Add bundle.ts files for browser bundling (#502)

packages/ui-keyring/src/bundle.ts

@@ -0,0 +1,11 @@
+// Copyright 2017-2021 @polkadot/ui-keyring authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import { Keyring } from './Keyring';
+
+export { Ledger } from '@polkadot/hw-ledger';
+export { packageInfo } from './packageInfo';
+
+const keyring = new Keyring();
+
+export { Keyring, keyring };

packages/ui-keyring/src/index.ts

@@ -3,13 +3,8 @@
 
 import './detectPackage';
 
-import { Keyring } from './Keyring';
+import { keyring } from './bundle';
 
-export { Ledger } from '@polkadot/hw-ledger';
-export { packageInfo } from './packageInfo';
-
-const keyring = new Keyring();
-
-export { Keyring, keyring };
+export * from './bundle';
 
 export default keyring;