chore: fix paster exports and registration

core/blockly.ts

@@ -152,6 +152,7 @@ import {IKeyboardAccessible} from './interfaces/i_keyboard_accessible.js';
 import {IMetricsManager} from './interfaces/i_metrics_manager.js';
 import {IMovable} from './interfaces/i_movable.js';
 import {IObservable, isObservable} from './interfaces/i_observable.js';
+import {IPaster, isPaster} from './interfaces/i_paster.js';
 import {IPositionable} from './interfaces/i_positionable.js';
 import {IRegistrable} from './interfaces/i_registrable.js';
 import {ISelectable} from './interfaces/i_selectable.js';
@@ -606,6 +607,7 @@ export {Input};
 export {inputs};
 export {InsertionMarkerManager};
 export {IObservable, isObservable};
+export {IPaster, isPaster};
 export {IPositionable};
 export {IRegistrable};
 export {ISelectable};

core/clipboard.ts

@@ -8,6 +8,8 @@ import * as goog from '../closure/goog/goog.js';
 goog.declareModuleId('Blockly.clipboard');
 
 import type {CopyData, ICopyable} from './interfaces/i_copyable.js';
+import {BlockPaster} from './clipboard/block_paster.js';
+import * as registry from './clipboard/registry.js';
 
 /** Metadata about the object that is currently on the clipboard. */
 let copyData: CopyData | null = null;
@@ -82,3 +84,5 @@ export const TEST_ONLY = {
   duplicateInternal,
   copyInternal,
 };
+
+export {BlockPaster, registry};

core/clipboard/block_paster.ts

@@ -5,13 +5,16 @@
  */
 
 import {BlockSvg} from '../block_svg.js';
-import {CopyData} from '../interfaces/i_copyable';
+import {registry} from '../clipboard.js';
+import {CopyData} from '../interfaces/i_copyable.js';
 import {IPaster} from '../interfaces/i_paster.js';
-import {State, append} from '../serialization/blocks';
+import {State, append} from '../serialization/blocks.js';
 import {Coordinate} from '../utils/coordinate.js';
 import {WorkspaceSvg} from '../workspace_svg.js';
 
 export class BlockPaster implements IPaster<BlockCopyData, BlockSvg> {
+  static TYPE = 'block';
+
   paste(
     copyData: BlockCopyData,
     workspace: WorkspaceSvg,
@@ -29,3 +32,5 @@ export class BlockPaster implements IPaster<BlockCopyData, BlockSvg> {
 }
 
 export interface BlockCopyData extends CopyData {}
+
+registry.register(BlockPaster.TYPE, new BlockPaster());

core/clipboard/registry.ts

@@ -0,0 +1,31 @@
+/**
+ * @license
+ * Copyright 2023 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import {ICopyable, CopyData} from '../interfaces/i_copyable.js';
+import type {IPaster} from '../interfaces/i_paster.js';
+import * as registry from '../registry.js';
+
+/**
+ * Registers the given paster so that it cna be used for pasting.
+ *
+ * @param type The type of the paster to register, e.g. 'block', 'comment', etc.
+ * @param paster The paster to register.
+ */
+export function register<U extends CopyData, T extends ICopyable>(
+  type: string,
+  paster: IPaster<U, T>,
+) {
+  registry.register(registry.Type.PASTER, type, paster);
+}
+
+/**
+ * Unregisters the paster associated with the given type.
+ *
+ * @param type The type of the paster to unregister.
+ */
+export function unregister(type: string) {
+  registry.unregister(registry.Type.PASTER, type);
+}

core/clipboard/workspace_comment_paster.ts

@@ -9,10 +9,13 @@ import {CopyData} from '../interfaces/i_copyable.js';
 import {Coordinate} from '../utils/coordinate.js';
 import {WorkspaceSvg} from '../workspace_svg.js';
 import {WorkspaceCommentSvg} from '../workspace_comment_svg.js';
+import {registry} from '../clipboard.js';
 
 export class WorkspaceCommentPaster
   implements IPaster<WorkspaceCommentCopyData, WorkspaceCommentSvg>
 {
+  static TYPE = 'workspace-comment';
+
   paste(
     copyData: WorkspaceCommentCopyData,
     workspace: WorkspaceSvg,
@@ -28,3 +31,5 @@ export class WorkspaceCommentPaster
 }
 
 export interface WorkspaceCommentCopyData extends CopyData {}
+
+registry.register(WorkspaceCommentPaster.TYPE, new WorkspaceCommentPaster());

core/registry.ts

@@ -22,6 +22,8 @@ import type {Options} from './options.js';
 import type {Renderer} from './renderers/common/renderer.js';
 import type {Theme} from './theme.js';
 import type {ToolboxItem} from './toolbox/toolbox_item.js';
+import {IPaster} from './interfaces/i_paster.js';
+import {CopyData, ICopyable} from './interfaces/i_copyable.js';
 
 /**
  * A map of maps. With the keys being the type and name of the class we are
@@ -96,6 +98,9 @@ export class Type<_T> {
 
   /** @internal */
   static ICON = new Type<IIcon>('icon');
+
+  /** @internal */
+  static PASTER = new Type<IPaster<CopyData, ICopyable>>('paster');
 }
 
 /**