Function normalizeRef

packages/runtime-core/src/vnode.ts:439–454

({
  ref,
  ref_key,
  ref_for,
}: VNodeProps)

  key != null ? key : null

const normalizeRef = ({
  ref,
  ref_key,
  ref_for,
}: VNodeProps): VNodeNormalizedRefAtom | null => {
  if (typeof ref === 'number') {
    ref = '' + ref
  }
  return (
    ref != null
      ? isString(ref) || isRef(ref) || isFunction(ref)
        ? { i: currentRenderingInstance, r: ref, k: ref_key, f: !!ref_for }
        : ref
      : null
  ) as any
}

function createBaseVNode(
  type: VNodeTypes | ClassComponent | typeof NULL_DYNAMIC_COMPONENT,