Refactor, CLI arg, full type coverage w/ JSDoc, handle rollover year and most other errors

jsconfig.json

@@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "strict": true,
+    "noImplicitAny": true,
+    "strictFunctionTypes": true,
+    "strictPropertyInitialization": true,
+    "strictBindCallApply": true,
+    "noImplicitThis": true,
+    "noImplicitReturns": true,
+    "alwaysStrict": true,
+    "esModuleInterop": true,
+    "checkJs": true,
+    "allowJs": true,
+    "declaration": true,
+    "target": "es2021",
+    "module": "commonjs",
+    "outDir": "dist",
+    "types": ["node"]
+  },
+  "include": [
+    "./src/**/*.js"
+  ],
+  "verbose": true
+}