Fix flow errors

frontend/components/CenteredContent/CenteredContent.js

@@ -5,6 +5,7 @@ import styles from './CenteredContent.scss';
 type Props = {
   children: any,
   style: Object,
+  maxWidth: string,
 };
 
 const CenteredContent = (props: Props) => {

frontend/components/Document/components/DocumentHtml/DocumentHtml.test.js

@@ -11,10 +11,6 @@ const testHtml = `
 `;
 
 test('renders', () => {
-  const wrapper = shallow(
-    <DocumentHtml
-      html={ testHtml }
-    />
-  );
+  const wrapper = shallow(<DocumentHtml html={testHtml} />);
   expect(wrapper.find('.document').length).toBe(1);
 });

frontend/components/SlackAuthLink/SlackAuthLink.js

@@ -1,7 +1,7 @@
 // @flow
 import React from 'react';
 import { observer, inject } from 'mobx-react';
-import type { User } from 'types';
+import UserStore from 'stores/UserStore';
 
 @inject('user')
 @observer
@@ -9,7 +9,7 @@ class SlackAuthLink extends React.Component {
   props: {
     children: any,
     scopes: Array<string>,
-    user: User,
+    user: UserStore,
     redirectUri: string,
   };
 
@@ -25,8 +25,10 @@ class SlackAuthLink extends React.Component {
   slackUrl = () => {
     const baseUrl = 'https://slack.com/oauth/authorize';
     const params = {
+      // $FlowIssue global variable
       client_id: SLACK_KEY,
       scope: this.props.scopes.join(' '),
+      // $FlowIssue global variable
       redirect_uri: this.props.redirectUri || SLACK_REDIRECT_URI,
       state: this.props.user.getOauthState(),
     };