TypeError: You provided 'undefined' where a stream was expected

Question

I have an Ionic app that has a user provider with a signup() method:

doSignup() {
  // set         


        

Answer 1

I had the same error and typical scenario was that I was returning different actions based on certain condition. But handling of one condition was missing and I was not returning anything under my effects. That's when this issue came up. It's always better to have a default return action to avoid such instances.

...mergeMap((res: FetchWorkflowStatusResponse) => {
   if(this){
      return action1
   } else if(that){
      return action2
   }
}

Now if some value other than this and that comes then there will not be any return statement and the error will be thrown.