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isArray,
isFunction,
isString,
isObject,
EMPTY_ARR,
extend,
normalizeClass,
normalizeStyle,
PatchFlags,
ShapeFlags,
SlotFlags,
isOn
} from '@vue/shared'
import {
ComponentInternalInstance,
Data,
ConcreteComponent,
ClassComponent,
Component,
isClassComponent
} from './component'
import { RawSlots } from './componentSlots'
import { isProxy, Ref, toRaw, ReactiveFlags, isRef } from '@vue/reactivity'
import { AppContext } from './apiCreateApp'
import {
SuspenseImpl,
isSuspense,
SuspenseBoundary
} from './components/Suspense'
import { DirectiveBinding } from './directives'
import { TransitionHooks } from './components/BaseTransition'
import { warn } from './warning'
import { TeleportImpl, isTeleport } from './components/Teleport'
import {
currentRenderingInstance,
currentScopeId
} from './componentRenderContext'
import { RendererNode, RendererElement } from './renderer'
import { NULL_DYNAMIC_COMPONENT } from './helpers/resolveAssets'
import { hmrDirtyComponents } from './hmr'
import { convertLegacyComponent } from './compat/component'
import { convertLegacyVModelProps } from './compat/componentVModel'
import { defineLegacyVNodeProperties } from './compat/renderFn'
import { callWithAsyncErrorHandling, ErrorCodes } from './errorHandling'
export const Fragment = Symbol(__DEV__ ? 'Fragment' : undefined) as any as {
__isFragment: true
new (): {
$props: VNodeProps
}
}
export const Text = Symbol(__DEV__ ? 'Text' : undefined)
export const Comment = Symbol(__DEV__ ? 'Comment' : undefined)
export const Static = Symbol(__DEV__ ? 'Static' : undefined)
export type VNodeTypes =
| string
| VNode
| Component
| typeof Text
| typeof Static
| typeof Comment
| typeof Fragment
| typeof TeleportImpl
| typeof SuspenseImpl
export type VNodeRef =
| string
| Ref
| ((ref: object | null, refs: Record<string, any>) => void)
export type VNodeNormalizedRefAtom = {
i: ComponentInternalInstance
r: VNodeRef
k?: string // setup ref key
f?: boolean // refInFor marker
}
export type VNodeNormalizedRef =
| VNodeNormalizedRefAtom
| VNodeNormalizedRefAtom[]
type VNodeMountHook = (vnode: VNode) => void
type VNodeUpdateHook = (vnode: VNode, oldVNode: VNode) => void
export type VNodeHook =
| VNodeMountHook
| VNodeUpdateHook
| VNodeMountHook[]
| VNodeUpdateHook[]
// https://github.com/microsoft/TypeScript/issues/33099
export type VNodeProps = {
key?: string | number | symbol
ref?: VNodeRef
ref_for?: boolean
ref_key?: string
// vnode hooks
onVnodeBeforeMount?: VNodeMountHook | VNodeMountHook[]
onVnodeMounted?: VNodeMountHook | VNodeMountHook[]
onVnodeBeforeUpdate?: VNodeUpdateHook | VNodeUpdateHook[]
onVnodeUpdated?: VNodeUpdateHook | VNodeUpdateHook[]
onVnodeBeforeUnmount?: VNodeMountHook | VNodeMountHook[]
onVnodeUnmounted?: VNodeMountHook | VNodeMountHook[]
}
type VNodeChildAtom =
| VNode
| string
| number
| boolean
| null
| undefined
| void
export type VNodeArrayChildren = Array<VNodeArrayChildren | VNodeChildAtom>
export type VNodeChild = VNodeChildAtom | VNodeArrayChildren
export type VNodeNormalizedChildren =
| string
| VNodeArrayChildren
| RawSlots
| null
export interface VNode<
HostNode = RendererNode,
HostElement = RendererElement,
ExtraProps = { [key: string]: any }
> {
/**
* @internal
*/
__v_isVNode: true
/**
* @internal
*/
[ReactiveFlags.SKIP]: true
type: VNodeTypes
props: (VNodeProps & ExtraProps) | null
key: string | number | symbol | null
ref: VNodeNormalizedRef | null
/**
* SFC only. This is assigned on vnode creation using currentScopeId
* which is set alongside currentRenderingInstance.
*/
scopeId: string | null
/**
* SFC only. This is assigned to:
* - Slot fragment vnodes with :slotted SFC styles.
