/**
 * Lemma KeyManager
 *
 * Handles Pro license key lifecycle:
 * - Activation via remote validation (https://lemma.nxus.studio/api/v1/validate)
 * - Graceful fallback to local format check when endpoint is unreachable
 * - Persistence to ~/.lemma-cache/license.json
 * - Auto-migration from legacy license.key format
 *
 * TODO(v0.4.0): Replace HTTP validate call with direct PostgreSQL check.
 */
/**
 * Validates the license key locally using a SHA-256 cryptographic checksum.
 * Format: LEMMA-PRO-XXXX-YYYY-ZZZZ where ZZZZ is the first 4 chars of SHA256(LEMMA-PRO-XXXX-YYYY + OFFLINE_SALT).
 */
export declare function verifyOfflineKey(key: string): boolean;
export interface LicenseData {
    key: string;
    tier: 'pro' | 'free';
    isPro: boolean;
    activatedAt: string;
    expiresAt?: string;
    lastValidatedAt?: string;
    validatedRemotely: boolean;
    email?: string;
}
export interface ActivationResult {
    success: boolean;
    isPro: boolean;
    message: string;
    license?: LicenseData;
    validatedRemotely: boolean;
}
export declare class KeyManager {
    private license;
    private isCheckingHeartbeat;
    constructor();
    isPro(): boolean;
    private checkHeartbeat;
    getLicenseKey(): string | null;
    getLicense(): LicenseData | null;
    /**
     * Activate a license key.
     * Attempts remote validation first; falls back to format-check if unreachable.
     */
    activate(key: string): Promise<ActivationResult>;
    /**
     * Deactivate / remove the current license.
     */
    deactivate(): void;
    /**
     * Reload license from disk (used after activate from another process).
     */
    reload(): void;
    private load;
    private save;
    private ensureCacheDir;
    /**
     * POST to https://lemma.nxus.studio/api/v1/validate with a timeout.
     * Returns the JSON response body.
     */
    private validateRemote;
}
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