diff --git a/src/keras_format/constraint_config.ts b/src/keras_format/constraint_config.ts
index 01ee061a4..c0091fa60 100644
--- a/src/keras_format/constraint_config.ts
+++ b/src/keras_format/constraint_config.ts
@@ -38,3 +38,5 @@ export type MinMaxNormSerialization =
 
 export type ConstraintSerialization = MaxNormSerialization|NonNegSerialization|
     UnitNormSerialization|MinMaxNormSerialization;
+
+export type ConstraintClassName = ConstraintSerialization['class_name'];
diff --git a/src/keras_format/initializer_config.ts b/src/keras_format/initializer_config.ts
index 17415cb19..bf3697bdf 100644
--- a/src/keras_format/initializer_config.ts
+++ b/src/keras_format/initializer_config.ts
@@ -92,3 +92,5 @@ export type InitializerSerialization = ZerosSerialization|OnesSerialization|
     ConstantSerialization|RandomUniformSerialization|RandomNormalSerialization|
     TruncatedNormalSerialization|IdentitySerialization|
     VarianceScalingSerialization|OrthogonalSerialization;
+
+export type InitializerClassName = InitializerSerialization['class_name'];
diff --git a/src/keras_format/keras_class_names.ts b/src/keras_format/keras_class_names.ts
new file mode 100644
index 000000000..7258a8f85
--- /dev/null
+++ b/src/keras_format/keras_class_names.ts
@@ -0,0 +1,22 @@
+/**
+ * @license
+ * Copyright 2018 Google LLC
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ * =============================================================================
+ */
+
+import {ConstraintClassName} from './constraint_config';
+import {InitializerClassName} from './initializer_config';
+import {LayerClassName} from './layers/layer_serialization';
+import {RegularizerClassName} from './regularizer_config';
+
+/**
+ * A type representing all valid values of `class_name` in a Keras JSON file
+ * (regardless of context, which will naturally further restrict the valid
+ * values).
+ */
+export type KerasClassName = LayerClassName|ConstraintClassName|
+    InitializerClassName|RegularizerClassName;
diff --git a/src/keras_format/layers/pooling_serialization.ts b/src/keras_format/layers/pooling_serialization.ts
index 4aa183566..6830ab3f9 100644
--- a/src/keras_format/layers/pooling_serialization.ts
+++ b/src/keras_format/layers/pooling_serialization.ts
@@ -59,4 +59,3 @@ export type PoolingLayerSerialization = MaxPooling1DLayerSerialization|
     GlobalMaxPooling1DLayerSerialization|
     GlobalAveragePooling2DLayerSerialization|
     GlobalMaxPooling2DLayerSerialization;
-;
diff --git a/src/keras_format/regularizer_config.ts b/src/keras_format/regularizer_config.ts
index f889c948d..7371e66ff 100644
--- a/src/keras_format/regularizer_config.ts
+++ b/src/keras_format/regularizer_config.ts
@@ -31,3 +31,5 @@ export type L2Serialization = BaseSerialization<'L2', L2Config>;
 
 export type RegularizerSerialization =
     L1L2Serialization|L1Serialization|L2Serialization;
+
+export type RegularizerClassName = RegularizerSerialization['class_name'];