TypeScript Deep Dive by Basarat Ali Syed
ypeScript Deep Dive is billed as definitive guide to TypeScript. There’s good coverage of the language, explaining particularly well TypeScript’s type system. Dive into all the details that a JavaScript developer needs to know to be a great TypeScript developer. There’s tips, style guide, and more. The book is published under an open source license. There are editions available for EPUB, PDF, and MOBI.