Upgrade to Flow 0.71

app/components/Toasts/Toasts.js

@@ -1,12 +1,12 @@
 // @flow
-import React, { Component } from 'react';
+import * as React from 'react';
 import { inject, observer } from 'mobx-react';
 import styled from 'styled-components';
 import { layout } from 'shared/styles/constants';
 import Toast from './components/Toast';
 
 @observer
-class Toasts extends Component {
+class Toasts extends React.Component<*> {
   handleClose = index => {
     this.props.errors.remove(index);
   };

app/components/Toasts/components/Toast.js

@@ -1,5 +1,5 @@
 // @flow
-import React, { Component } from 'react';
+import * as React from 'react';
 import styled from 'styled-components';
 import { darken } from 'polished';
 import { color } from 'shared/styles/constants';
@@ -12,9 +12,8 @@ type Props = {
   type: 'warning' | 'error' | 'info',
 };
 
-class Toast extends Component {
-  timeout: number;
-  props: Props;
+class Toast extends React.Component<Props> {
+  timeout: TimeoutID;
 
   static defaultProps = {
     closeAfterMs: 3000,