docs/packages/base-ui/src/utils/urls.ts

export function normalize(urlOrPath: string) {
  if (urlOrPath.length > 1 && urlOrPath.endsWith('/')) return urlOrPath.slice(0, -1);
  return urlOrPath;
}

/**
 * @returns if `href` is matching the given pathname
 */
export function isActive(href: string, pathname: string, nested = false): boolean {
  href = normalize(href);
  pathname = normalize(pathname);

  return href === pathname || (nested && pathname.startsWith(`${href}/`));
}