optional/optional.js

Allows you to optionally include modules without surrounding everything with 'try/catch'

module.exports = function(module, options){
  try{
    if(module[0] in {".":1}){
      module = process.cwd() + module.substr(1);
    }
    return require(module);
  }catch(err){ 
    if (err.code !== "MODULE_NOT_FOUND" && options && options.rethrow) {
      throw err;
    }
  }
  return null;
};