Jade got me feeling like 'undefined is not a fxn'

script.js

var fs = require('fs');
var jade = require('jade');

var writetofile = function(e){
	// convert string to buffer so i can write it
	var f = new Buffer(e, 'ascii');

	// this is sitting in a folder where i can 
	// compare it to the html i have
	fs.writeFile('/resources/wusbhtml/index1.html', f)
}


//./views/index.jade isnt done yet but im learning jade
// so i can port this site from php into something 
// I know (err, *ahem* dont know /yet!/)
var fn = jade.compileClient(fs.readFileSync('./views/index.jade', {encoding: 'ascii'}), {pretty:true});

writetofile(fn(locals)) // wtf is locals?