/**
 * Equivalence key for matching two URLs that point at the same resource
 * across protocol (http/https), www. prefix, trailing slash, and casing.
 * Returns `null` for unparseable input.
 *
 * Example: `https://www.Example.com/Foo/` → `example.com/foo`
 */
declare function urlMatchKey(url: string): string | null;
export { urlMatchKey };