Function isLocalhost

packages/service-worker/worker/src/driver.ts:79–85

(scope: string)

 * @returns true if the scope is considered localhost, false otherwise
 */
export function isLocalhost(scope: string): boolean {
  // Use non-capturing groups and ensure localhost is at word boundary
  // This prevents matching domains like "mylocalhost.com" while allowing valid localhost URLs
  return /(?:^https?:\/\/)?(?:(?:^|[^\w.])localhost|\[::1\]|127(?:\.\d{1,3}){3})(?::\d+)?(?:\/.*)?$/.test(
    scope,
  );
}

export enum DriverReadyState {
  // The SW is operating in a normal mode, responding to all traffic.