pub suberror MetadataError {
  InvalidWgslDirective(String, Int, String)
  ImportParseError(String, Int)
  DefineInModule(Int)
}

fn collect_wgsl_source_local_shader_defines(source : String) -> Map[String, 
@Milky2018/moon_wgsl_naga_oil/contract.ShaderDefValue
ShaderDefValue]

fn get_preprocessor_metadata(source : String, allow_defines? : Bool, collect_import_uses? : Bool) -> 
@Milky2018/moon_wgsl_naga_oil/contract.PreprocessorMetaData
PreprocessorMetaData raise MetadataError

fn wgsl_source_define_import_path(source : String) -> String?