Improve cold start performance

ts/util/messageBatcher.ts

@@ -0,0 +1,24 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { MessageAttributesType } from '../model-types.d';
+import { createBatcher } from './batcher';
+import { createWaitBatcher } from './waitBatcher';
+
+export const updateMessageBatcher = createBatcher<MessageAttributesType>({
+  wait: 500,
+  maxSize: 50,
+  processBatch: async (messages: Array<MessageAttributesType>) => {
+    window.log.info('updateMessageBatcher', messages.length);
+    await window.Signal.Data.saveMessages(messages, {});
+  },
+});
+
+export const saveNewMessageBatcher = createWaitBatcher<MessageAttributesType>({
+  wait: 500,
+  maxSize: 30,
+  processBatch: async (messages: Array<MessageAttributesType>) => {
+    window.log.info('saveNewMessageBatcher', messages.length);
+    await window.Signal.Data.saveMessages(messages, { forceSave: true });
+  },
+});