I'm trying to make a basic creep that will go and repair very damaged buildings around my base, but the creep seems to do nothing even though I'm getting no errors.

My code for the repair creep:

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

        if(creep.memory.reparing && creep.carry.energy == 0) {
            creep.memory.repairing = false;
        }
        if(!creep.memory.repairing && creep.carry.energy == creep.carryCapacity) {
            creep.memory.repairing = true;
        }

        if(creep.memory.repairing) {
            var targets = creep.room.find(FIND_STRUCTURES, {
             filter: object => object.hits < (object.hitsMax/4)
            });

            targets.sort((a,b) => a.hits - b.hits);

            if(targets.length > 0) {
                if(creep.repair(targets[0]) == ERR_NOT_IN_RANGE) {
            creep.moveTo(targets[0]);    
    }
}
        } else {
            var sources = creep.room.find(FIND_SOURCES);
            if(creep.harvest(sources[0]) == ERR_NOT_IN_RANGE) {
                creep.moveTo(sources[0]);
            }
        }
    }
};
module.exports = roleRepairer;

And in the main module i call

var roleRepairer = require('role.repairer');

and then run the role with

if(creep.memory.role == 'repairer') {
            roleRepairer.run(creep);
        }