What is the 'dat.GUI'?

In this case ‘https://phaser.io/examples/v3/view/physics/arcade/body-controls#
the dat is undefined
I want to know, where is the dat definded?

Hello, as you can see in a comment in the source code at top is defined as global.
If you look at the source code is a lib loaded in frame.html from here:
https://labs.phaser.io/js/datgui.js

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Thanks a lot.
I have solved it with your help.