Runs a tween inside a loop that can be used alongside the task library

rawTween.lua

local function rawTween(tweenInfo: TweenInfo, tweenCallback: (tweenAlpha: number) -> nil)
	local tweenEasingStyle = tweenInfo.EasingStyle
	local tweenEasingDirection = tweenInfo.EasingDirection

	local tweenRepeatCount = tweenInfo.RepeatCount
	local tweenIndefinitely = tweenRepeatCount<=-1

	local tweenDelay = tweenInfo.DelayTime
	local tweenDuration = tweenDelay + tweenInfo.Time
	local tweenReverses = tweenInfo.Reverses

	if tweenReverses then
		tweenDuration += tweenInfo.Time
	end

	local TweenService = game:GetService("TweenService")

	local tweensRemaining = tweenRepeatCount + 1
	while tweenIndefinitely or tweensRemaining>0 do
		local startTime = tick() + tweenDelay
		local endTime = (startTime - tweenDelay) + tweenDuration
		while tick()<endTime do
			local timeElapsed = tick()-startTime
			if timeElapsed>0 then
				local currentAlpha = timeElapsed / (tweenDuration-tweenDelay)
				if tweenReverses then
					currentAlpha = if currentAlpha>0.5 then -2 * currentAlpha + 2 else 2 * currentAlpha
				end
				local tweenAlpha = TweenService:GetValue(currentAlpha, tweenEasingStyle, tweenEasingDirection)
				tweenCallback(tweenAlpha)
			else
				tweenCallback(0)
			end
			task.wait()
		end
		tweensRemaining = math.max(tweensRemaining-1, 0)
	end
	--ensures the last tweenAlpha is an integer and not a float
	tweenCallback(if tweenReverses then 0 else 1)
end