Extract notification timeout to a constant

modules/UI/util/MessageHandler.js

 import jitsiLocalStorage from '../../util/JitsiLocalStorage';
 
 import {
+    NOTIFICATION_TIMEOUT,
     showErrorNotification,
     showNotification,
     showWarningNotification
             cls,
             messageKey,
             messageArguments,
-            timeout = 2500) {
+            timeout = NOTIFICATION_TIMEOUT) {
         APP.store.dispatch(showNotification({
             descriptionArguments: messageArguments,
             descriptionKey: messageKey,

react/features/base/participants/actions.js

 import throttle from 'lodash/throttle';
 
 import { set } from '../redux';
-import { showNotification } from '../../notifications';
+import { NOTIFICATION_TIMEOUT, showNotification } from '../../notifications';
 
 import {
     DOMINANT_SPEAKER_CHANGED,
 
     if (notificationProps) {
         dispatch(
-            showNotification(notificationProps, 2500));
+            showNotification(notificationProps, NOTIFICATION_TIMEOUT));
     }
 
     joinedParticipantsNames = [];

react/features/base/participants/middleware.js

 
 import UIEvents from '../../../../service/UI/UIEvents';
 
-import { showNotification } from '../../notifications';
+import { NOTIFICATION_TIMEOUT, showNotification } from '../../notifications';
 import { CALLING, INVITED } from '../../presence-status';
 
 import { APP_WILL_MOUNT, APP_WILL_UNMOUNT } from '../app';
                 name: getParticipantDisplayName(getState, participant.getId())
             },
             titleKey: 'notify.raisedHand'
-        }, 2500));
+        }, NOTIFICATION_TIMEOUT));
     }
 }
 

react/features/notifications/constants.js

 // @flow
 
+/**
+ * The standard time when auto-disappearing notifications should disappear.
+ */
+export const NOTIFICATION_TIMEOUT = 2500;
+
 /**
  * The set of possible notification types.
  *

react/features/notifications/index.js

 export * from './actions';
 export * from './actionTypes';
 export * from './components';
+export * from './constants';
 export * from './functions';
 
 import './middleware';

react/features/recording/actions.js

 
 import JitsiMeetJS, { JitsiRecordingConstants } from '../base/lib-jitsi-meet';
 import {
+    NOTIFICATION_TIMEOUT,
     hideNotification,
     showErrorNotification,
     showNotification
         titleKey: 'dialog.recording'
     };
 
-    return showNotification(dialogProps, 2500);
+    return showNotification(dialogProps, NOTIFICATION_TIMEOUT);
 }
 
 /**

react/features/transcribing/actions.js

     STOP_TRANSCRIBING
 } from './actionTypes';
 import {
+    NOTIFICATION_TIMEOUT,
     hideNotification,
     showErrorNotification,
     showNotification
 
 /**
  * Signals that the stopped transcribing notification should be shown on the
- * screen for a 2500 ms.
+ * screen.
  *
  * @returns {showNotification}
  */
     return showNotification({
         descriptionKey: 'transcribing.off',
         titleKey: 'dialog.transcribing'
-    }, 2500);
+    }, NOTIFICATION_TIMEOUT);
 }