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  1. import ResizeObserverPolyfill from './ResizeObserver.js';
  2. import global from './shims/global.js';
  3. export default (() => {
  4. // Export existing implementation if available.
  5. if (typeof global.ResizeObserver !== 'undefined') {
  6. return global.ResizeObserver;
  7. }
  8. return ResizeObserverPolyfill;
  9. })();