chore: rearrange serialization export to make APIExtractor happy (#6480)

* chore: rearrange serialization export to make APIExtractor happy

* chore: format

core/blockly.ts

@@ -104,7 +104,6 @@ import {IRegistrable} from './interfaces/i_registrable.js';
 import {IRegistrableField} from './interfaces/i_registrable_field.js';
 import {ISelectable} from './interfaces/i_selectable.js';
 import {ISelectableToolboxItem} from './interfaces/i_selectable_toolbox_item.js';
-import {ISerializer as SerializerInterface} from './interfaces/i_serializer.js';
 import {IStyleable} from './interfaces/i_styleable.js';
 import {IToolbox} from './interfaces/i_toolbox.js';
 import {IToolboxItem} from './interfaces/i_toolbox_item.js';
@@ -134,12 +133,7 @@ import * as thrasos from './renderers/thrasos/thrasos.js';
 import * as zelos from './renderers/zelos/zelos.js';
 import {Scrollbar} from './scrollbar.js';
 import {ScrollbarPair} from './scrollbar_pair.js';
-import * as serializationBlocks from './serialization/blocks.js';
-import * as serializationExceptions from './serialization/exceptions.js';
-import * as serializationPriorities from './serialization/priorities.js';
-import * as serializationRegistry from './serialization/registry.js';
-import * as serializationVariables from './serialization/variables.js';
-import * as serializationWorkspaces from './serialization/workspaces.js';
+import * as serialization from './serialization.js';
 import * as ShortcutItems from './shortcut_items.js';
 import {ShortcutRegistry} from './shortcut_registry.js';
 import {Theme} from './theme.js';
@@ -157,7 +151,6 @@ import {Trashcan} from './trashcan.js';
 import * as utils from './utils.js';
 import * as colour from './utils/colour.js';
 import * as deprecation from './utils/deprecation.js';
-import * as svgMath from './utils/svg_math.js';
 import * as toolbox from './utils/toolbox.js';
 import {VariableMap} from './variable_map.js';
 import {VariableModel} from './variable_model.js';
@@ -743,12 +736,4 @@ export {config};
 export const connectionTypes = ConnectionType;
 export {inject};
 export {inputTypes};
-export namespace serialization {
-  export const blocks = serializationBlocks;
-  export const exceptions = serializationExceptions;
-  export const priorities = serializationPriorities;
-  export const registry = serializationRegistry;
-  export const variables = serializationVariables;
-  export const workspaces = serializationWorkspaces;
-  export type ISerializer = SerializerInterface;
-}
+export {serialization};

core/serialization.ts

@@ -0,0 +1,29 @@
+/**
+ * @license
+ * Copyright 2022 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * Serialization methods.
+ */
+import * as goog from '../closure/goog/goog.js';
+goog.declareModuleId('Blockly.serialization');
+
+import * as blocks from './serialization/blocks.js';
+import * as exceptions from './serialization/exceptions.js';
+import * as priorities from './serialization/priorities.js';
+import * as registry from './serialization/registry.js';
+import * as variables from './serialization/variables.js';
+import * as workspaces from './serialization/workspaces.js';
+import {ISerializer} from './interfaces/i_serializer.js';
+
+export {
+  blocks,
+  exceptions,
+  priorities,
+  registry,
+  variables,
+  workspaces,
+  ISerializer,
+};