Vue js Disable Submit Button if Input File is Empty

<!DOCTYPE html>
<html lang="en">
<head>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
</head>

<body>
  <div id="app">
    <h3>Vue Js Disable Submit Button if Input File is Empty</h3>
  
    <input type="file" v-on:change="updateFile" />

<button v-bind:disabled="isFileEmpty" v-on:click="submitForm">Submit</button>
  </div>

input[type="file"] {
      margin-top: 10px;
    }

button {
      margin-top: 20px;
      padding: 10px 20px;
      background-color: #3498db;
      color: #fff;
      border: none;
      border-radius: 4px;
      cursor: pointer;
      transition: background-color 0.3s;
    }

button:disabled {
      background-color: #95a5a6;
      cursor: not-allowed;
    }

button:hover:enabled {
      background-color: #2980b9;
    }
  </style>
</body>

</html>