Framework7 V3 :Why getting [__ob__: Observer] and not value when I try printing console log

Questions
1

why getting [ob: Observer] and not value when I try printing console log
console.log(this.$root.categories)
It was working fine in V2 but it is not working in V3

I have a data function which is first assigned an empty array and resolving the asynchronous call using Promise.

When I try console.log(this.$root) there is showing variable categories having all the values returned by the ajax call.

2

This is called Getters in JavaScript, it doesn’t affect anything, just click on this [ob: Observer] in console