1watch: {
2    colors: {
3        handler(newValue){
4            console.log('colors changed', newValue)
5        }, deep: true
6    }
7}

1export default {
2  name: 'ColorChange',
3  props: {
4    colors: {
5      type: Array,
6      required: true,
7    },
8  },
9  watch: {
10    colors: {
11      // This will let Vue know to look inside the array
12      deep: true,
13
14      // We have to move our method to a handler field
15      handler(value) {
16        console.log('The list of colors has changed!', value);
17      }
18    }
19  }
20}

1watch: {
2  item: {
3     handler(val){
4       // do stuff
5     },
6     deep: true
7  }
8}
9