How To Refactor This, Without Using SetTimeout

hack-with-set-timeout.js

child.on("start", function(forever) {
   //A bit of a hack, but we delay before calling the callback because we want to see if error or exit events are fired.
   setTimeout(function() {
      typeof this.callback === "function" ? this.callback.call() : null;
   }.bind({ callback: this.callback }), 500);
}.bind({ callback: callback }));

child.on("exit", function(forever) {
   typeof this.callback === "function" ? this.callback.call() : null;
}.bind({ callback: callback }));

child.on("error", function(err) {
   typeof this.callback === "function" ? this.callback.call() : null;
}.bind({ callback: callback }));