svelte/test/runtime/samples/action-ternary-template/main.html

<h1 use:insert="display ? `Hello ${target}` : ''"></h1>

<script>
	export default {
		actions: {
			insert(node, text) {

				function onClick() {
					node.textContent = text;
				}
				node.addEventListener('click', onClick);

				return {
					destroy() {
						node.removeEventListener('click', onClick);
					}
				}
			}
		}
	}
</script>