Version of box2d javascript in gd 4?

Hello, I’m sorry, my English I speak Spanish … I wanted to ask you what version of box2d javascript uses gd4. I want to modify this property b2_velocityThreshold in box2d.js but it is minified. And I wanted to download the normal version but the same version to have no drawbacks or can you tell me how I can change the value of that property? It’s about the physics issue in a billiard game where the balls are drawn towards the wall. Thank you very much