Gab Social. All are welcome.

app/javascript/gabsocial/reducers/accounts_counters.js

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+import {
+  ACCOUNT_FOLLOW_SUCCESS,
+  ACCOUNT_UNFOLLOW_SUCCESS,
+} from '../actions/accounts';
+import { ACCOUNT_IMPORT, ACCOUNTS_IMPORT } from '../actions/importer';
+import { Map as ImmutableMap, fromJS } from 'immutable';
+
+const normalizeAccount = (state, account) => state.set(account.id, fromJS({
+  followers_count: account.followers_count,
+  following_count: account.following_count,
+  statuses_count: account.statuses_count,
+}));
+
+const normalizeAccounts = (state, accounts) => {
+  accounts.forEach(account => {
+    state = normalizeAccount(state, account);
+  });
+
+  return state;
+};
+
+const initialState = ImmutableMap();
+
+export default function accountsCounters(state = initialState, action) {
+  switch(action.type) {
+  case ACCOUNT_IMPORT:
+    return normalizeAccount(state, action.account);
+  case ACCOUNTS_IMPORT:
+    return normalizeAccounts(state, action.accounts);
+  case ACCOUNT_FOLLOW_SUCCESS:
+    return action.alreadyFollowing ? state :
+      state.updateIn([action.relationship.id, 'followers_count'], num => num + 1);
+  case ACCOUNT_UNFOLLOW_SUCCESS:
+    return state.updateIn([action.relationship.id, 'followers_count'], num => Math.max(0, num - 1));
+  default:
+    return state;
+  }
+};