tmp

index.js

function addBlockedRoomsToMatrix(theRoom)
{
    console.log(theRoom)
        var theMatrix = new PathFinder.CostMatrix

    {
        var exits = Game.map.describeExits(theRoom);
        for(var ext in exits)
        {
            var room = exits[ext];
            if((room) == 'E1N18')
            {
                console.log('Adding blocked edge for direction ' + ext  + " towards " + room,'matrix');
                blockRoomForPathfinder(theMatrix, Number(ext));
            }
        }
    }
    return theMatrix;

}

function blockRoomForPathfinder(theMatrix, theDirection)
{
    for (var ii = 0; ii <= 49; ii++) 
    {
        if (theDirection == TOP) {
          theMatrix.set(ii, 0, 0xff);
        }
        if (theDirection ==  RIGHT) {
          theMatrix.set(49, ii, 0xff);
        }
        if (theDirection == BOTTOM) {
          theMatrix.set(ii, 49, 0xff);
        }
        if (theDirection ==  LEFT) {
          theMatrix.set(0, ii, 0xff);
        }
      }
}
console.log(
    PathFinder.search(new RoomPosition(15,20, 'E2N19'), new RoomPosition(26, 27, 'E1N16'), {
        roomCallback: addBlockedRoomsToMatrix,
    }).path
)