Running the update script update-app-ng-deps is providing TypeScript as a dependency instead as a devDependency

Steps to reporduce:

• Create ng app

tns create my-app --ng

• Run the update script

 ./node_modules/.bin/update-app-ng-deps

Result: the typescript is installed as a dependency instead as devDependency

Using:
NPM 6.6.0
Node 10.15.0