Large swathes of re-engineering

tsconfig.json

@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
-    "target": "ES2020",
+    "lib": ["es5", "es6"],
+    "target": "es6",
     "module": "commonjs",
     "rootDir": "./src",
     "outDir": "./dist",
@@ -10,6 +11,10 @@
     "forceConsistentCasingInFileNames": true,
     "strict": true,
     "strictNullChecks": true,
-    "skipLibCheck": true
+    "skipLibCheck": true,
+    "experimentalDecorators": true,
+    "emitDecoratorMetadata": true,
+    "strictPropertyInitialization": false,
+    "sourceMap": true
   }
 }