title: VUE Watch and Prop
body: <p>In my componant, i watch a props name "menu".</p>
  
  <p>I want in this method, get the value of another props name "allowNext".</p>
  
  <pre><code>menu: {
    handler: () =&gt; {
      console.log(this.allowNext); !!! FAIL !!!
      console.log(this.props.allowNext); !!! FAIL !!!
      if(this.allowNext){
          // DO SOMETHING
      } 
    },
    deep: true,
  },
  </code></pre>
  
  <p>Vue said : 'props in undefined'. 
  So, when menu changed, i need to check if prop allowNext is true (false by default) to do something.</p>
  
  <p>PS : I don't want if possible add another props for communicate.</p>