Merge pull request EbookFoundation#1647 from basarat/patch-1

📝 TypeScript Deep Dive

Author: vhf

free-programming-books.md

@@ -1899,6 +1899,7 @@ See also [LaTeX](#latex)
 
 
 ### TypeScript
+* [TypeScript Deep Dive](https://basarat.gitbooks.io/typescript/)
 * [TypeScript for C# Programmers](http://www.infoq.com/minibooks/typescript-c-sharp-programmers)
 * [TypeScript Succinctly, Syncfusion](http://www.syncfusion.com/resources/techportal/ebooks/typescript) (PDF, Kindle) *(Just fill the fields with any values)*