main.js

var _ = require("lodash");
var performRoles = require("./performRoles.js");

performRoles({ foo: 1 });

package.json

{
  "name": "module-name",
  "version": "10.3.1",
  "description": "An example module to illustrate the usage of a package.json",
  "author": "Your Name <[email protected]>",
  "contributors": [{
    "name": "Foo Bar",
    "email": "[email protected]"
  }],
  "main": "lib/foo.js",
  "dependencies": {
    "lodash": "*"
  }
}

performRoles.js

module.exports = function(creeps){
    //console.log(Object.keys(creeps));
   
    _.forEach(creeps,function(i,creep){
        console.log(i, creep);
    })
}