modrinth/apps/frontend/src/components/ui/AutomaticAccordion.vue

<template>
	<div class="accordion-wrapper" :class="{ 'has-content': hasContent }">
		<div class="accordion-content">
			<div>
				<div v-bind="$attrs" ref="slotContainer" class="content-container">
					<slot />
				</div>
			</div>
		</div>
	</div>
</template>

<script setup lang="ts">
defineOptions({
	inheritAttrs: false,
})

const slotContainer = ref()

const hasContent = ref(false)

const mutationObserver = ref<MutationObserver | null>(null)

function updateContent() {
	if (!slotContainer.value) return false

	hasContent.value = slotContainer.value ? slotContainer.value.children.length > 0 : false
}

onMounted(() => {
	mutationObserver.value = new MutationObserver(updateContent)

	mutationObserver.value.observe(slotContainer.value, {
		childList: true,
	})

	updateContent()
})

onUnmounted(() => {
	if (mutationObserver.value) {
		mutationObserver.value.disconnect()
	}
})
</script>
<style scoped>
.accordion-content {
	display: grid;
	grid-template-rows: 0fr;
	transition: grid-template-rows 0.3s ease-in-out;
}

@media (prefers-reduced-motion) {
	.accordion-content {
		transition: none !important;
	}
}

.has-content .accordion-content {
	grid-template-rows: 1fr;
}

.accordion-content > div {
	overflow: hidden;
}

.accordion-wrapper.has-content {
	display: contents;
}
</style>