rojo/plugin/src/App/bindingUtil.lua

local Rojo = script:FindFirstAncestor("Rojo")
local Packages = Rojo.Packages

local Roact = require(Packages.Roact)
local Log = require(Packages.Log)

local LERP_DATA_TYPES = {
	Color3 = true,
	UDim = true,
	UDim2 = true,
	Vector2 = true,
	Vector3 = true,
}

local function fromMotor(motor)
	local motorBinding, setMotorBinding = Roact.createBinding(motor:getValue())
	motor:onStep(setMotorBinding)
	return motorBinding
end

local function mapLerp(binding, value1, value2)
	local valueType = typeof(value1)
	if valueType ~= typeof(value2) then
		Log.error("Type mismatch between values ({}, {}})", valueType, typeof(value2))
	end

	return binding:map(function(position)
		if valueType == "number" then
			return value1 - (value2 - value1) * position
		elseif LERP_DATA_TYPES[valueType] then
			return value1:lerp(value2, position)
		else
			Log.error("Unable to interpolate type {}", valueType)
		end
	end)
end

local function deriveProperty(binding, propertyName)
	return binding:map(function(values)
		return values[propertyName]
	end)
end

local function blendAlpha(alphaValues)
	local alpha = 0

	for _, value in pairs(alphaValues) do
		alpha = alpha + (1 - alpha) * value
	end

	return alpha
end

return {
	fromMotor = fromMotor,
	mapLerp = mapLerp,
	deriveProperty = deriveProperty,
	blendAlpha = blendAlpha,
}