What is happening here?

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local Icon = require(ReplicatedStorage.SharedModules.Premade.Icon)
Icon.new()
:setImage(2243841635)
:setLabel("Leaderboard")
:setCaption("Open Leaderboard")
:bindToggleKey(Enum.KeyCode.Tab)
:align("Right")