Keep other static class members, such as defaultProps (#36)

* Add test for defaultProps

* Check if the name == "propTypes", not != " propTypes"

* More ways of getting the class member name (hacky)

* Check if we're an identifier; if we are we can just always use name.escapedText

* Use ts.isIdentifier helper function instead of direct comparison on .kind

src/helpers/index.ts

@@ -97,7 +97,9 @@ export function hasStaticModifier(classMember: ts.ClassElement) {
  */
 export function isPropTypesMember(classMember: ts.ClassElement, sourceFile: ts.SourceFile) {
     try {
-        return classMember.name !== undefined && classMember.name.getFullText(sourceFile) !== 'propTypes';
+        const name =
+            classMember.name !== undefined && ts.isIdentifier(classMember.name) ? classMember.name.escapedText : null;
+        return name === 'propTypes';
     } catch (e) {
         return false;
     }

test/react-remove-static-prop-types-member-transform/other-static-members/input.tsx

@@ -0,0 +1,8 @@
+class SomeComponent extends React.Component<{
+    foo: number;
+}, {
+    bar: string;
+}> {
+    static propTypes = { foo: React.PropTypes.string };
+    static defaultProps = { foo: 'bar' };
+}

test/react-remove-static-prop-types-member-transform/other-static-members/output.tsx

@@ -0,0 +1,10 @@
+class SomeComponent extends React.Component<
+    {
+        foo: number,
+    },
+    {
+        bar: string,
+    },
+> {
+    static defaultProps = { foo: 'bar' };
+}