Extract argument into a variable

Author: alexzherdev

lib/rules/sort-prop-types.js

@@ -257,10 +257,11 @@ module.exports = {
           return;
         }
 
-        if (node.arguments[0].properties) {
-          checkSorted(node.arguments[0].properties);
-        } else if (node.arguments[0].type === 'Identifier') {
-          const variable = variableUtil.findVariableByName(context, node.arguments[0].name);
+        const firstArg = node.arguments[0];
+        if (firstArg.properties) {
+          checkSorted(firstArg.properties);
+        } else if (firstArg.type === 'Identifier') {
+          const variable = variableUtil.findVariableByName(context, firstArg.name);
           if (variable && variable.properties) {
             checkSorted(variable.properties);
           }