How do I rewrite this to include a debug statement?

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When you use .bind(this) on the onSuccess function, it’s making the context of this the window or global object – try removing it. It should be trivial to throw debug logic in there, but given the binding and explicit declaring of context it looks like you may or may not be trying to achieve something more similar to this…

// ...

receiveRequest: function(callback) {
  console.log('received');
  callback();
},
onSuccess: function (cb) {                      
  console.log({'XXX: onSuccess': this});         
  return this.receiveRequest.bind(this, cb)
}

// ...

var requestReceivedFunc = myObj.onSuccess(function() {
   console.log('my callback'); 
});
requestReceivedFunc();

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