This document discusses the benefits of using TypeScript, a superset of JavaScript that adds static type checking and compiler-checked syntax. It provides several examples of how TypeScript catches errors through type checking, such as passing arguments of the wrong type or missing required properties. It also notes that the TypeScript community has provided type declarations for thousands of JavaScript libraries to enable safer usage. While TypeScript adds types, code written in it is still valid JavaScript that can be migrated to over time without rewriting existing code.