/**
 * Normalizes a URL by applying several transformations:
 * - Ensures the URL has a protocol (uses https:// if missing)
 * - Validates that the hostname contains at least one dot (.)
 * - Removes trailing slashes from paths (except for root path /)
 * - Removes URL fragments/anchors
 *
 * @param url - The URL string to normalize
 * @returns The normalized URL string, or undefined if:
 *   - The URL is invalid
 *   - The hostname doesn't contain a dot
 *   - An error occurs during normalization
 *
 * @example
 * normalizeUrl("example.com/path/") // returns "https://example.com/path"
 * normalizeUrl("https://test.com/page/#section") // returns "https://test.com/page"
 * normalizeUrl("invalid") // returns undefined
 */
export default function normalizeUrl(url: string): string | undefined;
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