Is the "Angular is not functioning" error message the result of a missing import?

Encountering an 'is not a function' error in Angular 7 / TypeScript 3, using an EventEmitter. This issue has been extensively discussed (a b), but solutions have not garnered many upvotes (a b c d e f). I am close to resolving it, but need some assistance to get it right.

Check out this StackBlitz example with the error. ...and another similar one without the error.

The only noticeable distinction is that in the case of the error, the event emitter and receiver are located in sibling folders. In the functioning scenario, the event receiver is in a parent folder and the emitter in a child folder.

It appears that some adjustments to import/modules are necessary to fix the malfunctioning setup, but I'm struggling to figure it out. Any suggestions?

https://i.sstatic.net/pQgaw.png

angulartypescripttypeerror

Answer №1

There seems to be a mistake in the parent.component.ts file. In your ts file, you defined the function as parentListner, but in the html file it is called parentListener.

Answer №2

Within your main ts file, there is a method:

childEventFunction($event) {
    this.parentMessage = $event
 }

However, in the corresponding HTML file, you are invoking it as:

<app-child (childEvent)="childEventFunction($event)"></app-child>

It's important that the function names match.

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