11 files declare their use of FieldDiffBuilderBase in Diff 8

CommentFieldBuilder.php in src/Plugin/diff/Field/CommentFieldBuilder.php

CoreFieldBuilder.php in src/Plugin/diff/Field/CoreFieldBuilder.php

EntityReferenceFieldBuilder.php in src/Plugin/diff/Field/EntityReferenceFieldBuilder.php

FileFieldBuilder.php in src/Plugin/diff/Field/FileFieldBuilder.php

ImageFieldBuilder.php in src/Plugin/diff/Field/ImageFieldBuilder.php

LinkFieldBuilder.php in src/Plugin/diff/Field/LinkFieldBuilder.php

ListFieldBuilder.php in src/Plugin/diff/Field/ListFieldBuilder.php

TestHeavierTextPlugin.php in tests/modules/diff_test/src/Plugin/diff/Field/TestHeavierTextPlugin.php

TestLighterTextPlugin.php in tests/modules/diff_test/src/Plugin/diff/Field/TestLighterTextPlugin.php

TextFieldBuilder.php in src/Plugin/diff/Field/TextFieldBuilder.php

TextWithSummaryFieldBuilder.php in src/Plugin/diff/Field/TextWithSummaryFieldBuilder.php