11 files declare their use of FacetsSummaryInterface in Facets 8

BuildProcessorInterface.php in modules/facets_summary/src/Processor/BuildProcessorInterface.php

DefaultFacetsSummaryManager.php in modules/facets_summary/src/FacetsSummaryManager/DefaultFacetsSummaryManager.php

FacetListBuilder.php in src/FacetListBuilder.php

FacetsSummary.php in modules/facets_summary/src/Entity/FacetsSummary.php

HideWhenNotRenderedProcessor.php in modules/facets_summary/src/Plugin/facets_summary/processor/HideWhenNotRenderedProcessor.php

ProcessorInterface.php in modules/facets_summary/src/Processor/ProcessorInterface.php

ProcessorPluginBase.php in modules/facets_summary/src/Processor/ProcessorPluginBase.php

ResetFacetsProcessor.php in modules/facets_summary/src/Plugin/facets_summary/processor/ResetFacetsProcessor.php

ShowCountProcessor.php in modules/facets_summary/src/Plugin/facets_summary/processor/ShowCountProcessor.php

ShowSummaryProcessor.php in modules/facets_summary/src/Plugin/facets_summary/processor/ShowSummaryProcessor.php

ShowTextWhenEmptyProcessor.php in modules/facets_summary/src/Plugin/facets_summary/processor/ShowTextWhenEmptyProcessor.php