Thanks, yeah, I was missing that 'require' at the beginning of the main. 

I'm trying to make a creep to go around repairing structures, and I'm having this issue:

I create a module

role.fixer

which has this:

var roleFixer = {

/** @param {Creep} creep **/
run: function(creep) {

//code to fix things
}
};

module.exports = roleFixer;

When I put the following in my main:

if(creep.memory.role == 'fixer') {
roleFixer.run(creep);
}

I get this error:

ReferenceError: roleFixer is not defined
at Object.module.exports.loop (main:59:13)
at __mainLoop:1:52

What am I doing wrong? The role.fixer module looks the same as my other roles, so I can't figure out why it's not 'defined'.