Avoid mutating a prop directly since the value will be overwritten

Question

I have very common problem with upgrading to Vue 2.0

I am getting warning:

Avoid mutating a prop directly since the value will be overwritte

Answer 1

From Vue 2.3.0 on you can use the .sync modifier:

Sample from https://vuejs.org/v2/guide/components-custom-events.html#sync-Modifier:

and in your controller...

this.$emit('update:title', newTitle)