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It is licensed under the Apache License 2.0. The TypeScript compiler is itself written in TypeScript and compiled to JavaScript.

TypeScript headers for the Node.js library modules are also available, allowing development of Node.js programs within TypeScript. There are third-party header files for popular libraries such as jQuery, MongoDB, and D3.js. This enables other programs to use the values defined in the files as if they were statically typed TypeScript entities. TypeScript supports definition files that can contain type information of existing JavaScript libraries, much like C++ header files can describe the structure of existing object files. The default TypeScript Compiler can be used, or the Babel compiler can be invoked to convert TypeScript to JavaScript. Multiple options are available for transpilation. TypeScript may be used to develop JavaScript applications for both client-side and server-side execution (as with Node.js or Deno).

Because TypeScript is a superset of JavaScript, all JavaScript programs are syntactically valid TypeScript, but they can fail to type-check for safety reasons. It is designed for the development of large applications and transpiles to JavaScript. TypeScript is a free and open-source high-level programming language developed by Microsoft that adds static typing with optional type annotations to JavaScript.