fix: avoid getting js template in a ts project (#717)

* fix: avoid getting `js` template in a `ts` project as we don't have a `typescript` dependency in the templates anymore

* fix: generate tsconfig based on the nativescript-dev-webpack dependency

Author: Dimitar Tachev

Diff for: projectHelpers.js

@@ -13,11 +13,13 @@ const isTypeScript = ({ projectDir, packageJson } = {}) => {
 
     return (
         packageJson.dependencies &&
-        packageJson.dependencies.hasOwnProperty("typescript")
+        (packageJson.dependencies.hasOwnProperty("nativescript-dev-typescript") ||
+            packageJson.dependencies.hasOwnProperty("typescript"))
     ) || (
-        packageJson.devDependencies &&
-        packageJson.devDependencies.hasOwnProperty("typescript")
-    ) || isAngular({ packageJson });
+            packageJson.devDependencies &&
+            (packageJson.devDependencies.hasOwnProperty("nativescript-dev-typescript") ||
+                packageJson.devDependencies.hasOwnProperty("typescript"))
+        ) || isAngular({ packageJson });
 };
 
 const isAngular = ({ projectDir, packageJson } = {}) => {