/**
 * Feature gating with optional free-trial counter.
 *
 * Emits `gate_blocked` on denial when an `emit` callback is provided.
 */
import type { Tier } from '../types.js';
import type { TierProvider } from './tier_provider.js';
import type { MessageLog } from '../session/message_log.js';
import type { Emit } from '../events/emit.js';
export interface AccessGateOptions {
    tierProvider: TierProvider;
    log?: MessageLog | null;
    allowedTiers?: Tier[];
    freeMessageLimit?: number;
    emit?: Emit;
}
export type AccessReason = 'tier' | 'trial' | 'denied';
export interface AccessResult {
    allowed: boolean;
    tier: Tier;
    reason: AccessReason;
    remaining: number | null;
}
export declare class AccessGate {
    readonly tierProvider: TierProvider;
    readonly log: MessageLog | null;
    readonly allowedTiers: Tier[];
    readonly freeMessageLimit: number;
    readonly emit: Emit | null;
    constructor({ tierProvider, log, allowedTiers, freeMessageLimit, emit }: AccessGateOptions);
    check(whatsapp: string): Promise<AccessResult>;
}
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