Refactor server reducer into TypeScript (#39089)

app/javascript/mastodon/actions/server.ts

@@ -0,0 +1,34 @@
+import {
+  apiGetInstance,
+  apiGetExtendedDescription,
+  apiGetDomainBlocks,
+  apiGetTranslationLanguages,
+} from 'mastodon/api/instance';
+import { createDataLoadingThunk } from 'mastodon/store/typed_functions';
+
+import { importFetchedAccount } from './importer';
+
+export const fetchServer = createDataLoadingThunk(
+  'server/fetch',
+  () => apiGetInstance(),
+  (instance, { dispatch }) => {
+    if (instance.contact.account) {
+      dispatch(importFetchedAccount(instance.contact.account));
+    }
+  },
+);
+
+export const fetchExtendedDescription = createDataLoadingThunk(
+  'server/extended_description',
+  () => apiGetExtendedDescription(),
+);
+
+export const fetchServerTranslationLanguages = createDataLoadingThunk(
+  'server/translation_languages',
+  () => apiGetTranslationLanguages(),
+);
+
+export const fetchDomainBlocks = createDataLoadingThunk(
+  'server/domain_blocks',
+  () => apiGetDomainBlocks(),
+);