fixup! fixup! chore: cleanup package and dependencies, add null checks, bump build target

Author: SimonSchick

src/tsconfig.json

@@ -1,16 +1,11 @@
 {
   "compilerOptions": {
     "target": "es6",
-    "noImplicitAny": true,
     "noImplicitReturns": true,
-    "noImplicitThis": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,
     "suppressImplicitAnyIndexErrors": true,
-    "strictNullChecks": true,
-    "strictFunctionTypes": true,
-    "strictPropertyInitialization": true,
-    "alwaysStrict": true,
+    "strict": true,
     "lib": ["es6", "dom"],
     "module": "commonjs",
     "moduleResolution": "node",