Quiz: A Stuck Tip Jar

Each click on the button should put €1 into the tip jar, but the page stays at €0, and each click puts this into the console:

TypeError: Assignment to constant variable.

Click the line with the mistake.

<script setup>
import { ref } from "vue";

const tips = ref(0);

function addTip() {
    tips++;
}
</script>

<template>
    <h1>Corner Café</h1>
    <p class="tips">Tip jar: €{{ tips }}</p>
    <button @click="addTip">Leave a €1 tip</button>
</template>
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