* - Component vnodes (during patch/hydration) so that its root node can
* inherit the component's slotScopeIds
* @internal
*/
slotScopeIds: string[] | null
children: VNodeNormalizedChildren
component: ComponentInternalInstance | null
dirs: DirectiveBinding[] | null
transition: TransitionHooks<HostElement> | null
// DOM
el: HostNode | null
anchor: HostNode | null // fragment anchor
target: HostElement | null // teleport target
targetAnchor: HostNode | null // teleport target anchor
/**
* number of elements contained in a static vnode
* @internal
*/
staticCount: number
// suspense
suspense: SuspenseBoundary | null
/**
* @internal
*/
ssContent: VNode | null
/**
* @internal
*/
ssFallback: VNode | null
// optimization only
shapeFlag: number
patchFlag: number
/**
* @internal
*/
dynamicProps: string[] | null
/**
* @internal
*/
dynamicChildren: VNode[] | null
// application root node only
appContext: AppContext | null
/**
* @internal attached by v-memo
*/
memo?: any[]
/**
* @internal __COMPAT__ only
*/
isCompatRoot?: true
/**
* @internal custom element interception hook
*/
ce?: (instance: ComponentInternalInstance) => void
}
// Since v-if and v-for are the two possible ways node structure can dynamically
// change, once we consider v-if branches and each v-for fragment a block, we
// can divide a template into nested blocks, and within each block the node
// structure would be stable. This allows us to skip most children diffing
// and only worry about the dynamic nodes (indicated by patch flags).
export const blockStack: (VNode[] | null)[] = []
export let currentBlock: VNode[] | null = null
/**
* Open a block.
* This must be called before `createBlock`. It cannot be part of `createBlock`
* because the children of the block are evaluated before `createBlock` itself
* is called. The generated code typically looks like this:
*
* ```js
* function render() {
* return (openBlock(),createBlock('div', null, [...]))
* }
* ```
* disableTracking is true when creating a v-for fragment block, since a v-for
* fragment always diffs its children.
*
* @private
*/
export function openBlock(disableTracking = false) {
blockStack.push((currentBlock = disableTracking ? null : []))
}
export function closeBlock() {
blockStack.pop()
currentBlock = blockStack[blockStack.length - 1] || null
}
// Whether we should be tracking dynamic child nodes inside a block.
// Only tracks when this value is > 0
// We are not using a simple boolean because this value may need to be
// incremented/decremented by nested usage of v-once (see below)
export let isBlockTreeEnabled = 1
/**
* Block tracking sometimes needs to be disabled, for example during the
* creation of a tree that needs to be cached by v-once. The compiler generates
* code like this:
*
* ``` js
* _cache[1] || (
* setBlockTracking(-1),
* _cache[1] = createVNode(...),
* setBlockTracking(1),
* _cache[1]
* )
* ```
*
* @private
*/
export function setBlockTracking(value: number) {
isBlockTreeEnabled += value
}
function setupBlock(vnode: VNode) {
// save current block children on the block vnode
vnode.dynamicChildren =
isBlockTreeEnabled > 0 ? currentBlock || (EMPTY_ARR as any) : null
// close block
closeBlock()
// a block is always going to be patched, so track it as a child of its
// parent block
if (isBlockTreeEnabled > 0 && currentBlock) {
currentBlock.push(vnode)
}
return vnode
}
/**
* @private
*/
export function createElementBlock(
type: string | typeof Fragment,
props?: Record<string, any> | null,
children?: any,
patchFlag?: number,
dynamicProps?: string[],
shapeFlag?: number
) {
return setupBlock(
createBaseVNode(
type,
props,
children,
patchFlag,
dynamicProps,
shapeFlag,
true /* isBlock */
)
)
}
/**
* Create a block root vnode. Takes the same exact arguments as `createVNode`.
* A block root keeps track of dynamic nodes within the block in the
* `dynamicChildren` array.
*
* @private
*/
export function createBlock(
type: VNodeTypes | ClassComponent,
props?: Record<string, any> | null,
children?: any,
patchFlag?: number,
dynamicProps?: string[]
): VNode {
return setupBlock(
createVNode(
type,
props,
children,
patchFlag,
dynamicProps,
true /* isBlock: prevent a block from tracking itself */
)
)
}
export function isVNode(value: any): value is VNode {
return value ? value.__v_isVNode === true : false
}
export function isSameVNodeType(n1: VNode, n2: VNode): boolean {
if (
__DEV__ &&
n2.shapeFlag & ShapeFlags.COMPONENT &&
hmrDirtyComponents.has(n2.type as ConcreteComponent)
) {
// HMR only: if the component has been hot-updated, force a reload.
