Use key.value for string literal

Author: metreniuk

lib/rules/sort-prop-types.js

@@ -57,9 +57,10 @@ module.exports = {
     const propWrapperFunctions = new Set(context.settings.propWrapperFunctions || []);
 
     function getKey(node) {
-      const key = sourceCode.getText(node.key || node.argument);
-      const hasLeadingQuote = /['"]/.test(key[0]);
-      return hasLeadingQuote ? key.substring(1, key.length - 1) : key;
+      if (node.key && node.key.value) {
+        return node.key.value;
+      }
+      return sourceCode.getText(node.key || node.argument);
     }
 
     function getValueName(node) {