Function getKeysToRender

src/utils.js:187–200

(targetKey, tiles, maxZoom)

}

export const getKeysToRender = (targetKey, tiles, maxZoom) => {
  const ancestor = getAncestorToRender(targetKey, tiles)

  if (ancestor) {
    return [ancestor]
  }

  const descendants = getDescendantsToRender(targetKey, tiles, maxZoom)
  if (descendants.length) {
    return descendants
  }

  return [targetKey]
}

export const getAncestorToRender = (targetKey, tiles) => {
  let [x, y, z] = keyToTile(targetKey)