return false
}
return n1.type === n2.type && n1.key === n2.key
}
let vnodeArgsTransformer:
| ((
args: Parameters<typeof _createVNode>,
instance: ComponentInternalInstance | null
) => Parameters<typeof _createVNode>)
| undefined
/**
* Internal API for registering an arguments transform for createVNode
* used for creating stubs in the test-utils
* It is *internal* but needs to be exposed for test-utils to pick up proper
* typings
*/
export function transformVNodeArgs(transformer?: typeof vnodeArgsTransformer) {
vnodeArgsTransformer = transformer
}
const createVNodeWithArgsTransform = (
...args: Parameters<typeof _createVNode>
): VNode => {
return _createVNode(
...(vnodeArgsTransformer
? vnodeArgsTransformer(args, currentRenderingInstance)
: args)
)
}
export const InternalObjectKey = `__vInternal`
const normalizeKey = ({ key }: VNodeProps): VNode['key'] =>
key != null ? key : null
const normalizeRef = ({
ref,
ref_key,
ref_for
}: VNodeProps): VNodeNormalizedRefAtom | null => {
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,
props: (Data & VNodeProps) | null = null,
children: unknown = null,
patchFlag = 0,
dynamicProps: string[] | null = null,
shapeFlag = type === Fragment ? 0 : ShapeFlags.ELEMENT,
isBlockNode = false,
needFullChildrenNormalization = false
) {
const vnode = {
__v_isVNode: true,
__v_skip: true,
type,
props,
key: props && normalizeKey(props),
ref: props && normalizeRef(props),
scopeId: currentScopeId,
slotScopeIds: null,
children,
component: null,
suspense: null,
ssContent: null,
ssFallback: null,
dirs: null,
transition: null,
el: null,
anchor: null,
target: null,
targetAnchor: null,
staticCount: 0,
shapeFlag,
patchFlag,
dynamicProps,
dynamicChildren: null,
appContext: null
} as VNode
if (needFullChildrenNormalization) {
normalizeChildren(vnode, children)
// normalize suspense children
if (__FEATURE_SUSPENSE__ && shapeFlag & ShapeFlags.SUSPENSE) {
;(type as typeof SuspenseImpl).normalize(vnode)
}
} else if (children) {
// compiled element vnode - if children is passed, only possible types are
// string or Array.
vnode.shapeFlag |= isString(children)
? ShapeFlags.TEXT_CHILDREN
: ShapeFlags.ARRAY_CHILDREN
}
// validate key
if (__DEV__ && vnode.key !== vnode.key) {
warn(`VNode created with invalid key (NaN). VNode type:`, vnode.type)
}
// track vnode for block tree
if (
isBlockTreeEnabled > 0 &&
// avoid a block node from tracking itself
!isBlockNode &&
// has current parent block
currentBlock &&
// presence of a patch flag indicates this node needs patching on updates.
// component nodes also should always be patched, because even if the
// component doesn't need to update, it needs to persist the instance on to
// the next vnode so that it can be properly unmounted later.
(vnode.patchFlag > 0 || shapeFlag & ShapeFlags.COMPONENT) &&
// the EVENTS flag is only for hydration and if it is the only flag, the
// vnode should not be considered dynamic due to handler caching.
vnode.patchFlag !== PatchFlags.HYDRATE_EVENTS
) {
currentBlock.push(vnode)
}
if (__COMPAT__) {
convertLegacyVModelProps(vnode)
defineLegacyVNodeProperties(vnode)
}
return vnode
}
export { createBaseVNode as createElementVNode }
export const createVNode = (
__DEV__ ? createVNodeWithArgsTransform : _createVNode
) as typeof _createVNode
function _createVNode(
type: VNodeTypes | ClassComponent | typeof NULL_DYNAMIC_COMPONENT,
props: (Data & VNodeProps) | null = null,
children: unknown = null,
patchFlag: number = 0,
dynamicProps: string[] | null = null,
isBlockNode = false
): VNode {
if (!type || type === NULL_DYNAMIC_COMPONENT) {
if (__DEV__ && !type) {
warn(`Invalid vnode type when creating vnode: ${type}.`)
}
type = Comment
}
if (isVNode(type)) {
// createVNode receiving an existing vnode. This happens in cases like
// <component :is="vnode"/>
// #2078 make sure to merge refs during the clone instead of overwriting it
const cloned = cloneVNode(type, props, true /* mergeRef: true */)
if (children) {
normalizeChildren(cloned, children)
}
return cloned
}
// class component normalization.
