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svelte/documentation/tutorial/05-events/05-event-forwarding/app-a/Inner.svelte

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<script>
import { createEventDispatcher } from 'svelte';
const dispatch = createEventDispatcher();
function sayHello() {
dispatch('message', {
text: 'Hello!'
});
}
</script>
<button on:click={sayHello}> Click to say hello </button>