diff --git a/core/block.ts b/core/block.ts
index a321ad141..ca1ebd82c 100644
--- a/core/block.ts
+++ b/core/block.ts
@@ -33,7 +33,6 @@ import * as fieldRegistry from './field_registry.js';
 import {Input} from './inputs/input.js';
 import {Align} from './inputs/align.js';
 import type {IASTNodeLocation} from './interfaces/i_ast_node_location.js';
-import type {IDeletable} from './interfaces/i_deletable.js';
 import {type IIcon} from './interfaces/i_icon.js';
 import {isCommentIcon} from './interfaces/i_comment_icon.js';
 import type {MutatorIcon} from './icons/mutator_icon.js';
@@ -56,7 +55,7 @@ import {IconType} from './icons/icon_types.js';
  * Class for one block.
  * Not normally called directly, workspace.newBlock() is preferred.
  */
-export class Block implements IASTNodeLocation, IDeletable {
+export class Block implements IASTNodeLocation {
   /**
    * An optional callback method to use whenever the block's parent workspace
    * changes. This is usually only called from the constructor, the block type
@@ -318,7 +317,7 @@ export class Block implements IASTNodeLocation, IDeletable {
    *     statement with the previous statement.  Otherwise, dispose of all
    *     children of this block.
    */
-  dispose(healStack: boolean) {
+  dispose(healStack = false) {
     this.disposing = true;
 
     // Dispose of this change listener before unplugging.
diff --git a/core/block_svg.ts b/core/block_svg.ts
index 427436217..c7ab9289e 100644
--- a/core/block_svg.ts
+++ b/core/block_svg.ts
@@ -61,6 +61,7 @@ import * as renderManagement from './render_management.js';
 import {IconType} from './icons/icon_types.js';
 import {BlockCopyData, BlockPaster} from './clipboard/block_paster.js';
 import {BlockDragStrategy} from './dragging/block_drag_strategy.js';
+import {IDeletable} from './blockly.js';
 
 /**
  * Class for a block's SVG representation.
@@ -72,7 +73,8 @@ export class BlockSvg
     IASTNodeLocationSvg,
     IBoundedElement,
     ICopyable<BlockCopyData>,
-    IDraggable
+    IDraggable,
+    IDeletable
 {
   /**
    * Constant for identifying rows that are to be rendered inline.
diff --git a/core/blockly.ts b/core/blockly.ts
index 09db3c12c..678193f65 100644
--- a/core/blockly.ts
+++ b/core/blockly.ts
@@ -122,10 +122,10 @@ import {IConnectionChecker} from './interfaces/i_connection_checker.js';
 import {IConnectionPreviewer} from './interfaces/i_connection_previewer.js';
 import {IContextMenu} from './interfaces/i_contextmenu.js';
 import {ICopyable, isCopyable} from './interfaces/i_copyable.js';
-import {IDeletable} from './interfaces/i_deletable.js';
+import {IDeletable, isDeletable} from './interfaces/i_deletable.js';
 import {IDeleteArea} from './interfaces/i_delete_area.js';
 import {IDragTarget} from './interfaces/i_drag_target.js';
-import {IDraggable} from './interfaces/i_draggable.old.js';
+import {IDraggable, isDraggable} from './interfaces/i_draggable.js';
 import {IFlyout} from './interfaces/i_flyout.js';
 import {IHasBubble, hasBubble} from './interfaces/i_has_bubble.js';
 import {IIcon, isIcon} from './interfaces/i_icon.js';
@@ -136,7 +136,7 @@ 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';
+import {ISelectable, isSelectable} from './interfaces/i_selectable.js';
 import {ISelectableToolboxItem} from './interfaces/i_selectable_toolbox_item.js';
 import {ISerializable, isSerializable} from './interfaces/i_serializable.js';
 import {IStyleable} from './interfaces/i_styleable.js';
@@ -527,10 +527,10 @@ export {IConnectionPreviewer};
 export {IContextMenu};
 export {icons};
 export {ICopyable, isCopyable};
-export {IDeletable};
+export {IDeletable, isDeletable};
 export {IDeleteArea};
 export {IDragTarget};
-export {IDraggable};
+export {IDraggable, isDraggable};
 export {IFlyout};
 export {IHasBubble, hasBubble};
 export {IIcon, isIcon};
@@ -545,7 +545,7 @@ export {IObservable, isObservable};
 export {IPaster, isPaster};
 export {IPositionable};
 export {IRegistrable};
-export {ISelectable};
+export {ISelectable, isSelectable};
 export {ISelectableToolboxItem};
 export {ISerializable, isSerializable};
 export {IStyleable};
diff --git a/core/delete_area.ts b/core/delete_area.ts
index 6d30a434c..4967927c4 100644
--- a/core/delete_area.ts
+++ b/core/delete_area.ts
@@ -15,7 +15,8 @@
 import {BlockSvg} from './block_svg.js';
 import {DragTarget} from './drag_target.js';
 import type {IDeleteArea} from './interfaces/i_delete_area.js';
-import type {IDraggable} from './interfaces/i_draggable.old.js';
+import type {IDraggable} from './interfaces/i_draggable.js';
+import {isDeletable} from './interfaces/i_deletable.js';
 