if (isClassComponent(type)) {
type = type.__vccOpts
}
// 2.x async/functional component compat
if (__COMPAT__) {
type = convertLegacyComponent(type, currentRenderingInstance)
}
// class & style normalization.
if (props) {
// for reactive or proxy objects, we need to clone it to enable mutation.
props = guardReactiveProps(props)!
let { class: klass, style } = props
if (klass && !isString(klass)) {
props.class = normalizeClass(klass)
}
if (isObject(style)) {
// reactive state objects need to be cloned since they are likely to be
// mutated
Iif (isProxy(style) && !isArray(style)) {
style = extend({}, style)
}
props.style = normalizeStyle(style)
}
}
// encode the vnode type information into a bitmap
const shapeFlag = isString(type)
? ShapeFlags.ELEMENT
: __FEATURE_SUSPENSE__ && isSuspense(type)
? ShapeFlags.SUSPENSE
: isTeleport(type)
? ShapeFlags.TELEPORT
: isObject(type)
? ShapeFlags.STATEFUL_COMPONENT
: isFunction(type)
? ShapeFlags.FUNCTIONAL_COMPONENT
: 0
Iif (__DEV__ && shapeFlag & ShapeFlags.STATEFUL_COMPONENT && isProxy(type)) {
type = toRaw(type)
warn(
`Vue received a Component which was made a reactive object. This can ` +
`lead to unnecessary performance overhead, and should be avoided by ` +
`marking the component with \`markRaw\` or using \`shallowRef\` ` +
`instead of \`ref\`.`,
`\nComponent that was made reactive: `,
type
)
}
return createBaseVNode(
type,
props,
children,
patchFlag,
dynamicProps,
shapeFlag,
isBlockNode,
true
)
}
export function guardReactiveProps(props: (Data & VNodeProps) | null) {
Iif (!props) return null
return isProxy(props) || InternalObjectKey in props
? extend({}, props)
: props
}
export function cloneVNode<T, U>(
vnode: VNode<T, U>,
extraProps?: (Data & VNodeProps) | null,
mergeRef = false
): VNode<T, U> {
// This is intentionally NOT using spread or extend to avoid the runtime
// key enumeration cost.
const { props, ref, patchFlag, children } = vnode
const mergedProps = extraProps ? mergeProps(props || {}, extraProps) : props
const cloned: VNode = {
__v_isVNode: true,
__v_skip: true,
type: vnode.type,
props: mergedProps,
key: mergedProps && normalizeKey(mergedProps),
ref:
extraProps && extraProps.ref
? // #2078 in the case of <component :is="vnode" ref="extra"/>
// if the vnode itself already has a ref, cloneVNode will need to merge
// the refs so the single vnode can be set on multiple refs
mergeRef && ref
? isArray(ref)
? ref.concat(normalizeRef(extraProps)!)
: [ref, normalizeRef(extraProps)!]
: normalizeRef(extraProps)
: ref,
scopeId: vnode.scopeId,
slotScopeIds: vnode.slotScopeIds,
children:
__DEV__ && patchFlag === PatchFlags.HOISTED && isArray(children)
? (children as VNode[]).map(deepCloneVNode)
: children,
target: vnode.target,
targetAnchor: vnode.targetAnchor,
staticCount: vnode.staticCount,
shapeFlag: vnode.shapeFlag,
// if the vnode is cloned with extra props, we can no longer assume its
// existing patch flag to be reliable and need to add the FULL_PROPS flag.
// note: preserve flag for fragments since they use the flag for children
// fast paths only.
patchFlag:
extraProps && vnode.type !== Fragment
? patchFlag === -1 // hoisted node
? PatchFlags.FULL_PROPS
: patchFlag | PatchFlags.FULL_PROPS
: patchFlag,
dynamicProps: vnode.dynamicProps,
dynamicChildren: vnode.dynamicChildren,
appContext: vnode.appContext,
dirs: vnode.dirs,
transition: vnode.transition,
// These should technically only be non-null on mounted VNodes. However,
// they *should* be copied for kept-alive vnodes. So we just always copy
// them since them being non-null during a mount doesn't affect the logic as
// they will simply be overwritten.
