/**
 * License Key Validation for GitMem Pro Tier
 *
 * Detection chain:
 *   1. GITMEM_TIER env var (explicit override — testing/dev)
 *   2. api_key in config.json or GITMEM_API_KEY env var:
 *      a. Check license-cache.json → if valid + not expired (72h) → return cached tier
 *      b. No cache → optimistic "pro" (validated async in runServer)
 *   3. No key + no SUPABASE_URL + no config.supabase_url → free
 *   4. No key + SUPABASE_URL set (env var) → pro (backward compat for us)
 *
 * Async validation (validateLicense()):
 *   - Called in runServer() startup (non-blocking)
 *   - POST to hardcoded validation endpoint with api_key + install_id
 *   - Success: cache to ~/.gitmem/license-cache.json (72h TTL)
 *   - Failure: downgrade _tier to free, log warning
 *   - Network error: honor existing cache if valid, else downgrade
 */
export interface LicenseValidationResult {
    valid: boolean;
    tier: string | null;
    message: string;
}
/**
 * Get license key from env var or config.json
 */
export declare function getLicenseKey(): string | null;
/**
 * Get Pro config (Supabase + OpenRouter credentials) from config.json
 * Env vars override config.json values.
 */
export declare function getProConfig(): {
    supabaseUrl: string;
    supabaseKey: string;
    openrouterKey: string;
};
/**
 * Delete license cache (used by deactivate)
 */
export declare function clearLicenseCache(): void;
/**
 * Check if license key has a valid cached result (non-async, for tier detection)
 */
export declare function getCachedLicenseTier(): string | null;
/**
 * Validate license key against GitMem's Supabase RPC endpoint.
 * Calls gitmem_validate_license() via PostgREST using the anon key.
 * Returns the validation result.
 *
 * This is async and should be called non-blocking during startup.
 */
export declare function validateLicense(apiKey: string, installId: string): Promise<LicenseValidationResult>;
/**
 * Get the validation URL (for diagnostics/testing)
 */
export declare function getValidationUrl(): string;
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