Higher order functions not working in casperjs - coffeescript

Question

I have function defined like this
casper.executeRemote = (fn,params)->
->
try
fn.apply(this,params)
catch e
console.log(e)
getLinks = ->
elems = document.querySelectorAll('#pagination-flickr a')
and i am calling the function like below
casper.then ->
all_links = #evaluate #executeRemote getLinks
casper.log all_links,'debug'
However I get the below error when i try to run this in casperjs
ReferenceError: Can't find variable: fn
The same code works fine, if i try in a browser console(compiled js). What is that I am doing wrong?

Answer 1

Of course they work, but not at the border to the page context:
Note: The arguments and the return value to the evaluate function must be a simple primitive object. The rule of thumb: if it can be serialized via JSON, then it is fine.
Closures, functions, DOM nodes, etc. will not work!
Thankfully there is the toString function on Functions. So, you can change your code a little to account for passing the function as a string and evaling inside of the page context.
(Untested) example:
casper.executeRemote = (fn,params)->
fn = eval('('+fn+')')
try
fn.apply(this,params)
catch e
console.log(e)
getLinks = ->
elems = document.querySelectorAll('#pagination-flickr a')
casper.then ->
all_links = #evaluate(#executeRemote, getLinks.toString())
casper.log all_links,'debug'

Answer 2

Based on #Artjom's answer. I modified the code as shown below, then it works
executeRemote = (fn,params)->
->
try
fn.apply(this,params)
catch e
console.log(e)
getLinks = ->
elems = document.querySelectorAll('#pagination-flickr a')
links = (link.href for link in elems)
remoteWrapper = (excRm,gL)->
excRm=eval('('+excRm+')')
gL=eval('('+gL+')')
fn=excRm(gL)
fn()
casper.on 'remote.message',(message)->
#echo message
casper.then ->
all_links = #evaluate remoteWrapper, executeRemote.toString(), getLinks.toString()
casper.log all_links,'debug'