silphius/public/assets/tomato-seeds/projection-check.js

const layer = ecs.get(1).TileLayers.layer(1)
const {tileSize} = layer;

const filtered = []

for (const position of projected) {
  const x0 = position.x * tileSize.x;
  const y0 = position.y * tileSize.y;
  const entities = ecs.system('MaintainColliderHash').within({
    x0,
    x1: x0 + tileSize.x - 1,
    y0,
    y1: y0 + tileSize.y - 1,
  });
  let hasPlant = false;
  for (const {Plant} of entities) {
    if (Plant) {
      hasPlant = true
      break;
    }
  }
  if (!hasPlant) {
    if ([7].includes(layer.tile(position))) {
      filtered.push(position)
    }
  }
}

filtered