fib.coffee

f = (n) ->
    if n is 0
        0
    else if n is 1
        1
    else
        f(n-1) + f(n-2)

module.exports = f

main.coffee

ipc = require 'ipc'
fib = require './fib'

ipc.on 'find-fib', (event, num) ->
    console.log '2'
    setTimeout ->
        console.log '5'
        event.sender.send 'fib-result', fib(45)
    , 2000
    console.log '3'

renderer.coffee

ipc = require 'ipc'

ipc.on 'fib-result', (result) ->
    console.log '6'
    console.log result

$ ->
    $('#fib-start').click ->
        console.log '1'
        ipc.send 'find-fib', 45
        console.log '4'