harvester.js

module.exports = {
    run: function(creep) {
        if(creep.store.getFreeCapacity() > 0 && creep.memory[delivering]) {
            creep.memory[delivering] = false;
        }
        else {
            if(creep.store.getFreeCapacity() = 0 && !creep.memory[delivering]) {
                creep.memory[delivering] = true;
            }
        }

        if(creep.memory[delivering]) {
            var targets = creep.room.find(FIND_STRUCTURES, {
                filter: (structure) => {
                    return (structure.structureType == STRUCTURE_EXTENSION || structure.structureType == STRUCTURE_SPAWN) &&
                        structure.store.getFreeCapacity(RESOURCE_ENERGY) > 0;
                }
            });

            if(targets.length > 0) {
                if(creep.transfer(targets[0], RESOURCE_ENERGY) == ERR_NOT_IN_RANGE) {
                    creep.moveTo(targets[0], {visualizePathStyle: {stroke: '#ffffff'}});
                }
            }
        } else {
            var sources = creep.room.find(FIND_SOURCES);
            if(creep.harvest(sources[0]) == ERR_NOT_IN_RANGE) {
                creep.moveTo(sources[0]);
            }
        }
    },

    spawnInfo: {
        count: 2,
        label: 'Harvester',
        body: [WORK, CARRY, MOVE, MOVE],
        startMemory: {delivering: false}
    }
}