feat: enable the use of TypeScript in this repo (#604)

* feat: enable Typescript in this repo

* refactor: rename studio-header files to .ts[x]

* chore: fix minor type warnings

* chore: add types for frontend-platform

* chore: fix type issues

* chore: update name of suppressed lint check

src/studio-header/UserMenu.tsx

@@ -0,0 +1,69 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
+import {
+  Avatar,
+} from '@openedx/paragon';
+import NavDropdownMenu from './NavDropdownMenu';
+import getUserMenuItems from './utils';
+
+const UserMenu = ({
+  username,
+  studioBaseUrl,
+  logoutUrl,
+  authenticatedUserAvatar,
+  isMobile,
+  isAdmin,
+  // injected
+  intl,
+}) => {
+  const avatar = authenticatedUserAvatar ? (
+    <img
+      className="d-block w-100 h-100"
+      src={authenticatedUserAvatar}
+      alt={username}
+      data-testid="avatar-image"
+    />
+  ) : (
+    <Avatar
+      size="sm"
+      className="mr-2"
+      alt={username}
+      data-testid="avatar-icon"
+    />
+  );
+  const title = isMobile ? avatar : <>{avatar}{username}</>;
+
+  return (
+    <NavDropdownMenu
+      buttonTitle={title}
+      id="user-dropdown-menu"
+      items={getUserMenuItems({
+        studioBaseUrl,
+        logoutUrl,
+        intl,
+        isAdmin,
+      })}
+    />
+  );
+};
+
+UserMenu.propTypes = {
+  username: PropTypes.string,
+  studioBaseUrl: PropTypes.string.isRequired,
+  logoutUrl: PropTypes.string.isRequired,
+  authenticatedUserAvatar: PropTypes.string,
+  isMobile: PropTypes.bool,
+  isAdmin: PropTypes.bool,
+  // injected
+  intl: intlShape.isRequired,
+};
+
+UserMenu.defaultProps = {
+  isMobile: false,
+  isAdmin: false,
+  authenticatedUserAvatar: null,
+  username: null,
+};
+
+export default injectIntl(UserMenu);