feat: Add "Followers you know" widget to user profiles (#34652)

app/javascript/mastodon/actions/accounts_familiar_followers.ts

@@ -0,0 +1,22 @@
+import { createDataLoadingThunk } from 'mastodon/store/typed_functions';
+
+import { apiGetFamiliarFollowers } from '../api/accounts';
+
+import { importFetchedAccounts } from './importer';
+
+export const fetchAccountsFamiliarFollowers = createDataLoadingThunk(
+  'accounts_familiar_followers/fetch',
+  ({ id }: { id: string }) => apiGetFamiliarFollowers(id),
+  ([data], { dispatch }) => {
+    if (!data) {
+      return null;
+    }
+
+    dispatch(importFetchedAccounts(data.accounts));
+
+    return {
+      id: data.id,
+      accountIds: data.accounts.map((account) => account.id),
+    };
+  },
+);