It has fairly good docs: http://doc.babylonjs.com/ as well as an active forum for developers and users: http://www.html5gamedevs.com/forum/16-babylonjs/
Other options mentioned are also good - the Typescript compiler (https://github.com/Microsoft/TypeScript) is good to get started with especially if you read this Gitbook: https://basarat.gitbooks.io/typescript/content/docs/compiler...
You could also search popular typescript github projects that are more closely related to what you work on, but the Typescript compiler and Babylonjs 3d engine are both well written projects with fairly good documentation in my opinion.
It has fairly good docs: http://doc.babylonjs.com/ as well as an active forum for developers and users: http://www.html5gamedevs.com/forum/16-babylonjs/
Other options mentioned are also good - the Typescript compiler (https://github.com/Microsoft/TypeScript) is good to get started with especially if you read this Gitbook: https://basarat.gitbooks.io/typescript/content/docs/compiler...
You could also search popular typescript github projects that are more closely related to what you work on, but the Typescript compiler and Babylonjs 3d engine are both well written projects with fairly good documentation in my opinion.