fix(components): improve generic types (#3331)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

src/runtime/utils/index.ts

@@ -81,3 +81,7 @@ export function compare<T>(value?: T, currentValue?: T, comparator?: string | ((
 
   return isEqual(value, currentValue)
 }
+
+export function isArrayOfArray<A>(item: A[] | A[][]): item is A[][] {
+  return Array.isArray(item[0])
+}