export type PlanName = 'free' | 'pro' | 'enterprise';
export interface PlanLimits {
    name: PlanName;
    monthlyMessages: number | 'unlimited';
    monthlyBytes: number | 'unlimited';
}
export interface LicenseConfig {
    apiKey?: string;
    persistUsagePath?: string;
    defaultPlan?: PlanName;
}
export interface UsageRecord {
    monthKey: string;
    messages: number;
    bytes: number;
}
export declare class LicenseManager {
    private config;
    private plan;
    private usage;
    private persistPath?;
    constructor(config?: LicenseConfig);
    getPlan(): PlanLimits;
    verifyApiKey(): boolean;
    private resolvePlan;
    private loadUsage;
    private saveUsage;
    resetIfNewMonth(): void;
    canConsume(deltaMessages: number, deltaBytes: number): {
        ok: boolean;
        reason?: string;
    };
    record(deltaMessages: number, deltaBytes: number): void;
}
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