MultiplayerMinesweeper/scripts/world/marker.mjs

const searchLoc =
[
  [-1,1], [0,1], [1,1],
  [-1,0],        [1,0],
  [-1,-1],[0,-1],[1,-1]
]
// Place Numbers
export function mark(world) {

for(let x = 0; x < world.width; x++){
  for(let y = 0; y < world.height; y++){
    if (world.data[x][y].type === 1) {
    var counter = 0;
    searchLoc.forEach(location => {
      const tempx = x + location[0]
      const tempy = y + location[1]
      if (tempx >= 0 && tempy >= 0 && tempx < world.width && tempy < world.height) {
        if (world.data[tempx][tempy].type === 5) {
          counter++;
        }
      }
    });
    if (counter !== 0) {
    world.data[x][y].type = 15 + counter
    }
    }
  }
}
  world.isMarked = true;
  return world;

}