Implemented strict mode for the project (broken tests, hundreds of @ts-ignore and new errors are included) [skip ci]

packages/app/components/auth/finish/Finish.tsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { MouseEventHandler } from 'react';
 import { connect } from 'react-redux';
 import { FormattedMessage as Message } from 'react-intl';
 import { Helmet } from 'react-helmet-async';
@@ -13,7 +13,7 @@ interface Props {
   appName: string;
   code?: string;
   state: string;
-  displayCode?: string;
+  displayCode?: boolean;
   success?: boolean;
 }
 
@@ -84,7 +84,7 @@ class Finish extends React.Component<Props> {
     );
   }
 
-  onCopyClick = event => {
+  onCopyClick: MouseEventHandler = event => {
     event.preventDefault();
 
     const { code } = this.props;