export interface LicenseResult {
    valid: boolean;
    tier: 'core' | 'pro';
    expires_at?: string;
    cached?: boolean;
    offline_grace?: boolean;
}
export declare class LicenseValidator {
    private cache;
    /**
     * Validate a license key. Returns tier info.
     * - Checks format first (fast reject)
     * - Uses 24h in-memory cache
     * - Falls back to Supabase REST API
     * - Offline grace: trusts cache for 72h if Supabase unreachable
     */
    validate(key: string): Promise<LicenseResult>;
    /**
     * Pre-validate a key on startup (fire and forget).
     */
    prevalidate(key: string): Promise<void>;
    /**
     * Check if a key is currently valid (from cache only, no network).
     */
    getCachedResult(key: string): LicenseResult | null;
    private hashKey;
    private remoteValidate;
}
export declare function getLicenseValidator(): LicenseValidator;
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