Emoji loading performance (#38784)

app/javascript/mastodon/features/emoji/database.ts

@@ -267,6 +267,11 @@ export async function searchCustomEmojisByShortcodes(shortcodes: string[]) {
   return results.filter((emoji) => shortcodes.includes(emoji.shortcode));
 }
 
+export async function loadAllCustomEmoji() {
+  const db = await loadDB();
+  return db.getAll('custom');
+}
+
 export async function loadLegacyShortcodesByShortcode(shortcode: string) {
   const db = await loadDB();
   return db.getFromIndex(

app/javascript/mastodon/features/emoji/normalize.ts

@@ -185,21 +185,16 @@ export function cleanExtraEmojis(extraEmojis?: CustomEmojiMapArg | null) {
   if (!extraEmojis) {
     return null;
   }
-  if (Array.isArray(extraEmojis)) {
-    return extraEmojis.reduce<ExtraCustomEmojiMap>(
-      (acc, emoji) => ({ ...acc, [emoji.shortcode]: emoji }),
-      {},
-    );
+  if (!Array.isArray(extraEmojis) && !isList(extraEmojis)) {
+    return extraEmojis;
   }
-  if (isList(extraEmojis)) {
-    return extraEmojis
-      .toJS()
-      .reduce<ExtraCustomEmojiMap>(
-        (acc, emoji) => ({ ...acc, [emoji.shortcode]: emoji }),
-        {},
-      );
+  const emojis: ExtraCustomEmojiMap = {};
+  const emojiArray = isList(extraEmojis) ? extraEmojis.toJS() : extraEmojis;
+  for (const emoji of emojiArray) {
+    emojis[emoji.shortcode] = emoji;
   }
-  return extraEmojis;
+
+  return emojis;
 }
 
 /**