 /**
  * Abstract class for a component that can delete a block or bubble that is
@@ -60,7 +61,7 @@ export class DeleteArea extends DragTarget implements IDeleteArea {
       const couldDeleteBlock = !block.getParent() && block.isDeletable();
       this.updateWouldDelete_(couldDeleteBlock);
     } else {
-      this.updateWouldDelete_(element.isDeletable());
+      this.updateWouldDelete_(isDeletable(element) && element.isDeletable());
     }
     return this.wouldDelete_;
   }
diff --git a/core/drag_target.ts b/core/drag_target.ts
index 37e04e645..e973f2dd1 100644
--- a/core/drag_target.ts
+++ b/core/drag_target.ts
@@ -13,7 +13,7 @@
 // Former goog.module ID: Blockly.DragTarget
 
 import type {IDragTarget} from './interfaces/i_drag_target.js';
-import type {IDraggable} from './interfaces/i_draggable.old.js';
+import type {IDraggable} from './interfaces/i_draggable.js';
 import type {Rect} from './utils/rect.js';
 
 /**
@@ -39,8 +39,9 @@ export class DragTarget implements IDragTarget {
    *
    * @param _dragElement The block or bubble currently being dragged.
    */
-  onDragEnter(_dragElement: IDraggable) {}
-  // no-op
+  onDragEnter(_dragElement: IDraggable) {
+    // no-op
+  }
 
   /**
    * Handles when a cursor with a block or bubble is dragged over this drag
@@ -48,24 +49,27 @@ export class DragTarget implements IDragTarget {
    *
    * @param _dragElement The block or bubble currently being dragged.
    */
-  onDragOver(_dragElement: IDraggable) {}
-  // no-op
+  onDragOver(_dragElement: IDraggable) {
+    // no-op
+  }
 
   /**
    * Handles when a cursor with a block or bubble exits this drag target.
    *
    * @param _dragElement The block or bubble currently being dragged.
    */
-  onDragExit(_dragElement: IDraggable) {}
-  // no-op
+  onDragExit(_dragElement: IDraggable) {
+    // no-op
+  }
   /**
    * Handles when a block or bubble is dropped on this component.
    * Should not handle delete here.
    *
    * @param _dragElement The block or bubble currently being dragged.
    */
-  onDrop(_dragElement: IDraggable) {}
-  // no-op
+  onDrop(_dragElement: IDraggable) {
+    // no-op
+  }
 
