Just getting started with Framer & CoffeeScript. This a a loop animation which modifies a layer's opacity

OpacityLoopAnimation.coffee

class OpacityLoopAnimation
	
	constructor: (options={}) ->
		fadeInAnimation = new Animation({
			layer: options.layer,
			properties: {
				opacity: 1.00
			}
			time: 1
			curve: Bezier.easeIn
		})
		
		@mainAnimation = fadeInAnimation
		
		fadeOutAnimation = fadeInAnimation.reverse()
		
		fadeInAnimation.onAnimationEnd ->
			fadeOutAnimation.start()
		
		fadeOutAnimation.onAnimationEnd ->
			fadeInAnimation.start()
			
	start: ->
		@mainAnimation.start()

Usage:

anim = new OpacityLoopAnimation({ layer: someLayer })
anim.start()