Use TS declarationMap

This will make go to definition go to the implementation instead of
the .d.ts file

src/tsconfig-library-base.json

@@ -2,6 +2,7 @@
   "extends": "./tsconfig-base.json",
   "compilerOptions": {
     "composite": true,
-    "strict": true
+    "strict": true,
+    "declarationMap": true
   }
 }