Upgraded to TNS 4.1.0. Unable to build platforms. Error '--allowJS' is not set.

From @shivapersad on June 4, 2018 19:55

Did you verify this is a real problem by searching the NativeScript Forum and the other open issues in this repo? Yes

Which platform(s) does your issue occur on?

Both

"nativescript": {
    "id": "org.ngccng.cngApp",
    "tns-ios": {
      "version": "4.1.0"
    },
    "tns-android": {
      "version": "4.1.1"
    }
  },
  "dependencies": {
    "@angular/animations": "~4.1.0",
    "@angular/common": "~4.1.0",
    "@angular/compiler": "~4.1.0",
    "@angular/core": "~4.1.0",
    "@angular/forms": "~4.1.0",
    "@angular/http": "~4.1.0",
    "@angular/platform-browser": "~4.1.0",
    "@angular/router": "~4.1.0",
    "nativescript-angular": "~3.0.0",
    "nativescript-drop-down": "3.1.3",
    "nativescript-fancyalert": "^1.1.2",
    "nativescript-iqkeyboardmanager": "^1.1.0",
    "nativescript-mapbox": "2.4.0",
    "nativescript-phone": "^1.3.1",
    "nativescript-theme-core": "~1.0.2",
    "reflect-metadata": "~0.1.8",
    "rxjs": "~5.3.0",
    "tns-core-modules": "^4.1.0",
    "validator": "^6.2.1",
    "zone.js": "~0.8.2"
  },
  "devDependencies": {
    "babel-traverse": "^6.26.0",
    "babel-types": "6.25.0",
    "babylon": "6.17.4",
    "lazy": "1.0.11",
    "nativescript-dev-typescript": "~0.4.0",
    "typescript": "~2.2.1"
  }
}

I updated my version of TNS from 3.3.0 to 4.1.0. I removed my iOS and Android platforms. I ran “tns update” in the root folder which updated the application. When I run “tns build android” or “tns build ios” I get the following error message in my console:

node_modules/tns-core-modules/ui/styling/gradient.d.ts(7,25): error TS6143: Module ‘…/…/css/parser’ was resolved to ‘/Users/shivapersad/cngProject/cngApp/node_modules/tns-core-modules/css/parser.js’, but ‘–allowJs’ is not set.

TypeScript compiler failed with exit code 1**

I checked the file being displayed in the error message but I am not seeing the ‘–allowJs’ flag in the code. Any assistance is appreciated. Thanks.

Copied from original issue: NativeScript/NativeScript#5909

[arielnmz]

In my case I had some outdated dependencies, I just had to update typescript to 2.7.* and it works normally

[shivapersad]

@NickIliev I updated my package.json file with the dependencies above and my Nativescript project works fine. Thanks for your assistance in resolving my issue.