add proptypes to login form

client/modules/User/components/LoginForm.js

@@ -1,10 +1,9 @@
-import React from 'react';
+import React, { PropTypes } from 'react';
 
-class LoginForm extends React.Component {
+function LoginForm(props) {
-  render() {
+  const { fields: { email, password }, handleSubmit } = props;
-    const { fields: { email, password }, handleSubmit } = this.props;
   return (
-      <form className="login-form" onSubmit={handleSubmit(this.props.loginUser.bind(this))}>
+    <form className="login-form" onSubmit={handleSubmit(props.loginUser.bind(this))}>
       <p className="login-form__field">
         <label className="login-form__email-label" htmlFor="email">Email:</label>
         <input
@@ -28,7 +27,15 @@ class LoginForm extends React.Component {
       <input type="submit" value="Login" />
     </form>
   );
-  }
 }
 
+LoginForm.propTypes = {
+  fields: PropTypes.shape({
+    username: PropTypes.string.isRequired,
+    password: PropTypes.string.isRequired
+  }).isRequired,
+  handleSubmit: PropTypes.func.isRequired,
+  loginUser: PropTypes.func.isRequired
+};
+
 export default LoginForm;