function findTileMetadata(tileset, tileHeader) {
  const metadataJson = hasExtension(tileHeader, "3DTILES_metadata")
    ? tileHeader.extensions["3DTILES_metadata"]
    : tileHeader.metadata;

  if (!defined(metadataJson)) {
    return undefined;
  }

  if (!defined(tileset.schema)) {
    findTileMetadata._oneTimeWarning(
      "findTileMetadata-missing-root-schema",
      "Could not find a metadata schema for tile metadata. For tilesets that contain external tilesets, make sure the schema is added to the root tileset.json.",
    );
    return undefined;
  }

  const classes = tileset.schema.classes ?? Frozen.EMPTY_OBJECT;
  if (defined(metadataJson.class)) {
    const tileClass = classes[metadataJson.class];
    return new TileMetadata({
      tile: metadataJson,
      class: tileClass,
    });
  }

  return undefined;
}
Check if a tile has metadata, either defined in its metadata field (3D Tiles 1.1)
or in the <code>3DTILES_metadata</code> extension. If defined, get the tile metadata
with the corresponding class.
<p>
This assumes that tileset.metadata has been created before any tiles are constructed.
</p>
@function

@param {Cesium3DTileset} tileset The tileset to query for tile metadata
@param {object} tileHeader the JSON header for a {@link Cesium3DTile}
@return {TileMetadata} the tile metadata, or <code>undefined</code> if not found
@private
@experimental This feature is using part of the 3D Tiles spec that is not final and is subject to change without Cesium's standard deprecation policy.