/**
 * LicenseChecker — Verifies Pro license keys.
 *
 * Verification strategy (two-tier):
 *   1. Online  → POST to api.csv-super.dev (3s timeout)
 *   2. Offline → Local JWT signature verification (fallback when no network)
 *
 * The offline fallback ensures Pro features keep working even when
 * the verification server is temporarily unreachable.
 *
 * License keys are JWTs signed with csv-super.dev's private RSA key.
 * This file contains only the public key — the private key never leaves
 * csv-super.dev servers.
 */
import type { LicenseInfo } from '../types/index.js';
export declare class LicenseChecker {
    private static cache;
    /**
     * Verify a license key and return full license info.
     *
     * @throws LicenseError on invalid/expired/malformed key.
     */
    static verify(licenseKey: string): Promise<LicenseInfo>;
    /**
     * Quick boolean check — returns true/false instead of throwing.
     */
    static isValid(licenseKey: string): Promise<boolean>;
    private static verifyOnline;
    private static verifyOffline;
    /** Clear the in-process cache (useful in tests). */
    static clearCache(): void;
}
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