How to use the @vue/runtime-core.createVNode function in @vue/runtime-core

warn(` children must be keyed.`)
        }
      }

      if (prevChildren) {
        for (let i = 0; i < prevChildren.length; i++) {
          const child = prevChildren[i]
          setTransitionHooks(
            child,
            resolveTransitionHooks(child, cssTransitionProps, state, instance)
          )
          positionMap.set(child, child.el.getBoundingClientRect())
        }
      }

      return createVNode(tag, null, children)
    }
  }