6 files declare their use of NormalizerBase
- BooleanNormalizer.php in core/modules/ serialization/ tests/ modules/ test_datatype_boolean_emoji_normalizer/ src/ Normalizer/ BooleanNormalizer.php 
- NormalizerBase.php in core/modules/ jsonapi/ src/ Normalizer/ NormalizerBase.php 
- NormalizerBase.php in core/modules/ hal/ src/ Normalizer/ NormalizerBase.php 
- NormalizerBaseTest.php in core/modules/ serialization/ tests/ src/ Unit/ Normalizer/ NormalizerBaseTest.php 
- Contains \Drupal\Tests\serialization\Unit\Normalizer\NormalizerBaseTest.
- StringNormalizer.php in core/modules/ jsonapi/ tests/ modules/ jsonapi_test_data_type/ src/ Normalizer/ StringNormalizer.php 
- TraversableObjectNormalizer.php in core/modules/ jsonapi/ tests/ modules/ jsonapi_test_data_type/ src/ Normalizer/ TraversableObjectNormalizer.php 
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