Review comments

Author: millar

src/components/Link/index.js

@@ -59,9 +59,9 @@ class Link extends React.PureComponent {
     static contextTypes = {router: RouterContextPropType};
     context: {router: RouterContextType};
     props: Props;
-    ref: HTMLElement | null
+    ref: ?HTMLElement
 
-    setRef = (e: HTMLElement | null) => {
+    setRef = (e: ?HTMLElement) => {
         if (e) {
             this.context.router.visibleRefProps.set(e, this._getCallbackProps());
         } else if (this.ref) {

src/components/Link/utils.js

@@ -2,11 +2,11 @@
 import React, {Children, isValidElement} from 'react';
 
 const childToString = (child: Text | boolean | {} | null): string => {
-    if (typeof child === 'undefined' || child === null || typeof child === 'boolean') {
+    if (!child || typeof child === 'boolean') {
         return '';
     }
 
-    return child.toString();
+    return child.toString().replace('[object Object]', '');
 };
 
 const hasChildren = (element: React.Children): boolean =>

src/types.js

@@ -55,6 +55,7 @@ export type LinkProps = {
     trackingContext?: ?Array<any>
 };
 
+
 export type LinkCallbackProps = {
     location: Location,
     name: ?string,