Function ensureValidVNode

packages/runtime-core/src/helpers/renderSlot.ts:103–118

(
  vnodes: VNodeArrayChildren,
)

}

export function ensureValidVNode(
  vnodes: VNodeArrayChildren,
): VNodeArrayChildren | null {
  return vnodes.some(child => {
    if (!isVNode(child)) return true
    if (child.type === Comment) return false
    if (
      child.type === Fragment &&
      !ensureValidVNode(child.children as VNodeArrayChildren)
    )
      return false
    return true
  })
    ? vnodes
    : null
}