diff --git a/js/modules/signal.js b/js/modules/signal.js
index 47450703b..b2e02900b 100644
--- a/js/modules/signal.js
+++ b/js/modules/signal.js
@@ -13,7 +13,6 @@ const Data = require('../../ts/sql/Client').default;
 const EmojiLib = require('../../ts/components/emoji/lib');
 const Groups = require('../../ts/groups');
 const GroupChange = require('../../ts/groupChange');
-const IndexedDB = require('./indexeddb');
 const OS = require('../../ts/OS');
 const Stickers = require('../../ts/types/Stickers');
 const RemoteConfig = require('../../ts/RemoteConfig');
@@ -419,7 +418,6 @@ exports.setup = (options = {}) => {
     EmojiLib,
     Groups,
     GroupChange,
-    IndexedDB,
     Migrations,
     OS,
     RemoteConfig,
diff --git a/ts/background.ts b/ts/background.ts
index f15d9e86e..13b603ebc 100644
--- a/ts/background.ts
+++ b/ts/background.ts
@@ -24,6 +24,7 @@ import type {
 } from './model-types.d';
 import * as Bytes from './Bytes';
 import * as Timers from './Timers';
+import * as indexedDb from './indexeddb';
 import type { WhatIsThis } from './window.d';
 import type { Receipt } from './types/Receipt';
 import { getTitleBarVisibility, TitleBarVisibility } from './types/Settings';
@@ -494,8 +495,6 @@ export async function startApp(): Promise<void> {
   //   of preload.js processing
   window.setImmediate = window.nodeSetImmediate;
 
-  const { removeDatabase: removeIndexedDB, doesDatabaseExist } =
-    window.Signal.IndexedDB;
   const { Message } = window.Signal.Types;
   const {
     upgradeMessageSchema,
@@ -551,7 +550,7 @@ export async function startApp(): Promise<void> {
 
   const version = await window.Signal.Data.getItemById('version');
   if (!version) {
-    const isIndexedDBPresent = await doesDatabaseExist();
+    const isIndexedDBPresent = await indexedDb.doesDatabaseExist();
     if (isIndexedDBPresent) {
       log.info('Found IndexedDB database.');
       try {
@@ -582,7 +581,7 @@ export async function startApp(): Promise<void> {
         log.info('Deleting IndexedDB file...');
 
         await Promise.all([
-          removeIndexedDB(),
+          indexedDb.removeDatabase(),
           window.Signal.Data.removeAll(),
           window.Signal.Data.removeIndexedDBFiles(),
         ]);
diff --git a/js/modules/indexeddb.js b/ts/indexeddb.ts
similarity index 81%
rename from js/modules/indexeddb.js
rename to ts/indexeddb.ts
index 4f1e38d7f..19f1f3ab0 100644
--- a/js/modules/indexeddb.js
+++ b/ts/indexeddb.ts
@@ -1,18 +1,9 @@
 // Copyright 2018-2022 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
 
-/* global window, clearTimeout, setTimeout */
-
 const LEGACY_DATABASE_ID = 'signal';
-const MESSAGE_MINIMUM_VERSION = 7;
 
-module.exports = {
-  doesDatabaseExist,
-  MESSAGE_MINIMUM_VERSION,
-  removeDatabase,
-};
-
-async function doesDatabaseExist() {
+export async function doesDatabaseExist(): Promise<boolean> {
   window.SignalContext.log.info(
     'Checking for the existence of IndexedDB data...'
   );
@@ -21,7 +12,7 @@ async function doesDatabaseExist() {
 
     let existed = true;
 
-    let timer = setTimeout(() => {
+    let timer: undefined | ReturnType<typeof setTimeout> = setTimeout(() => {
       window.SignalContext.log.warn(
         'doesDatabaseExist: Timed out attempting to check IndexedDB status'
       );
@@ -53,7 +44,7 @@ async function doesDatabaseExist() {
   });
 }
 
-function removeDatabase() {
+export function removeDatabase(): void {
   window.SignalContext.log.info(
     `Deleting IndexedDB database '${LEGACY_DATABASE_ID}'`
   );
diff --git a/ts/window.d.ts b/ts/window.d.ts
index 5df00531d..373a3dfe7 100644
--- a/ts/window.d.ts
+++ b/ts/window.d.ts
@@ -398,10 +398,6 @@ declare global {
         WhatsNewLink: typeof WhatsNewLink;
       };
       OS: typeof OS;
-      IndexedDB: {
-        removeDatabase: WhatIsThis;
-        doesDatabaseExist: WhatIsThis;
-      };
       Views: WhatIsThis;
       State: {
         createStore: typeof createStore;