What is the library that makes creating GUIs via scripts much easier?

A few days ago I came across this library that does what the title says, but I need it now and can’t find it again. It is similar to this, where you just put all of the properties of the gui into one function:

local collapse = CollapsibleTitledSection.new(
	"suffix", -- name suffix of the gui object
	"titleText", -- the text displayed beside the collapsible arrow
	true, -- show the title text?
	true, -- minimizable?
	false -- minimized by default?
)

(Taken from the StudioWidgets GitHub)

Can anyone tell me what it is called, I really can’t remember.

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Roact? Because it doesn’t just do that.

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That’d be it, thanks!