Display static warning message upon LWC's creation

Question

Is it possible to display a warning toast event msg whenever a component is created?

Basically, without triggering it in any way, like with a btn click.

.js

showMsg(){
 const evt = new ShowToastEvent({
  title: 'Toast Warning',
  message: 'Warning!',
  variant: 'warning',
  mode: 'sticky'
 });
 this.dispatchEvent(evt);
}

.html

<div class="warning" onnotification={showMsg}></div> 

'Cause right now it obviously isn't working.

If not with an event, how can I achieve that? (Trying to avoid custom css)

Answer 1

By the way, my bad, I am using this component embedded in a VF page through an aura wrapper app so what I was trying to do wouldn't work. I will make it work with slds-notify instead.