refactor: use getStringLiteralValue

Author: KazariEX

lib/rules/no-unused-refs.js

@@ -242,13 +242,9 @@ module.exports = {
             if (!arg0) {
               return
             }
-            if (arg0.type === 'Literal') {
-              usedRefs.add(arg0.value)
-            } else if (
-              arg0.type === 'TemplateLiteral' &&
-              arg0.quasis.length === 1
-            ) {
-              usedRefs.add(arg0.quasis[0].value.cooked)
+            const name = utils.getStringLiteralValue(arg0)
+            if (name !== null) {
+              usedRefs.add(name)
             }
           }
         }