Adding @extends React.Component support to isReactComponentClass (#269)

* [component-verification] Adding additional method to verify component is a React Component

* [test] adding unit test

* [tiny] Initializing variable to satisfy TravisCI

* [fixes] incorporating feedback

* [fix] fixing a few more nits

* [refactor] cleaning up some checks

Author: Dustin Savery

src/utils/__tests__/isReactComponentClass-test.js

@@ -52,6 +52,21 @@ describe('isReactComponentClass', () => {
     });
   });
 
+  describe('JSDoc @extends React.Component', () => {
+    it('accepts class declarations declaring `@extends React.Component` in JSDoc', () => {
+      var def = parse(`
+        var React = require('react');
+        /**
+         * @class Foo
+         * @extends React.Component 
+         */
+        class Foo extends Bar {}
+      `).get('body', 1);
+
+      expect(isReactComponentClass(def)).toBe(true);
+    });
+  });
+
   describe('React.Component inheritance', () => {
     it('accepts class declarations extending React.Component', () => {
       var def = parse(`

src/utils/isReactComponentClass.js

@@ -44,6 +44,21 @@ export default function isReactComponentClass(
     return true;
   }
 
+  // check for @extends React.Component in docblock
+  if (path.parentPath && path.parentPath.value) {
+    var classDeclaration = Array.isArray(path.parentPath.value)
+      ? path.parentPath.value.find(function(declaration) { return declaration.type === 'ClassDeclaration' })
+      : path.parentPath.value;
+    
+    if (classDeclaration &&
+      classDeclaration.leadingComments &&
+      classDeclaration.leadingComments.some(function (comment) {
+        return /@extends\s+React\.Component/.test(comment.value);
+      })) {
+      return true;
+    }
+  }
+
   // extends ReactComponent?
   if (!node.superClass) {
     return false;