legacy mode fix

Author: Rich-Harris

packages/repl/src/lib/Output/AstNode.svelte

@@ -34,7 +34,9 @@
 	$effect(() => {
 		if (active && typeof value === 'object' && value !== null) {
 			workspace.onselect((from, to) => {
-				const nodes = value.type === 'Fragment' ? value.nodes : is_array ? value : [value];
+				// legacy fragments have `children`
+				const nodes =
+					value.type === 'Fragment' ? value.nodes ?? value.children : is_array ? value : [value];
 
 				const start = nodes[0]?.start;
 				const end = nodes[nodes.length - 1]?.end;