Function extend

packages/socket.io/client-dist/socket.io.js:2654–2658

(namespace, delimiter)

      return debug;
    }
    function extend(namespace, delimiter) {
      var newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace);
      newDebug.log = this.log;
      return newDebug;
    }

    /**
    * Enables a debug mode by namespaces. This can include modes