Rename themes -> flavours ? ?

app/javascript/flavours/glitch/reducers/custom_emojis.js

@@ -0,0 +1,16 @@
+import { List as ImmutableList } from 'immutable';
+import { STORE_HYDRATE } from 'flavours/glitch/actions/store';
+import { search as emojiSearch } from 'flavours/glitch/util/emoji/emoji_mart_search_light';
+import { buildCustomEmojis } from 'flavours/glitch/util/emoji';
+
+const initialState = ImmutableList();
+
+export default function custom_emojis(state = initialState, action) {
+  switch(action.type) {
+  case STORE_HYDRATE:
+    emojiSearch('', { custom: buildCustomEmojis(action.state.get('custom_emojis', [])) });
+    return action.state.get('custom_emojis');
+  default:
+    return state;
+  }
+};