Minor performance improvements (#3244)

* perf: small lints * revert * lint * chore: add changeset * Update .changeset/curly-jars-punch.md --------- Co-authored-by: Mateusz Burzyński <mateuszburzynski@gmail.com>
emotion-js · Aug 25, 2024 · ad630e3 · ad630e3
1 parent 3f46884
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diff --git a/.changeset/curly-jars-punch.md b/.changeset/curly-jars-punch.md
@@ -0,0 +1,6 @@
+---
+'@emotion/serialize': patch
+'@emotion/utils': patch
+---
+
+Minor performance improvement
diff --git a/packages/serialize/src/index.ts b/packages/serialize/src/index.ts
@@ -365,7 +365,7 @@ function createStringFromObject(
   return string
 }
 
-let labelPattern = /label:\s*([^\s;\n{]+)\s*(;|$)/g
+let labelPattern = /label:\s*([^\s;{]+)\s*(;|$)/g
 
 let sourceMapPattern: RegExp | undefined
 if (isDevelopment) {

diff --git a/packages/utils/src/index.ts b/packages/utils/src/index.ts
@@ -11,7 +11,7 @@ export function getRegisteredStyles(
   classNames.split(' ').forEach(className => {
     if (registered[className] !== undefined) {
       registeredStyles.push(`${registered[className]};`)
-    } else {
+    } else if (className) {
       rawClassName += `${className} `
     }
   })