For web, mobile and backend
mobile: React Native provides you with a great out of the box solution for hybrid app development. Additionally the main gripe with it, the lack of built-in testing functions, is solved by TypeScript catching errors on compilation. Alternatively you can opt for native development for each platform where using TypeScript will still be a big help especially if you want one team work on implementations for both iOS and Android.
backend: The most popular backend use case for Typescript is serverless functions, in which case Node.js really shines, as it is designed to run on a single thread and can run well even in those environments, when computing resources are limited. Similarly in case of microservices its event driven architecture makes it perfect for Nets.js a TypeScript based framework often called the 'Angular of backend'. GraphQL is also greatly useful here as it uses its type system to describe data fields, preventing over and under-fetching, which makes it a natural fit with TypeScript.
Versatility, efficiency and interchangeability
Obviously there a numerous other libraries and frameworks available, but this should provide some insight into how versatile the language is. It also makes everything interchangeable: a mobile developer can fill in for a web developer and vice versa without much issue. Work and communication between developers is also much easier than when working with dynamically typed languages, where everyone comes up with individual solutions others have to be brought into. Perhaps most importantly one team can handle everything instead of needing separate teams for mobile, web and backend.
versatile: almost all libraries are now written in TypeScript which makes integration much easier
interchangeable: interdisciplinary developers which can help or even replace each other when needed
cost efficient: one team can handle every aspect of the project. with no need for separate teams for web and mobile development the costs are significantly lower