code: func GetImportFunc(ctx context.Context) store.ImportCallback {
  	imf, ok := ctx.Value(ctxKeyImportFunc).(store.ImportCallback)
  	if !ok || imf == nil {
  		return func(context.Context, string, []string) bool {
  			return true
  		}
  	}
  	return imf
  }
docs: // GetImportFunc will return the import callback or a default one returning true
  // Note: will never return nil