wip: rewrite core to be template focused

packages/core/src.old/nodes/fragment.rs

@@ -0,0 +1,16 @@
+use crate::{ElementId, VNode};
+use std::cell::Cell;
+
+/// A list of VNodes with no single root.
+pub struct VFragment<'src> {
+    /// The key of the fragment to be used during keyed diffing.
+    pub key: Option<&'src str>,
+
+    /// The [`ElementId`] of the placeholder if it exists
+    pub placeholder: Cell<Option<ElementId>>,
+
+    /// Fragments can never have zero children. Enforced by NodeFactory.
+    ///
+    /// You *can* make a fragment with no children, but it's not a valid fragment and your VDom will panic.
+    pub children: &'src [VNode<'src>],
+}