14 files declare their use of SimpleSitemap in Simple XML sitemap 4.x

CustomLinksForm.php in src/Form/CustomLinksForm.php

FormHelper.php in src/Form/FormHelper.php

Generator.php in src/Manager/Generator.php

QueueWorker.php in src/Queue/QueueWorker.php

SettingsForm.php in src/Form/SettingsForm.php

SimpleSitemapCommands.php in src/Commands/SimpleSitemapCommands.php

SimpleSitemapDisplayExtender.php in modules/simple_sitemap_views/src/Plugin/views/display_extender/SimpleSitemapDisplayExtender.php

SimplesitemapEnginesForm.php in modules/simple_sitemap_engines/src/Form/SimplesitemapEnginesForm.php

SimpleSitemapListBuilder.php in src/SimpleSitemapListBuilder.php

SimplesitemapTest.php in tests/src/Functional/SimplesitemapTest.php

SimpleSitemapViews.php in modules/simple_sitemap_views/src/SimpleSitemapViews.php

simple_sitemap.module in ./simple_sitemap.module

Main module file containing hooks.

SitemapSubmitter.php in modules/simple_sitemap_engines/src/Plugin/QueueWorker/SitemapSubmitter.php

VariantSetterTrait.php in src/Manager/VariantSetterTrait.php