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svelte/test/runtime/samples/flush-before-bindings/main.html

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<script>
import { beforeUpdate } from 'svelte';
import Nested from './Nested.html';
export let snapshots;
export let visibleThings = [];
beforeUpdate(() => {
if (!snapshots) {
// first run
snapshots = [];
}
snapshots.push(visibleThings);
});
</script>
<Nested bind:visibleThings={visibleThings} />