title: Vuejs : mapMutations
body: <p>I'm beginner with Vues.js and i'm asking something about mapMutation method.
  I want to pass parameters with this method but i don't know how.
  I want to transform my two methods by using mapMutations :</p>
  
  <pre><code>increment() {
     this.$store.commit(M_COUNT_INCREMENT, {
        amount: 1,
     });
  },
  decrement() {
     this.$store.commit(M_COUNT_DECREMENT, {
         amount: 1,
     });
  },
  </code></pre>
  
  <p>I want do thing like this but with passing my "amount" parameter :</p>
  
  <pre><code>...mapMutations({
     increment: M_COUNT_INCREMENT,
     decrement: M_COUNT_DECREMENT,
  }),
  </code></pre>
  
  <p>Any idea ? </p>
  
  <p>Thank's </p>