message: Better type checking
diff: @@ -25,6 +25,7 @@ import sdk from '../../../index';
  import type {Completion} from '../../../autocomplete/Autocompleter';
  import Promise from 'bluebird';
  import UserSettingsStore from '../../../UserSettingsStore';
  +import { Room } from 'matrix-js-sdk';
  import Autocompleter from '../../../autocomplete/Autocompleter';
  @@ -301,5 +302,5 @@ Autocomplete.propTypes = {
  onConfirm: PropTypes.func.isRequired,
  // The room in which we're autocompleting
  - room: PropTypes.object,
  + room: PropTypes.instanceOf(Room),
  };
  