A strict syntactical superset of JavaScript and adds optional static typing to the language.  TypeScript simplifies JavaScript code, making it easier to read and debug. 

Jesse Hall

Deno is a “modern” runtime for JavaScript and TypeScript that is built in Rust. This makes it very fast!
If you are familiar with Node.js, then you will be right at home with Deno. It is very similar but has some improvements over Node.js. In fact, the creator of Deno also created Node and Deno is meant to be the successor to Node.js.
Deno pairs nicely with MongoDB.

TypeScript

Quickstarts

All TypeScript Quickstarts

Getting Started with Deno & MongoDB