export declare const SDK_USER_AGENT: string;
/**
 * Sanitize a client identifier string, stripping non-printable ASCII.
 * Returns the cleaned string or `undefined` if nothing usable remains.
 */
export declare const sanitizeClient: (raw: string) => string | undefined;
/**
 * Build the standard SDK headers.
 *
 * - `User-Agent` is always the SDK identifier (e.g. `helius-node-sdk/2.1.0 (server)`).
 * - When a consumer `clientId` is provided (e.g. `helius-mcp/0.3.0`), it is sent
 *   as the `X-Helius-Client` header instead of being stacked in `User-Agent`.
 */
export declare const getSDKHeaders: (clientId?: string) => Record<string, string>;
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