import { type HistoryExpansionPolicy } from '../../domain/behavior/history-expansion-policy.js';
import type { BehaviorEventEmitter } from './behavior-event-emitter.js';
export interface ExpansionRequest {
    readonly reason: string;
    readonly overrideFlag?: 'explicit_user_request' | 'task_policy_exemption' | 'recovery_debug_mode';
}
export interface ExpansionResult {
    readonly allowed: boolean;
    readonly eventType: string;
    readonly reason: string;
}
export declare class HistoryExpansionGate {
    private readonly policy;
    private readonly emitter?;
    constructor(policy: HistoryExpansionPolicy, emitter?: BehaviorEventEmitter);
    evaluate(request: ExpansionRequest): ExpansionResult;
}
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