guard pending-changes.guard.ts

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  import { CanDeactivateFn } from '@angular/router';
 
export interface HasChanges {
  saveChanges: () => Promise<boolean> | boolean;
}
 
export const pendingChangesGuard: CanDeactivateFn<HasChanges> = async (component, currentRoute, currentState, nextState) => {
  if (!component?.saveChanges || await component.saveChanges()) return true;
  return confirm($localize`Discard draft?`);
};