10 files declare their use of ExportEntityWriter in Content Synchronizer 3.x

ArchiveDownloader.php in src/Service/ArchiveDownloader.php

ArchiveDownloaderController.php in src/Controller/ArchiveDownloaderController.php

ContentSynchronizerManager.php in src/Service/ContentSynchronizerManager.php

EntityProcessorBase.php in src/Processors/Entity/EntityProcessorBase.php

ExportConfirmForm.php in src/Form/ExportConfirmForm.php

FileFieldItemListProcessor.php in src/Plugin/content_synchronizer/type_processor/FileFieldItemListProcessor.php

ImportEntity.php in src/Entity/ImportEntity.php

LaunchExportForm.php in src/Form/LaunchExportForm.php

QuickExportController.php in src/Controller/QuickExportController.php

TaxonomyTermProcessor.php in src/Plugin/content_synchronizer/entity_processor/TaxonomyTermProcessor.php