/**
 * Sanitizes and formats a given href string.
 *
 * This function checks if the provided href is a non-null string and trims it.
 * It supports hrefs that start with "mailto:", "tel:", or "/", returning them as is.
 * If the href is a valid email, it prefixes it with "mailto:". If it's a valid phone number,
 * it prefixes it with "tel:". Otherwise, returns the trimmed href.
 *
 * @param {string} [href] - The href string to sanitize.
 * @returns {string} - The sanitized and potentially prefixed href.
 */
export declare const sanitizeHref: (href?: string) => string;