redundant.coffee

# the variable I am trying to use
canvaskey = ""

# the callback method to set the variable
setkey = (item) =>
	canvaskey = item

# Starting the chain
getcanvaskey = () =>
	chrome.storage.local.get('key', (item) ->
		setkey(item.canvaskey)
	)

# this is the same as
localStorage.key
# or
localStorage['key']