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fix(useCssVars): fix the loss of CSS variables during updates #9824

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merged 5 commits into from Dec 15, 2023

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Alfred-Skyblue
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fixed #9821

During the patchStyle process, if a string type is passed, it will overwrite the entire cssText, leading to the loss of the useCssVars variable. In useCssVars, I store CSS variables in a private property of the style, which is then collectively set to cssText during the patchStyle process.

I attempted to use a MutationObserver to monitor style changes in all child elements. However, in the scenario where we also need to listen to the childList of the parentNode, I had to add another MutationObserver within the parentNode's observer to simultaneously monitor newly added child elements. This approach introduces complexity to the logic, so I opted for the current solution.

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github-actions bot commented Dec 13, 2023

Size Report

Bundles

File Size Gzip Brotli
runtime-dom.global.prod.js 87 kB (+98 B) 33.1 kB (+34 B) 29.9 kB (+48 B)
vue.global.prod.js 133 kB (+98 B) 50 kB (+58 B) 44.8 kB (+55 B)

Usages

Name Size Gzip Brotli
createApp 48.4 kB (+53 B) 19 kB (+19 B) 17.4 kB (+71 B)
createSSRApp 51.6 kB (+53 B) 20.3 kB (+22 B) 18.5 kB (+25 B)
defineCustomElement 50.7 kB (+53 B) 19.8 kB (+24 B) 18.1 kB (-6 B)
overall 61.7 kB (+53 B) 23.9 kB (+22 B) 21.8 kB (+20 B)

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codspeed-hq bot commented Dec 13, 2023

CodSpeed Performance Report

Merging #9824 will not alter performance

Comparing Alfred-Skyblue:fix/useCssVars (6f9d871) with main (a6503e3)

Summary

✅ 53 untouched benchmarks

@edison1105 edison1105 added the ready for review This PR requires more reviews label Dec 14, 2023
// #9821
let cssVarText = (style as any)[CSS_VAR_TEXT]
if (cssVarText) {
cssVarText = (next.endsWith(';') ? '' : '; ') + cssVarText
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All mainstream browsers are able to handle extra ; between properties in inline style, so we can just do ;(next as string) += ';' + cssVarText and make cssVarText a const.

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I have already made the modifications, thank you for your guidance.

@yyx990803 yyx990803 merged commit 0a387df into vuejs:main Dec 15, 2023
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@Alfred-Skyblue Alfred-Skyblue deleted the fix/useCssVars branch December 15, 2023 01:57
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custom properties from CSS v-bind are not re-added when inline style is patched
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