In this tutorial attributeChangedCallback is implemented like this:

// attribute change
attributeChangedCallback(property, oldValue, newValue) {

  if (oldValue === newValue) return;
  this[ property ] = newValue;

}

And I’m trying to convert it to Typescript and so far I have this:

// attribute change
attributeChangedCallback(property:keyof HelloWorldComponent, oldValue:any, newValue:any) {
    if (oldValue === newValue) return;
    this[ property ] = newValue;  
  }  
}

However this still creates the error:

Cannot assign to 'ATTRIBUTE_NODE' because it is a read-only property.ts(2540)
Cannot assign to 'CDATA_SECTION_NODE' because it is a read-only property.ts(2540)
Cannot assign to 'COMMENT_NODE' because it is a read-only property.ts(2540)
Cannot assign to 'DOCUMENT_FRAGMENT_NODE' because it is a read-only property.ts(2540)
Cannot assign to 'DOCUMENT_NODE' because it is a read-only property.ts(2540)

Thoughts?