/**
 * Utility function to validate an incoming request is indeed from SignalWire
 *
 * @param {string} privateKey - The "SIGNING KEY", as seen in the SignalWire API page
 * @param {string} header - The value of the X-SignalWire-Signature header from the request
 * @param {string} url - The full URL (with query string) you configured to handle this request
 * @param {string} rawBody - The raw body of the request (JSON string)
 * @returns {boolean} - Whether the request is valid or not
 */
export declare const validateRequest: (privateKey: string, header: string, url: string, rawBody: string) => boolean;
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