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5 changes: 5 additions & 0 deletions packages/runtime-dom/src/helpers/useCssVars.ts
Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ import {
type VNode,
getCurrentInstance,
onBeforeMount,
onBeforeUpdate,
onMounted,
onUnmounted,
warn,
Expand Down Expand Up @@ -47,6 +48,10 @@ export function useCssVars(getter: (ctx: any) => Record<string, string>) {
watchPostEffect(setVars)
})

onBeforeUpdate(() => {
watchPostEffect(setVars)
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Should just call setVars and not create another watcher on each update.

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@linzhe141 linzhe141 Aug 9, 2024

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When I just call setVars before update, the vnode is still a v-if comment, and it doesn't make sense to set custom properties for this comment.

image

But when I combine it with watchPostEffect, the vnode is correct.

image

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or use queuePostFlushCb instead?

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thanks

})

onMounted(() => {
const ob = new MutationObserver(setVars)
ob.observe(instance.subTree.el!.parentNode, { childList: true })
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