The TypeScript Wiki is for people who are interested in:

• Debugging TypeScript problems: Performance, Tracing, Debugging
• Using the compiler API
• Wanting to contribute to the TypeScript codebase or to understand the compiler
• Looking for the old TS version of the compiler? The last TS6 revision is here.

It is also used as a scratch-pad for one-off links which are useful when triaging GitHub issues. For example the FAQ

If you are after documentation on how to use TypeScript the language, or the build tool: please see: https://www.typescriptlang.org