Merge pull request #17444 from burhanuday/fix/css-unused-identifiers

fix: unused identifiers should retain names when using css modules

Author: TheLarkInn

lib/dependencies/CssLocalIdentifierDependency.js

@@ -109,6 +109,9 @@ CssLocalIdentifierDependency.Template = class CssLocalIdentifierDependencyTempla
 		const used = moduleGraph
 			.getExportInfo(module, dep.name)
 			.getUsedName(dep.name, runtime);
+
+		if (!used) return;
+
 		const moduleId = chunkGraph.getModuleId(module);
 		const identifier =
 			dep.prefix +