[fix] - Edit heading-has-content to check correctly for undefined.

Author: Ethan Cohen

src/rules/heading-has-content.js

@@ -42,7 +42,10 @@ module.exports = context => ({
             child.openingElement.attributes
           );
         case 'JSXExpressionContainer':
-          return child.expression.type === 'Identifier' && child.expression.name !== 'undefined';
+          if (child.expression.type === 'Identifier') {
+            return child.expression.name !== 'undefined';
+          }
+          return true;
         default:
           return false;
       }

tests/src/rules/heading-has-content.js

@@ -40,6 +40,7 @@ ruleTester.run('heading-has-content', rule, {
     { code: '<h6>123</h6>', parserOptions },
     { code: '<h1><Bar /></h1>', parserOptions },
     { code: '<h1>{foo}</h1>', parserOptions },
+    { code: '<h1>{foo.bar}</h1>', parserOptions },
   ],
   invalid: [
     { code: '<h1 />', errors: [expectedError], parserOptions },