Function hasOwn

packages/engine.io/lib/server.ts:170–172

(obj: Record<string, any>, key: string)

// Object.hasOwn() was introduced in Node.js 16.9
function hasOwn(obj: Record<string, any>, key: string): boolean {
  return Object.prototype.hasOwnProperty.call(obj, key);
}

export abstract class BaseServer extends EventEmitter {
  public opts: ServerOptions;