Move SignalProtocolStore to TypeScript

ts/test-both/util/isNotNil_test.ts

@@ -0,0 +1,24 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { isNotNil } from '../../util/isNotNil';
+
+describe('isNotNil', () => {
+  it('returns false if provided null value', () => {
+    assert.isFalse(isNotNil(null));
+  });
+
+  it('returns false is provided undefined value', () => {
+    assert.isFalse(isNotNil(undefined));
+  });
+
+  it('returns false is provided any other value', () => {
+    assert.isTrue(isNotNil(0));
+    assert.isTrue(isNotNil(4));
+    assert.isTrue(isNotNil(''));
+    assert.isTrue(isNotNil('string value'));
+    assert.isTrue(isNotNil({}));
+  });
+});