class_docstr: Resolves the environment within which assets should be loaded.
  
  Assets can have varying metadata depending on the environment that they are
  loaded in due to regulatory or technical requirements.
class_docstr_tok: ["Resolves","the","environment","within","which","assets","should","be","loaded",".","Assets","can","have","varying","metadata","depending","on","the","environment","that","they","are","loaded","in","due","to","regulatory","or","technical","requirements","."]
code: def __call__(self) -> Optional[str]:
      ...
  
imports: from __future__ import annotations
  import os
  from abc import ABC, abstractmethod
  from pathlib import Path
  from typing import Any, Dict, List, Optional, Protocol, final
  from fairseq2.assets.card import AssetCard, AssetCardError
  from fairseq2.assets.metadata_provider import AssetMetadataProvider, AssetNotFoundError, FileAssetMetadataProvider
  from fairseq2.assets.utils import _get_path_from_env
  from fairseq2.typing import finaloverride
label_desc: Use image node_id 1 for calling the EnvironmentResolver obj's underlying member method code with example usage: obj.__call__() without return types