component: vnode.component,
suspense: vnode.suspense,
ssContent: vnode.ssContent && cloneVNode(vnode.ssContent),
ssFallback: vnode.ssFallback && cloneVNode(vnode.ssFallback),
el: vnode.el,
anchor: vnode.anchor
}
if (__COMPAT__) {
defineLegacyVNodeProperties(cloned)
}
return cloned as any
}
/**
* Dev only, for HMR of hoisted vnodes reused in v-for
* https://github.com/vitejs/vite/issues/2022
*/
function deepCloneVNode(vnode: VNode): VNode {
const cloned = cloneVNode(vnode)
Iif (isArray(vnode.children)) {
cloned.children = (vnode.children as VNode[]).map(deepCloneVNode)
}
return cloned
}
/**
* @private
*/
export function createTextVNode(text: string = ' ', flag: number = 0): VNode {
return createVNode(Text, null, text, flag)
}
/**
* @private
*/
export function createStaticVNode(
content: string,
numberOfNodes: number
): VNode {
// A static vnode can contain multiple stringified elements, and the number
// of elements is necessary for hydration.
const vnode = createVNode(Static, null, content)
vnode.staticCount = numberOfNodes
return vnode
}
/**
* @private
*/
export function createCommentVNode(
text: string = '',
// when used as the v-else branch, the comment node must be created as a
// block to ensure correct updates.
asBlock: boolean = false
): VNode {
return asBlock
? (openBlock(), createBlock(Comment, null, text))
: createVNode(Comment, null, text)
}
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 (typeof child === 'object') {
// 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 {
return child.el === null || child.memo ? child : cloneVNode(child)
}
export function normalizeChildren(vnode: VNode, children: unknown) {
let type = 0
const { shapeFlag } = vnode
if (children == null) {
children = null
} else if (isArray(children)) {
type = ShapeFlags.ARRAY_CHILDREN
} else if (typeof children === 'object') {
if (shapeFlag & (ShapeFlags.ELEMENT | ShapeFlags.TELEPORT)) {
// Normalize slot to plain children for plain element and Teleport
const slot = (children as any).default
if (slot) {
// _c marker is added by withCtx() indicating this is a compiled slot
slot._c && (slot._d = false)
normalizeChildren(vnode, slot())
slot._c && (slot._d = true)
}
return
} else {
type = ShapeFlags.SLOTS_CHILDREN
const slotFlag = (children as RawSlots)._
if (!slotFlag && !(InternalObjectKey in children!)) {
// if slots are not normalized, attach context instance
// (compiled / normalized slots already have context)
;(children as RawSlots)._ctx = currentRenderingInstance
} else if (slotFlag === SlotFlags.FORWARDED && currentRenderingInstance) {
// a child component receives forwarded slots from the parent.
// its slot type is determined by its parent's slot type.
if (
(currentRenderingInstance.slots as RawSlots)._ === SlotFlags.STABLE
) {
;(children as RawSlots)._ = SlotFlags.STABLE
} else {
;(children as RawSlots)._ = SlotFlags.DYNAMIC
vnode.patchFlag |= PatchFlags.DYNAMIC_SLOTS
}
}
}
} else if (isFunction(children)) {
children = { default: children, _ctx: currentRenderingInstance }
type = ShapeFlags.SLOTS_CHILDREN
} else {
children = String(children)
// force teleport children to array so it can be moved around
if (shapeFlag & ShapeFlags.TELEPORT) {
type = ShapeFlags.ARRAY_CHILDREN
children = [createTextVNode(children as string)]
} else {
type = ShapeFlags.TEXT_CHILDREN
}
}
vnode.children = children as VNodeNormalizedChildren
vnode.shapeFlag |= type
}
export function mergeProps(...args: (Data & VNodeProps)[]) {
const ret: Data = {}
for (let i = 0; i < args.length; i++) {
const toMerge = args[i]
for (const key in toMerge) {
if (key === 'class') {
if (ret.class !== toMerge.class) {
ret.class = normalizeClass([ret.class, toMerge.class])
}
} else if (key === 'style') {
ret.style = normalizeStyle([ret.style, toMerge.style])
} else if (isOn(key)) {
const existing = ret[key]
const incoming = toMerge[key]
if (
incoming &&
existing !== incoming &&
!(isArray(existing) && existing.includes(incoming))
) {
ret[key] = existing
? [].concat(existing as any, incoming as any)
: incoming
}
} else if (key !== '') {
ret[key] = toMerge[key]
}
}
}
return ret
}
export function invokeVNodeHook(
hook: VNodeHook,
instance: ComponentInternalInstance | null,
vnode: VNode,
prevVNode: VNode | null = null
) {
callWithAsyncErrorHandling(hook, instance, ErrorCodes.VNODE_HOOK, [
vnode,
prevVNode
])
}
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