Fixes website not loading for unlogged users (mastodon#27698)

app/javascript/mastodon/reducers/accounts.ts

@@ -41,40 +41,42 @@ const normalizeAccounts = (
   return state;
 };
 
-export const accountsReducer: Reducer<typeof initialState> = (
-  state = initialState,
-  action,
-) => {
-  const currentUserId = me;
-
-  if (!currentUserId)
+function getCurrentUser() {
+  if (!me)
     throw new Error(
       'No current user (me) defined when calling `accountsReducer`',
     );
 
+  return me;
+}
+
+export const accountsReducer: Reducer<typeof initialState> = (
+  state = initialState,
+  action,
+) => {
   if (revealAccount.match(action))
     return state.setIn([action.payload.id, 'hidden'], false);
   else if (importAccounts.match(action))
     return normalizeAccounts(state, action.payload.accounts);
-  else if (followAccountSuccess.match(action))
+  else if (followAccountSuccess.match(action)) {
     return state
       .update(
         action.payload.relationship.id,
         (account) => account?.update('followers_count', (n) => n + 1),
       )
       .update(
-        currentUserId,
+        getCurrentUser(),
         (account) => account?.update('following_count', (n) => n + 1),
       );
-  else if (unfollowAccountSuccess.match(action))
+  } else if (unfollowAccountSuccess.match(action))
     return state
       .update(
         action.payload.relationship.id,
         (account) =>
           account?.update('followers_count', (n) => Math.max(0, n - 1)),
       )
       .update(
-        currentUserId,
+        getCurrentUser(),
         (account) =>
           account?.update('following_count', (n) => Math.max(0, n - 1)),
       );

spec/system/unlogged_spec.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe 'UnloggedBrowsing' do
+  subject { page }
+
+  before do
+    visit root_path
+  end
+
+  it 'loads the home page' do
+    expect(subject).to have_css('div.app-holder')
+
+    expect(subject).to have_css('div.columns-area__panels__main')
+  end
+end