Check for undefined before accessing node.type_annotations

Author: tylerlaprade

lib/rules/sort-prop-types.js

@@ -230,7 +230,7 @@ module.exports = {
     }
 
     function handleFunctionComponent(node) {
-      const firstArg = node.params[0].typeAnnotation && node.params[0].typeAnnotation.typeAnnotation;
+      const firstArg = node.params && node.params.length > 0 && node.params[0].typeAnnotation && node.params[0].typeAnnotation.typeAnnotation;
       if (firstArg && firstArg.type === 'TSTypeReference') {
         const propType = typeAnnotations.get(firstArg.typeName.name)
           && typeAnnotations.get(firstArg.typeName.name)[0];