VariableLayer.coffee ---------------------------

class exports.VariableLayer extends Layer
    # initialization
    constructor: (@options={}) ->
        @options = _.defaults @options,
            @options.myVar ?= "a variable"

        super @options

        exports.myVar = @options.myVar

app.coffee ------------------------------------

{VariableLayer} = require "VariableLayer"
myVariableLayer = new VariableLayer
print myVariableLayer.myVar

-----------------------------------------------

result is undefined