Enable JavaScript autocomplete in editors and IDEs

Automatically picks up JSDoc annotations and works with IntelliJ, WebStorm, Visual Studio, Visual Studio Code, Sublime Text (via the TypeScript plugin)

1. Adds module `NodeNext` for Node.js 16+
2. Adds resolveJsonModule for JSON autocomplete

jsconfig.json

@@ -0,0 +1,6 @@
+{
+  "compilerOptions": {
+    "module": "NodeNext",
+    "resolveJsonModule": true
+  }
+}