roomPosition.prototype.js

module.exports = function () {
    /**
     * Checks if a path exists from this position to the given target.
     * 
     * @param {(RoomPosition|Object)} target - The position of the target, or an object with a RoomPosition (.pos) property.
     * @param {Object} [options]
     * @param {number} [options.range] - The range away from the target that a path is valid to.
     * @param {boolean} [options.ignoreCreeps] - True if creeps should be ignored when checking for a path.
     */
    RoomPosition.prototype.hasPathTo = function (target, {range = 1, ignoreCreeps = false}={}) {
        let targetRoomName;
        if (target instanceof RoomPosition) {
            targetRoomName = target.roomName;
        } else if (target.pos && (target.pos instanceof RoomPosition)) {
            targetRoomName = target.pos.roomName;
        } else {
            throw new Error('target invalid');
        }
        
        if (targetRoomName !== this.roomName) { return false; } // Target not in the same room
        
        if (this.inRangeTo(target, range)) { return true; } // Target already in range
        
        let path = this.findPathTo(target, {algorithm: 'astar', ignoreRoads: true, range: range, ignoreCreeps: ignoreCreeps});
        
        if (!path.length) { return false; } // No path found
        
        return Game.rooms[this.roomName]
                   .getPositionAt(path[path.length - 1].x, path[path.length - 1].y)
                   .inRangeTo(target, range); // Last position of path is in range of the target
    };
};