import type { Message } from '../session/session-jsonl.js';
export type CompactReason = 'run_start' | 'overflow' | 'proactive' | 'manual_compact';
export declare function buildCompactionCheckpointOutline(summary: string | undefined): string[] | undefined;
export interface PreCompactContext {
    sessionKey: string;
    runId: string;
    messages: Message[];
    reason: CompactReason;
}
export interface PostCompactContext {
    sessionKey: string;
    runId: string;
    summaryChars: number;
    droppedMessages: number;
    reason: CompactReason;
    success: boolean;
    checkpointOutline?: string[];
}
export type PreCompactHook = (ctx: PreCompactContext) => Promise<void>;
export type PostCompactHook = (ctx: PostCompactContext) => Promise<void>;
export declare class CompactHookRegistry {
    private preHooks;
    private postHooks;
    registerPre(hook: PreCompactHook): void;
    registerPost(hook: PostCompactHook): void;
    runPreHooks(ctx: PreCompactContext): Promise<void>;
    runPostHooks(ctx: PostCompactContext): Promise<void>;
}
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