Port Settings and OS to TypeScript

ts/OS.ts

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+import is from '@sindresorhus/is';
+import os from 'os';
+import semver from 'semver';
+
+export const isMacOS = () => process.platform === 'darwin';
+export const isLinux = () => process.platform === 'linux';
+export const isWindows = (minVersion?: string) => {
+  const isPlatformValid = process.platform === 'win32';
+  const osRelease = os.release();
+  const isVersionValid = is.undefined(minVersion)
+    ? true
+    : semver.gte(osRelease, minVersion);
+
+  return isPlatformValid && isVersionValid;
+};

ts/test/types/Settings_test.ts

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+import os from 'os';
+import sinon from 'sinon';
+import { assert } from 'chai';
+
+import * as Settings from '../../../ts/types/Settings';
+
+describe('Settings', () => {
+  const sandbox = sinon.createSandbox();
+
+  describe('isAudioNotificationSupported', () => {
+    context('on macOS', () => {
+      beforeEach(() => {
+        sandbox.stub(process, 'platform').value('darwin');
+      });
+
+      afterEach(() => {
+        sandbox.restore();
+      });
+
+      it('should return true', () => {
+        assert.isTrue(Settings.isAudioNotificationSupported());
+      });
+    });
+
+    context('on Windows', () => {
+      context('version 8+', () => {
+        beforeEach(() => {
+          sandbox.stub(process, 'platform').value('win32');
+          sandbox.stub(os, 'release').returns('8.0.0');
+        });
+
+        afterEach(() => {
+          sandbox.restore();
+        });
+
+        it('should return true', () => {
+          assert.isTrue(Settings.isAudioNotificationSupported());
+        });
+      });
+    });
+
+    context('on Linux', () => {
+      beforeEach(() => {
+        sandbox.stub(process, 'platform').value('linux');
+      });
+
+      afterEach(() => {
+        sandbox.restore();
+      });
+
+      it('should return false', () => {
+        assert.isFalse(Settings.isAudioNotificationSupported());
+      });
+    });
+  });
+});

ts/types/Settings.ts

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+import * as OS from '../OS';
+
+export const isAudioNotificationSupported = () =>
+  OS.isWindows() || OS.isMacOS();