1. /**
    
  2.  * Copyright (c) Meta Platforms, Inc. and affiliates.
    
  3.  *
    
  4.  * This source code is licensed under the MIT license found in the
    
  5.  * LICENSE file in the root directory of this source tree.
    
  6.  *
    
  7.  * @flow
    
  8.  */
    
  9. 
    
  10. export opaque type CrossOriginString: string = string;
    
  11. 
    
  12. export function getCrossOriginString(input: ?string): ?CrossOriginString {
    
  13.   if (typeof input === 'string') {
    
  14.     return input === 'use-credentials' ? input : '';
    
  15.   }
    
  16.   return undefined;
    
  17. }
    
  18. 
    
  19. export function getCrossOriginStringAs(
    
  20.   as: ?string,
    
  21.   input: ?string,
    
  22. ): ?CrossOriginString {
    
  23.   if (as === 'font') {
    
  24.     return '';
    
  25.   }
    
  26.   if (typeof input === 'string') {
    
  27.     return input === 'use-credentials' ? input : '';
    
  28.   }
    
  29.   return undefined;
    
  30. }