Function normalizeVNode

packages/runtime-core/src/vnode.ts:788–808

(child: VNodeChild)

}

export function normalizeVNode(child: VNodeChild): VNode {
  if (child == null || typeof child === 'boolean') {
    // empty placeholder
    return createVNode(Comment)
  } else if (isArray(child)) {
    // fragment
    return createVNode(
      Fragment,
      null,
      // #3666, avoid reference pollution when reusing vnode
      child.slice(),
    )
  } else if (isVNode(child)) {
    // already vnode, this should be the most common since compiled templates
    // always produce all-vnode children arrays
    return cloneIfMounted(child)
  } else {
    // strings and numbers
    return createVNode(Text, null, String(child))
  }
}

// optimized normalization for template-compiled render fns
export function cloneIfMounted(child: VNode): VNode {