Function extendAdapter

packages/ai/src/extend-adapter.ts:253–261

(
  factory: AnyAdapterFactory,
  _customModels: ReadonlyArray<ExtendedModelDef>,
)

// The implementation signature stays at the honest `AnyAdapterFactory` width;
// the overload above performs the deliberate model-union widening.
export function extendAdapter(
  factory: AnyAdapterFactory,
  _customModels: ReadonlyArray<ExtendedModelDef>,
): AnyAdapterFactory {
  // At runtime, we simply pass through to the original factory.
  // The _customModels parameter is only used for type inference.
  // No runtime validation - users are trusted to pass valid model names.
  return factory
}