TypeScript doesn’t replace other programming languages but rather works alongside JavaScript. Since TypeScript is a superset of JavaScript, it can be used in any environment where JavaScript runs, including web browsers, Node.js servers, and mobile development platforms. It also integrates well with frameworks and libraries written in JavaScript, such as React, Angular, and Vue.js. Additionally, developers often use TypeScript in multi-language projects alongside languages like Python, Java, or C# for scenarios like microservices, where different languages handle various parts of a system but interact via APIs.