feat(teleport): support deferred Teleport (#11387)

close #2015
close #11386

packages/runtime-core/__tests__/rendererOptimizedMode.spec.ts

@@ -618,7 +618,7 @@ describe('renderer: optimized mode', () => {
   })
 
   //#3623
-  test('nested teleport unmount need exit the optimization mode', () => {
+  test('nested teleport unmount need exit the optimization mode', async () => {
     const target = nodeOps.createElement('div')
     const root = nodeOps.createElement('div')
 
@@ -647,6 +647,7 @@ describe('renderer: optimized mode', () => {
       ])),
       root,
     )
+    await nextTick()
     expect(inner(target)).toMatchInlineSnapshot(
       `"<div><!--teleport start--><!--teleport end--></div><div>foo</div>"`,
     )

packages/runtime-core/src/components/Teleport.ts

@@ -7,6 +7,7 @@ import {
   type RendererInternals,
   type RendererNode,
   type RendererOptions,
+  queuePostRenderEffect,
   traverseStaticChildren,
 } from '../renderer'
 import type { VNode, VNodeArrayChildren, VNodeProps } from '../vnode'
@@ -19,6 +20,7 @@ export type TeleportVNode = VNode<RendererNode, RendererElement, TeleportProps>
 export interface TeleportProps {
   to: string | RendererElement | null | undefined
   disabled?: boolean
+  defer?: boolean
 }
 
 export const TeleportEndKey = Symbol('_vte')
@@ -28,6 +30,9 @@ export const isTeleport = (type: any): boolean => type.__isTeleport
 const isTeleportDisabled = (props: VNode['props']): boolean =>
   props && (props.disabled || props.disabled === '')
 
+const isTeleportDeferred = (props: VNode['props']): boolean =>
+  props && (props.defer || props.defer === '')
+
 const isTargetSVG = (target: RendererElement): boolean =>
   typeof SVGElement !== 'undefined' && target instanceof SVGElement
 
@@ -107,7 +112,6 @@ export const TeleportImpl = {
       const mainAnchor = (n2.anchor = __DEV__
         ? createComment('teleport end')
         : createText(''))
-      const target = (n2.target = resolveTarget(n2.props, querySelector))
       const targetStart = (n2.targetStart = createText(''))
       const targetAnchor = (n2.targetAnchor = createText(''))
       insert(placeholder, container, anchor)
@@ -115,18 +119,6 @@ export const TeleportImpl = {
       // attach a special property so we can skip teleported content in
       // renderer's nextSibling search
       targetStart[TeleportEndKey] = targetAnchor
-      if (target) {
-        insert(targetStart, target)
-        insert(targetAnchor, target)
-        // #2652 we could be teleporting from a non-SVG tree into an SVG tree
-        if (namespace === 'svg' || isTargetSVG(target)) {
-          namespace = 'svg'
-        } else if (namespace === 'mathml' || isTargetMathML(target)) {
-          namespace = 'mathml'
-        }
-      } else if (__DEV__ && !disabled) {
-        warn('Invalid Teleport target on mount:', target, `(${typeof target})`)
-      }
 
       const mount = (container: RendererElement, anchor: RendererNode) => {
         // Teleport *always* has Array children. This is enforced in both the
@@ -145,10 +137,39 @@ export const TeleportImpl = {
         }
       }
 
+      const mountToTarget = () => {
+        const target = (n2.target = resolveTarget(n2.props, querySelector))
+        if (target) {
+          insert(targetStart, target)
+          insert(targetAnchor, target)
+          // #2652 we could be teleporting from a non-SVG tree into an SVG tree
+          if (namespace !== 'svg' && isTargetSVG(target)) {
+            namespace = 'svg'
+          } else if (namespace !== 'mathml' && isTargetMathML(target)) {
+            namespace = 'mathml'
+          }
+          if (!disabled) {
+            mount(target, targetAnchor)
+            updateCssVars(n2)
+          }
+        } else if (__DEV__ && !disabled) {
+          warn(
+            'Invalid Teleport target on mount:',
+            target,
+            `(${typeof target})`,
+          )
+        }
+      }
+
       if (disabled) {
         mount(container, mainAnchor)
-      } else if (target) {
-        mount(target, targetAnchor)
+        updateCssVars(n2)
+      }
+
+      if (isTeleportDeferred(n2.props)) {
+        queuePostRenderEffect(mountToTarget, parentSuspense)
+      } else {
+        mountToTarget()
       }
     } else {
       // update content
@@ -249,9 +270,8 @@ export const TeleportImpl = {
           )
         }
       }
+      updateCssVars(n2)
     }
-
-    updateCssVars(n2)
   },
 
   remove(
@@ -441,7 +461,7 @@ function updateCssVars(vnode: VNode) {
   // code path here can assume browser environment.
   const ctx = vnode.ctx
   if (ctx && ctx.ut) {
-    let node = (vnode.children as VNode[])[0].el!
+    let node = vnode.targetStart
     while (node && node !== vnode.targetAnchor) {
       if (node.nodeType === 1) node.setAttribute('data-v-owner', ctx.uid)
       node = node.nextSibling

packages/runtime-core/src/scheduler.ts

@@ -127,7 +127,9 @@ export function invalidateJob(job: SchedulerJob) {
 
 export function queuePostFlushCb(cb: SchedulerJobs) {
   if (!isArray(cb)) {
-    if (!(cb.flags! & SchedulerJobFlags.QUEUED)) {
+    if (activePostFlushCbs && cb.id === -1) {
+      activePostFlushCbs.splice(postFlushIndex + 1, 0, cb)
+    } else if (!(cb.flags! & SchedulerJobFlags.QUEUED)) {
       pendingPostFlushCbs.push(cb)
       if (!(cb.flags! & SchedulerJobFlags.ALLOW_RECURSE)) {
         cb.flags! |= SchedulerJobFlags.QUEUED