Nothing works, I dont understand modern javascript

crates/librqbit/webui/node_modules/preact/compat/src/Children.js

@@ -0,0 +1,21 @@
+import { toChildArray } from 'preact';
+
+const mapFn = (children, fn) => {
+	if (children == null) return null;
+	return toChildArray(toChildArray(children).map(fn));
+};
+
+// This API is completely unnecessary for Preact, so it's basically passthrough.
+export const Children = {
+	map: mapFn,
+	forEach: mapFn,
+	count(children) {
+		return children ? toChildArray(children).length : 0;
+	},
+	only(children) {
+		const normalized = toChildArray(children);
+		if (normalized.length !== 1) throw 'Children.only';
+		return normalized[0];
+	},
+	toArray: toChildArray
+};