Move files in preparation for monorepo migration

apps/knossos/utils/vue-children.ts

@@ -0,0 +1,25 @@
+import { createTextVNode, isVNode, toDisplayString, type VNode } from 'vue'
+
+/**
+ * Checks whether a specific child is a VNode. If not, converts it to a display
+ * string and then creates text VNode for the result.
+ *
+ * @param child Child to normalize.
+ * @returns Either the original VNode or a text VNode containing child converted
+ * to a display string.
+ */
+function normalizeChild(child: any): VNode {
+  return isVNode(child) ? child : createTextVNode(toDisplayString(child))
+}
+
+/**
+ * Takes in an array of VNodes and other children. It then converts each child
+ * that is not already a VNode to a display string, and creates a text VNode for
+ * that string.
+ *
+ * @param children Children to normalize.
+ * @returns Children with all of non-VNodes converted to display strings.
+ */
+export function normalizeChildren(children: any | any[]): VNode[] {
+  return Array.isArray(children) ? children.map(normalizeChild) : [normalizeChild(children)]
+}