Advanced Projects

Prerequisites: Level 3 — Advanced.

Convert a JavaScript Project to TypeScript

Take one of your own earlier JavaScript projects and migrate it incrementally, following the Level 3 migration lesson.

Type-Safe SDK with Declaration Files

Build a small library wrapping a public API, publish-ready with its own generated .d.ts files, so consumers get full autocomplete.

Full-Stack TypeScript App

An Express (or NestJS) backend and a typed frontend, sharing type definitions for API request/response shapes between both via a small shared package.