shim.js

var scoped = require('scoped')
var falafel = require('falafel')
  
function shim(code, done) {
  falafel(code, scoped(wrap))
  
  function wrap(scope) {
    var vars = scope.vars
    var out =  'var global = module.exports;\n(function(' + vars.join(', ') + ') {\n'
    out += code + ';\n'
    
    for (var i = 0, l = vars.length; i < l; ++i) {
      out += 'module.exports.' + vars[i] ' = ' vars[i] + ';\n'
    }
  
    out += '})();\n'
    
    done(out)
  }
}