[system] Fix composeClasses v6 behavior change

oliviertassinari · oliviertassinari · commit 85f22392cf9d · 2024-08-31T00:07:18.000+02:00
diff --git a/packages/mui-utils/src/composeClasses/composeClasses.ts b/packages/mui-utils/src/composeClasses/composeClasses.ts
@@ -17,10 +17,10 @@ export default function composeClasses<ClassKey extends string>(
     for (let i = 0; i < slot.length; i += 1) {
       const value = slot[i];
       if (value) {
-        buffer += getUtilityClass(value) + ' ';
+        buffer += (buffer === '' ? '' : ' ') + getUtilityClass(value);
 
         if (classes && classes[value]) {
-          buffer += classes[value] + ' ';
+          buffer += ' ' + classes[value];
         }
       }
     }

Original file line number	Diff line number	Diff line change
`@@ -17,10 +17,10 @@ export default function composeClasses<ClassKey extends string>(`
`17`	`17`	`for (let i = 0; i < slot.length; i += 1) {`
`18`	`18`	`const value = slot[i];`
`19`	`19`	`if (value) {`
`20`		`- buffer += getUtilityClass(value) + ' ';`
	`20`	`+ buffer += (buffer === '' ? '' : ' ') + getUtilityClass(value);`
`21`	`21`
`22`	`22`	`if (classes && classes[value]) {`
`23`		`- buffer += classes[value] + ' ';`
	`23`	`+ buffer += ' ' + classes[value];`
`24`	`24`	`}`
`25`	`25`	`}`
`26`	`26`	`}`