TypeScript is a statically typed language out of the box, with that bringing all the benefits of compilation time code checking. It also has some nice structures and patterns such as union types, exhaustive check and a great and lightweight IDE – VisualStudioCode, providing more level of helpers and control over your TS code than JS. TypeScript is fully interoperable with JS and one can disable all the strictness on demand or choose proper level of it depending of the technology and business needs.