Does anyone know what docking engine Replit uses for their editor?

I want to build an editor in Javascript that allows tab docking (moving tabs around and placing them in different spots) and also moving groups of tabs together. I haven’t found a javascript library that does this well. I love the way the replit editor handles this.

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I’d assume that Replit has its own tab docking library. Try using Golden Layout, which does things pretty similarly:

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They have expressly avoided implementing grouped tabs. An earlier version was starting to implement it. They called it a “stack”. But it was abandoned.