svelte/test/runtime/samples/component-event-not-stale/main.html

<Button on:click="handleClick()">one</Button>
<Button on:click="fire('value', {value})">two</Button>

<script>
	import Button from './Button.html';

	export default {
		components: {
			Button
		},

		methods: {
			handleClick() {
				const { value } = this.get();
				this.fire('value', { value });
			}
		}

	}
</script>