Use a shared tsconfig.

Don't duplicate compiler options across projects.

tsconfig.shared.json

@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "noEmitOnError": false,
+        "noEmitHelpers": true,
+        "target": "es5",
+        "module": "commonjs",
+        "declaration": false,
+        "noImplicitAny": false,
+        "noImplicitUseStrict": true,
+        "removeComments": true,
+        "experimentalDecorators": true,
+        "diagnostics": true,
+        "sourceMap": true,
+        "jsx": "react",
+        "reactNamespace": "UIBuilder",
+        "lib": [
+            "es6", "dom"
+        ]
+    }
+}