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fix(runtime-core): when Transition reports a warning about 'can only be used on a single element or component', it ignores the comments node. (fix #5675) #5708

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fix(runtime-core): when Transition reports a warning about 'can only be used on a single element or component', it ignores the comments node. (fix #5675) #5708

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fix(runtime-core): when Transition reports a warning about 'can only …
baiwusanyu-c Apr 13, 2022
72db792
Merge remote-tracking branch 'origin/main' into fix/transition
baiwusanyu-c Apr 13, 2022
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10 changes: 7 additions & 3 deletions packages/runtime-core/src/components/BaseTransition.ts
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Expand Up @@ -20,6 +20,7 @@ import { ShapeFlags, PatchFlags } from '@vue/shared'
import { onBeforeUnmount, onMounted } from '../apiLifecycle'
import { RendererElement } from '../renderer'


export interface BaseTransitionProps<HostElement = RendererElement> {
mode?: 'in-out' | 'out-in' | 'default'
appear?: boolean
Expand Down Expand Up @@ -140,16 +141,19 @@ const BaseTransitionImpl: ComponentOptions = {
const state = useTransitionState()

let prevTransitionKey: any

const filterCommentChild = (children:Array<VNode>) =>{
return children.filter((child:VNode)=>{
return child.type !== Comment
})
}
return () => {
const children =
slots.default && getTransitionRawChildren(slots.default(), true)
if (!children || !children.length) {
return
}

// warn multiple elements
if (__DEV__ && children.length > 1) {
if (__DEV__ && filterCommentChild(children).length > 1) {
warn(
'<transition> can only be used on a single element or component. Use ' +
'<transition-group> for lists.'
Expand Down