code: function Emitter(conn) {
              if (!(this instanceof Emitter)) return new Emitter(conn);
              this.ids = 1;
              this.acks = {};
              this.conn = conn;
              if (this.conn) this.bind();
            }
docs: Initialize a new `Emitter`.
  
  @param {Primus|Spark} conn
  @return {Emitter} `Emitter` instance
  @api public