greensock-closure-externs
Use the externs for advanced closure compilation if you want to include the greensock animation framework. Externs were created for GSAP version 1.18.2.
Help and instructions for using the advanced closure compilation could be found here : https://developers.google.com/closure/compiler/docs/api-tutorial3
Full documentation for the GreenSock JS-API : http://api.greensock.com/js/