fix: address early review comments and lint

client/src/components/helpers/Link.js

@@ -1,8 +1,15 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 import { Link as GatsbyLink } from 'gatsby';
 
+const propTypes = {
+  children: PropTypes.any,
+  external: PropTypes.bool,
+  to: PropTypes.string.isRequired
+};
+
 const Link = ({ children, to, external, ...other }) => {
-  if (!external && (/^\/(?!\/)/).test(to)) {
+  if (!external && /^\/(?!\/)/.test(to)) {
     return (
       <GatsbyLink to={to} {...other}>
         {children}
@@ -16,5 +23,6 @@ const Link = ({ children, to, external, ...other }) => {
     </a>
   );
 };
+Link.propTypes = propTypes;
 
 export default Link;