Error directory not empty `www\assets\js` on `ionic cordova run`

# Bug Report

- Ionic CLI PRO 4.1.2
- Angular CLI: 1.7.3
- cordova 8.0.0
- node v8.12.0
- npm 6.4.1
- Windows 10

Runing `ionic cordova run android --device` I get this response:

```
ENOTEMPTY: directory not empty, rmdir 'C:\Develop\Ionic\myapp\www\assets\js'
Error: ENOTEMPTY: directory not empty, rmdir 'C:\Develop\Ionic\myapp\www\assets\js'
at Object.fs.rmdirSync (fs.js:846:18)
at Observable.rxjs_1.Observable [as _subscribe] (C:\Develop\Ionic\myapp\node_modules\@angular\cli\node_modules\@angular-devkit\core\node\host.js:188:28)
at Observable._trySubscribe (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\Observable.js:43:25)
at Observable.subscribe (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\Observable.js:29:22)
at C:\Develop\Ionic\app\node_modules\rxjs\internal\util\subscribeTo.js:22:31
at Object.subscribeToResult (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\util\subscribeToResult.js:7:45)
at MergeMapSubscriber._innerSub (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\operators\mergeMap.js:75:38)
at MergeMapSubscriber._tryNext (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\operators\mergeMap.js:72:14)
at MergeMapSubscriber._next (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\operators\mergeMap.js:55:18)
at MergeMapSubscriber.Subscriber.next (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\Subscriber.js:64:18)
at Observable._subscribe (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\util\subscribeToArray.js:5:20)
at Observable._trySubscribe (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\Observable.js:43:25)
at Observable.subscribe (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\Observable.js:29:22)
at MergeMapOperator.call (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\operators\mergeMap.js:35:23)
at Observable.subscribe (C:\Develop\Ionic\myapp\node_modules\rxjs\internal\Observable.js:24:22)
at C:\Develop\Ionic\myapp\node_modules\rxjs\internal\util\subscribeTo.js:22:31
[ERROR] An error occurred while running subprocess ng.
```

**Describe the Bug**

That means the CLI is not propertli compiling the app.

I solve this by deleting the file called _js_ manually.

**Steps to Reproduce**
I get this error sometimes when I compile the app.

**Related Code**
Isn't relevant.

**Expected Behavior**
Actualy I dont have expectatives about this issue.

**Additional Context**
This is my pacakage.json

```json
{
"name": "myapp",
"version": "0.2.0",
"author": "Ionic Framework",
"homepage": "http://ionicframework.com/",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/common": "~6.1.1",
"@angular/core": "~6.1.1",
"@angular/forms": "~6.1.1",
"@angular/http": "~6.1.1",
"@angular/platform-browser": "~6.1.1",
"@angular/platform-browser-dynamic": "~6.1.1",
"@angular/router": "~6.1.1",
"@ionic-native/bluetooth-serial": "^5.0.0-beta.19",
"@ionic-native/camera": "^5.0.0-beta.19",
"@ionic-native/core": "^5.0.0-beta.19",
"@ionic-native/crop": "^5.0.0-beta.19",
"@ionic-native/facebook": "^5.0.0-beta.19",
"@ionic-native/file": "^5.0.0-beta.19",
"@ionic-native/file-path": "^5.0.0-beta.19",
"@ionic-native/file-transfer": "^5.0.0-beta.19",
"@ionic-native/google-plus": "^5.0.0-beta.19",
"@ionic-native/push": "^5.0.0-beta.19",
"@ionic-native/splash-screen": "^5.0.0-beta.19",
"@ionic-native/status-bar": "^5.0.0-beta.19",
"@ionic/angular": "^4.0.0-beta.8",
"@ionic/storage": "^2.2.0",
"@ngx-translate/core": "^10.0.2",
"@ngx-translate/http-loader": "^3.0.1",
"chart.js": "^2.7.2",
"cordova-android": "7.1.1",
"cordova-browser": "5.0.4",
"cordova-plugin-bluetooth-serial": "^0.4.7",
"cordova-plugin-camera": "^4.0.3",
"cordova-plugin-crop": "^0.4.0",
"cordova-plugin-device": "^2.0.2",
"cordova-plugin-facebook4": "^3.0.0",
"cordova-plugin-file": "^6.0.1",
"cordova-plugin-file-transfer": "^1.7.1",
"cordova-plugin-filepath": "^1.4.2",
"cordova-plugin-googleplus": "^5.3.1",
"cordova-plugin-ionic-keyboard": "^2.1.2",
"cordova-plugin-ionic-webview": "^2.1.3",
"cordova-plugin-splashscreen": "^5.0.2",
"cordova-plugin-statusbar": "^2.4.2",
"cordova-plugin-whitelist": "^1.3.3",
"core-js": "^2.5.3",
"ngx-image-cropper": "^1.0.2",
"phonegap-plugin-push": "^2.1.3",
"rxjs": "6.2.2",
"rxjs-compat": "^6.3.2",
"zone.js": "^0.8.26"
},
"devDependencies": {
"@angular-devkit/architect": "~0.8.0-rc.1",
"@angular-devkit/build-angular": "~0.8.0-rc.1",
"@angular-devkit/core": "~0.8.0-rc.1",
"@angular-devkit/schematics": "~0.8.0-rc.1",
"@angular/cli": "~6.1.1",
"@angular/compiler": "~6.1.1",
"@angular/compiler-cli": "~6.1.1",
"@angular/language-service": "~6.1.1",
"@ionic/ng-toolkit": "^1.0.0",
"@ionic/schematics-angular": "^1.0.0",
"@types/jasmine": "~2.8.6",
"@types/jasminewd2": "~2.0.3",
"@types/node": "~10.9.2",
"codelyzer": "~4.4.2",
"jasmine-core": "~2.99.1",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~3.0.0",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~2.0.0",
"karma-jasmine": "~1.1.1",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.4.0",
"ts-node": "~7.0.0",
"tslint": "~5.11.0",
"typescript": "~2.9.2"
},
"description": "An Ionic project",
"cordova": {
"plugins": {
"cordova-plugin-whitelist": {},
"cordova-plugin-statusbar": {},
"cordova-plugin-device": {},
"cordova-plugin-splashscreen": {},
"cordova-plugin-ionic-webview": {},
"cordova-plugin-ionic-keyboard": {},
"cordova-plugin-bluetooth-serial": {},
"cordova-plugin-camera": {},
"cordova-plugin-file-transfer": {},
"cordova-plugin-file": {},
"cordova-plugin-filepath": {},
"cordova-plugin-googleplus": {
"REVERSED_CLIENT_ID": "...",
"WEB_APPLICATION_CLIENT_ID": "..."
},
"cordova-plugin-crop": {},
"phonegap-plugin-push": {
"SENDER_ID": "839877088416",
"FCM_VERSION": "11.8.0"
},
"cordova-plugin-facebook4": {
"APP_ID": "...",
"APP_NAME": "...",
"FACEBOOK_ANDROID_SDK_VERSION": "4.36.1"
}
},
"platforms": [
"android",
"browser"
]
}
}
```