Vue counter (Composition API - not working)

by nolleto

HTML

<script src="https://unpkg.com/vue@next"></script>
<body>
  <div id="app">
    <counter-component /> 
  </div>
</body>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

h2 {
  margin-bottom: 8px;
}

JavaScript

const { createApp } = Vue

const app = createApp({});

const useCounter = () => {
  let counter = 3
	
	const increment = () => {
    counter = counter + 1
  }

  const decrement = () => {
		counter = counter - 1
	}

	return { counter, increment, decrement }
}

app.component('counter-component', {
  setup() {
    const { counter, increment, decrement } = useCounter()
    
    return { counter, increment, decrement }
  },
  
  template: `
	<div>
	  <h2>Counter: {{ counter }}</h2>

  	<button @click="increment">Increment</button>
	  <button @click="decrement">Decrement</button>
	</div>
  `
})

app.mount("#app");