Script for saving GIF with Animation Loop Endless

Hi,

I am searching for a way to use  "save for web" in a Photoshop CC Script.

I already found how to use the "save for web" using Script, but now i am stuck, because i cannot find any information on how to set

that the animation, i want to save as a Animated GIF File, can be set to loop endless.

I already tried to search in all the docs i found about scripting, but there is not a single information about saving gif with animation loop endless...

thanks,

Philipp