chore: polish TypeScript configuration

Author: mpalourdio

tsconfig.lib.json

@@ -9,6 +9,9 @@
     "inlineSources": true,
     "types": []
   },
+  "include": [
+    "**/*.ts"
+  ],
   "exclude": [
     "**/*.spec.ts"
   ]

tsconfig.spec.json

@@ -9,7 +9,6 @@
     ]
   },
   "include": [
-    "**/*.spec.ts",
-    "**/*.d.ts"
+    "src/**/*.ts"
   ]
 }