with keyup.enter with shift

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/accounting.js/0.4.1/accounting.min.js"></script>
<script src="https://unpkg.com/vue/dist/vue.js"></script>

<div id="app">
  <textarea
   v-model="message"
   @keyup="typing"
   @keyup.enter="sendMessage"
 ></textarea>
</div>

JavaScript

new Vue({
  el: '#app',
  data: {
    message: ""
  },
  methods: {
    typing () {
       console.log("typing")
       
       
    },
    newLine () {
       console.log("newLine")
    },
    sendMessage (event) {
       if(event.shiftKey){       
         console.log("newLine")
       } else {
              console.log("sendMessage")
       }
    }    
  }
})