This document discusses how TypeScript can optimize JavaScript code. TypeScript is a superset of JavaScript created by Anders Hejlsberg that adds types, classes and modules to JavaScript to make it more robust. It discusses how TypeScript can help resolve issues like sprawling JavaScript code that is difficult to refactor, test and debug. It provides examples of how to structure a TypeScript project using features like interfaces, classes and modules. It also demonstrates how to automate builds using Gulp to continuously watch files and recompile on changes.