update smartenv to support os information on nodejs

test/test.ts

@@ -1,5 +1,5 @@
 import { tap, expect } from 'tapbundle'
-import * as smartenv from '../dist/index'
+import * as smartenv from '../ts/index'
 
 let testEnv: smartenv.Smartenv
 
@@ -11,4 +11,22 @@ tap.test('should print a overview to console', async () => {
   testEnv.printEnv()
 })
 
+tap.test('should get os', async () => {
+  let resultLinux = await testEnv.isLinuxAsync()
+  let resultMac = await testEnv.isMacAsync
+  let resultWindows = await testEnv.isWindowsAsync()
+  const osModule = await import('os')
+  if (resultMac) {
+    expect(osModule.platform()).to.equal('darwin');
+    console.log('platform is Mac!')
+  } else if (resultLinux) {
+    expect(osModule.platform()).to.equal('linux');
+    console.log('platform is Linux!')
+  } else {
+    expect(osModule.platform()).to.equal('win32');
+    console.log('platform is Windows!')
+  }
+  
+})
+
 tap.start()