Tests and explaining the case that is currently not supported.

tests/lib/rules/no-typos.js

@@ -240,6 +240,15 @@ ruleTester.run('no-typos', rule, {
       '}'
     ].join('\n'),
     parserOptions: parserOptions
+  }, {
+    // PropTypes declared on a component that is detected through JSDoc comments and is
+    // declared AFTER the PropTypes assignment does not work.
+    code: `
+      MyComponent.PROPTYPES = {}
+      /** @extends React.Component */
+      class MyComponent extends BaseComponent {}
+    `,
+    parserOptions: parserOptions
   }, {
     // https://github.com/yannickcr/eslint-plugin-react/issues/1353
     code: `
@@ -435,6 +444,21 @@ ruleTester.run('no-typos', rule, {
     ].join('\n'),
     parserOptions: parserOptions,
     errors: [{message: ERROR_MESSAGE}]
+  }, {
+    code: [
+      'Component.defaultprops = {}',
+      'class Component extends React.Component {}'
+    ].join('\n'),
+    parserOptions: parserOptions,
+    errors: [{message: ERROR_MESSAGE}]
+  }, {
+    code: `
+      /** @extends React.Component */
+      class MyComponent extends BaseComponent {}
+      MyComponent.PROPTYPES = {}
+    `,
+    parserOptions: parserOptions,
+    errors: [{message: ERROR_MESSAGE}]
   }, {
     code: [
       'class Hello extends React.Component {',