"I have come for your babies"

Ngl it's very hard to read with that formatting.
To post code, surround all the code with 3 backticks (``` code ``')

Here it is formatted better

var roleouterharvester = {

run: function(creep) {

    if(creep.carry.energy < creep.carryCapacity) 
{ creep.moveTo(new RoomPosition(4, 13, 'W58S46'));

{ var sources = creep.room.find(FIND_SOURCES);

        if(creep.harvest(sources[0]) == ERR_NOT_IN_RANGE) {

            creep.moveTo(sources[0], {visualizePathStyle: {stroke: '#ffaa00'}});

        }

    }
}

    Else { 
{creep.moveTo(new RoomPosition(48, 15, ' W59S46'));

{ var targets = creep.pos.findClosestByRange (FIND_STRUCTURES, {

                filter: (structure) => {

                    return (structure.structureType == 
STRUCTURE_EXTENSION)

                    && structure.energy < structure.energyCapacity;

                }

        }
});

        if(targets.length > 0) {

            if(creep.transfer(targets[0], RESOURCE_ENERGY) == 
ERR_NOT_IN_RANGE) {

                creep.moveTo(targets[0], {visualizePathStyle: {stroke: '#ffffff'}});

            }

        }

    }

}
};

module.exports = roleouterharvester;

Potentially a fixed version?

var roleouterharvester = {

run: function(creep) {
    if (creep.carry.energy < creep.carryCapacity) { 
        creep.moveTo(new RoomPosition(4, 13, 'W58S46'));
        if (creep.room.name == 'W58S46') {
            var sources = creep.room.find(FIND_SOURCES);

            if (creep.harvest(sources[0]) == ERR_NOT_IN_RANGE) {
                creep.moveTo(sources[0], {visualizePathStyle: {stroke: '#ffaa00'}});
            }
        }
    } else { 
        creep.moveTo(new RoomPosition(48, 15, ' W59S46'));
        var targets = creep.pos.findClosestByRange (FIND_STRUCTURES, {
                filter: (structure) => {
                    return (structure.structureType == 
STRUCTURE_EXTENSION && structure.energy < structure.energyCapacity);
                }
        });

        if(targets.length > 0) {
            if(creep.transfer(targets[0], RESOURCE_ENERGY) == 
ERR_NOT_IN_RANGE) {
                creep.moveTo(targets[0], {visualizePathStyle: {stroke: '#ffffff'}});
            }
        }
    }
}

};

module.exports = roleouterharvester;