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Small lints #3244

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merged 5 commits into from
Aug 25, 2024
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Small lints #3244

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4267884
perf: small lints
romgrk Aug 22, 2024
1f73e47
revert
romgrk Aug 22, 2024
7833156
lint
romgrk Aug 22, 2024
c61f8b7
chore: add changeset
romgrk Aug 23, 2024
1fa3297
Update .changeset/curly-jars-punch.md
Andarist Aug 25, 2024
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6 changes: 6 additions & 0 deletions .changeset/curly-jars-punch.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
---
'@emotion/serialize': patch
'@emotion/utils': patch
---

Minor performance improvement
2 changes: 1 addition & 1 deletion packages/serialize/src/index.ts
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Expand Up @@ -365,7 +365,7 @@ function createStringFromObject(
return string
}

let labelPattern = /label:\s*([^\s;\n{]+)\s*(;|$)/g
let labelPattern = /label:\s*([^\s;{]+)\s*(;|$)/g
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\s contains \n. See node -p "'\\n'.match(/\\s/)"


let sourceMapPattern: RegExp | undefined
if (isDevelopment) {
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2 changes: 1 addition & 1 deletion packages/utils/src/index.ts
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Expand Up @@ -11,7 +11,7 @@ export function getRegisteredStyles(
classNames.split(' ').forEach(className => {
if (registered[className] !== undefined) {
registeredStyles.push(`${registered[className]};`)
} else {
} else if (className) {
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classNames could have multiple sequential spaces, in which case .split(' ') would produce empty strings.

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a test case probably could be written for this, does it create a problem though? a rawClassName has already been allocated, can't this use some kind of string ropes or something to stay optimized?

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@romgrk romgrk Aug 22, 2024 •
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Yeah someone might have inserted additional whitespaces in their classnames.

So sure engines will usually use a concatenated string like I describe here to optimize concat operations, but adding a single ' ' is likely too small to be worth it, engines are most likely just allocating a new string for those bytes.

I wrote a benchmark with only this difference, it does seem to have a positive impact: (I inserted a bunch of spaces to highlight the impact more clearly)

image

rawClassName += `${className} `
}
})
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