get istanbul and sandboxed-module to party

istanbul-sandbox.coffee

SandboxedModule = require('sandboxed-module')

global.requireSubject = (path, requires) ->
  SandboxedModule.require("./../../#{path}",  {requires})

_ = require('underscore')
coverageVariable = _(global).chain().keys().find((k) -> k.indexOf("$$cov_") == 0).value()

if coverageVariable?
  fs = require("fs")

  SandboxedModule::_getCompileInfo = ->
    localVariables = []
    localValues = []
    for localVariable of @locals
      localVariables.push localVariable
      localValues.push @locals[localVariable]
    sourceToWrap = instrument(fs.readFileSync(@filename, "utf8"), @filename)

    if @filename.search(".coffee$") != -1
      try
        coffeeScript = require("coffee-script")
        sourceToWrap = coffeeScript.compile(sourceToWrap)

    source = "global = GLOBAL = root = (function() { return this; })();" + "(function(" + localVariables.join(", ") + ") { " + sourceToWrap + "\n" + "return global;\n" + "});"
    source: source
    parameters: localValues

  snagInstrumentTransformerFromIstanbul = ->
    Instrumenter = require('istanbul').Instrumenter
    instrumenter = new Instrumenter({coverageVariable})
    instrumenter.instrumentSync.bind(instrumenter)

  instrument = snagInstrumentTransformerFromIstanbul()

I had a similar issue when I tried to get something I build with component to build with browserify, I ended up making a grunt plugin that would use espirma to rename all the instances of require in one of them.