Create Notification normalizer

app/soapbox/normalizers/__tests__/notification-test.js

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+import { Record as ImmutableRecord, fromJS } from 'immutable';
+
+import { normalizeNotification } from '../notification';
+
+describe('normalizeNotification()', () => {
+  it('normalizes an empty map', () => {
+    const notification = fromJS({});
+    const result = normalizeNotification(notification);
+
+    expect(ImmutableRecord.isRecord(result)).toBe(true);
+    expect(result.type).toEqual('');
+    expect(result.account).toBe(null);
+    expect(result.target).toBe(null);
+    expect(result.status).toBe(null);
+    expect(result.id).toEqual('');
+  });
+});

app/soapbox/normalizers/notification.ts

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+import {
+  Map as ImmutableMap,
+  Record as ImmutableRecord,
+} from 'immutable';
+
+// https://docs.joinmastodon.org/entities/notification/
+const NotificationRecord = ImmutableRecord({
+  account: null,
+  chat_message: null, // pleroma:chat_mention
+  created_at: new Date(),
+  emoji: null, // pleroma:emoji_reaction
+  id: '',
+  status: null,
+  target: null, // move
+  type: '',
+});
+
+export const normalizeNotification = (notification: ImmutableMap<string, any>) => {
+  return NotificationRecord(notification);
+};