16 files declare their use of ProductInterface in Commerce Core 8.2

CartBrowserTestTrait.php in modules/cart/tests/src/Traits/CartBrowserTestTrait.php

ComputedDefaultVariation.php in modules/product/src/Plugin/Field/ComputedDefaultVariation.php

FilterVariationsEvent.php in modules/product/src/Event/FilterVariationsEvent.php

OrderItemProductCategoryTest.php in modules/product/tests/src/Unit/Plugin/Commerce/Condition/OrderItemProductCategoryTest.php

OrderItemProductTypeTest.php in modules/product/tests/src/Unit/Plugin/Commerce/Condition/OrderItemProductTypeTest.php

OrderProductCategoryTest.php in modules/product/tests/src/Unit/Plugin/Commerce/Condition/OrderProductCategoryTest.php

OrderProductTypeTest.php in modules/product/tests/src/Unit/Plugin/Commerce/Condition/OrderProductTypeTest.php

Product.php in modules/product/src/Plugin/views/argument_default/Product.php

ProductCategoryTrait.php in modules/product/src/Plugin/Commerce/Condition/ProductCategoryTrait.php

ProductDefaultVariationEvent.php in modules/product/src/Event/ProductDefaultVariationEvent.php

ProductDefaultVariationEventTest.php in modules/product/tests/src/Kernel/ProductDefaultVariationEventTest.php

ProductEvent.php in modules/product/src/Event/ProductEvent.php

ProductVariationContext.php in modules/product/src/ContextProvider/ProductVariationContext.php

ProductVariationStorage.php in modules/product/src/ProductVariationStorage.php

ProductVariationStorageInterface.php in modules/product/src/ProductVariationStorageInterface.php

ProductVariationWidgetBase.php in modules/product/src/Plugin/Field/FieldWidget/ProductVariationWidgetBase.php