1 files changed, 9 insertions, 2 deletions
diff --git a/web/react/utils/constants.jsx b/web/react/utils/constants.jsx
index b641e966b..170a16049 100644
--- a/web/react/utils/constants.jsx
+++ b/web/react/utils/constants.jsx
@@ -119,7 +119,9 @@ export default {
     POST_LOADING: 'loading',
     POST_FAILED: 'failed',
     POST_DELETED: 'deleted',
-    POST_TYPE_JOIN_LEAVE: 'join_leave',
+    POST_TYPE_JOIN_LEAVE: 'system_join_leave',
+    SYSTEM_MESSAGE_PREFIX: 'system_',
+    SYSTEM_MESSAGE_PROFILE_IMAGE: '/static/images/logo_compact.png',
     RESERVED_TEAM_NAMES: [
         'www',
         'web',
@@ -389,7 +391,8 @@ export default {
         BACKSPACE: 8,
         ENTER: 13,
         ESCAPE: 27,
-        SPACE: 32
+        SPACE: 32,
+        TAB: 9
     },
     HighlightedLanguages: {
         diff: 'Diff',
@@ -429,6 +432,10 @@ export default {
         MARKDOWN_PREVIEW: {
             label: 'markdown_preview', // github issue: https://github.com/mattermost/platform/pull/1389
             description: 'Show markdown preview option in message input box'
+        },
+        EMBED_PREVIEW: {
+            label: 'embed_preview',
+            description: 'Show preview snippet of links below message'
         }
     }
 };