Fragment.compose lets you package any combination of bind, derive, hold, await, and pull into a reusable binding function — Fragment's equivalent of a custom hook.

The returned function injects _activeHandle automatically, so the inner function receives the correct Handle without being called as a method.

Methods

Fragment.compose(fn)

Creates a composable binding. fn receives the active Handle as its first argument, followed by any arguments passed at call-site.

Example:

local useWindow = Fragment.compose(function(handle, windowName: string)
    local win    = handle:pull(WindowContext)
    local isOpen = handle:derive(function()
        return win.active == windowName
    end, { win.active })

    return isOpen, win
end)

return useWindow

local useWindow = require(path.to.useWindow)

return Handle(function(element: Frame)
    local isOpen, win = useWindow("Shop") 

    element.Visible = isOpen()

    Handle.Connect("Close", closeBtn.Activated, function()
        win.close("Shop")
    end)
end)