function assertPath(path: string): void {
  if (typeof path !== 'string') {
    throw new TypeError('Path must be a string. Received ' + JSON.stringify(path));
  }
}

export function getServiceUrlWithRoute(serviceUrl: string, route: string): string {
  const url = new URL(serviceUrl);
  url.pathname = joinPath(url.pathname, route);

  return url.toString();
}

export function joinPath(...paths: string[]): string {
  if (paths.length === 0) return '/';

  return paths.reduce((acc, path) => {
    assertPath(path);
    const mappedPath = path.startsWith('/') ? path.slice(1) : path;
    const endsWithSlash = acc.endsWith('/');
    return endsWithSlash ? `${acc}${mappedPath}` : `${acc}/${mappedPath}`;
  }, '/');
}