
    recent: TurnPair[];
    middle: TurnPair[];
    old: TurnPair[];
}
export interface WindowingResult {
    /** Whether windowing was applied */
    applied: boolean;
    /** Messages after windowing */
    messages: Message[];
    /** Tokens before windowing */
    tokensBefore: number;
    /** Tokens after windowing */
    tokensAfter: number;
    /** Zone sizes */
    zones: {
        recent: number;
        middle: number;
        old: number;
    };
    /** Importance distribution */
    importanceCounts: Record<ImportanceLevel, number>;
}
export declare function groupIntoTurnPairs(messages: Message[]): TurnPair[];
export declare function identifyZones(turnPairs: TurnPair[], config: WindowingConfig): Zones;
export declare function scoreTurnImportance(pair: TurnPair, allPairs: TurnPair[], index: number): ImportanceLevel;
export declare function softCompact(turnPairs: TurnPair[]): Message[];
export declare function compactToEventLog(turnPairs: TurnPair[]): Message[];
export declare function applyWindowing(messages: Message[], config?: WindowingConfig): WindowingResult;
export {};