The handbook has moved into the new TypeScript website repo, you can find the revised and updated handbook pages in /packages/documentation in that repo.
The TypeScript Handbook is a comprehensive guide to the TypeScript language. It is meant to be read online at the TypeScript website or directly from this repository.
For a more formal description of the language, see the latest TypeScript Language Specification.
TypeScript-Handbook is accepting contributions. If you've submitted a PR for an existing issue, please post a comment in the issue to avoid duplication of effort. See our CONTRIBUTING file for more information - it also contains guidelines for how to submit a PR.