Vue3: Check if event listener is bound to component instance

Question

I have a reusable Badge component. I want to be able to add a close/delete button when an onDelete event listener is present on the component instance.

<template>
    <div class="flex inline-flex items-center px-2.5 py-0.5 text-xs font-medium select-none" :class="[square ? '' : 'rounded-full']">
        <slot />
        <button class="cursor-pointer ml-2" @click="$emit('onDelete')">
            <XIcon class="flex-shrink-0 h-3.5 w-3.5 text-gray-400 hover:text-gray-500" aria-hidden="true" />
        </button>
    </div>
</template>

<script>
    import { XIcon } from '@heroicons/vue/solid';

    export default {
        props: {
            color: { type: String },
            square: { type: Boolean, default: false },
        },
        components: {
            XIcon,
        },
        emits: ['onDelete'],
    };
</script>

If I add a v-if statement to the button, the emit event is executed immediately

<button v-if="$emit('onDelete')" class="cursor-pointer ml-2" @click="$emit('onDelete')">

I'm using Vue 3