   /**
    * Returns the bounding rectangle of the drag target area in pixel units
diff --git a/core/dragging/dragger.ts b/core/dragging/dragger.ts
index ded1dda10..2be9ab1fd 100644
--- a/core/dragging/dragger.ts
+++ b/core/dragging/dragger.ts
@@ -43,7 +43,7 @@ export class Dragger implements IDragger {
     // Must check `wouldDelete` before calling other hooks on drag targets
     // since we have documented that we would do so.
     if (isDeletable(this.draggable)) {
-      (this.draggable as AnyDuringMigration).setDeleteStyle(
+      this.draggable.setDeleteStyle(
         this.wouldDeleteDraggable(e, this.draggable),
       );
     }
@@ -54,10 +54,10 @@ export class Dragger implements IDragger {
   protected updateDragTarget(e: PointerEvent) {
     const newDragTarget = this.workspace.getDragTarget(e);
     if (this.dragTarget !== newDragTarget) {
-      this.dragTarget?.onDragExit(this.draggable as AnyDuringMigration);
-      newDragTarget?.onDragEnter(this.draggable as AnyDuringMigration);
+      this.dragTarget?.onDragExit(this.draggable);
+      newDragTarget?.onDragEnter(this.draggable);
     }
-    newDragTarget?.onDragOver(this.draggable as AnyDuringMigration);
+    newDragTarget?.onDragOver(this.draggable);
     this.dragTarget = newDragTarget;
   }
 
@@ -96,7 +96,7 @@ export class Dragger implements IDragger {
   onDragEnd(e: PointerEvent) {
     const dragTarget = this.workspace.getDragTarget(e);
     if (dragTarget) {
-      this.dragTarget?.onDrop(this.draggable as AnyDuringMigration);
+      this.dragTarget?.onDrop(this.draggable);
     }
 
     if (this.shouldReturnToStart(e, this.draggable)) {
@@ -109,7 +109,7 @@ export class Dragger implements IDragger {
       isDeletable(this.draggable) &&
       this.wouldDeleteDraggable(e, this.draggable)
     ) {
-      (this.draggable as AnyDuringMigration).dispose();
+      this.draggable.dispose();
     }
   }
 
@@ -120,7 +120,7 @@ export class Dragger implements IDragger {
   protected shouldReturnToStart(e: PointerEvent, draggable: IDraggable) {
     const dragTarget = this.workspace.getDragTarget(e);
     if (!dragTarget) return false;
-    return dragTarget.shouldPreventMove(draggable as AnyDuringMigration);
+    return dragTarget.shouldPreventMove(draggable);
   }
 
   protected pixelsToWorkspaceUnits(pixelCoord: Coordinate): Coordinate {
diff --git a/core/interfaces/i_deletable.ts b/core/interfaces/i_deletable.ts
index 518d71baa..046770940 100644
--- a/core/interfaces/i_deletable.ts
+++ b/core/interfaces/i_deletable.ts
@@ -16,9 +16,19 @@ export interface IDeletable {
    * @returns True if deletable.
    */
   isDeletable(): boolean;
+
+  /** Disposes of this object, cleaning up any references or DOM elements. */
+  dispose(): void;
+
+  /** Visually indicates that the object is pending deletion. */
+  setDeleteStyle(wouldDelete: boolean): void;
 }
 
 /** Returns whether the given object is an IDeletable. */
 export function isDeletable(obj: any): obj is IDeletable {
-  return obj['isDeletable'] !== undefined;
+  return (
+    obj['isDeletable'] !== undefined &&
+    obj['dispose'] !== undefined &&
+    obj['setDeleteStyle'] !== undefined
+  );
 }
diff --git a/core/interfaces/i_delete_area.ts b/core/interfaces/i_delete_area.ts
index 6d4a6631d..86d2673bb 100644
--- a/core/interfaces/i_delete_area.ts
+++ b/core/interfaces/i_delete_area.ts
@@ -7,7 +7,7 @@
 // Former goog.module ID: Blockly.IDeleteArea
 
 import type {IDragTarget} from './i_drag_target.js';
-import type {IDraggable} from './i_draggable.old.js';
+import type {IDraggable} from './i_draggable.js';
 
 /**
  * Interface for a component that can delete a block or bubble that is dropped
diff --git a/core/interfaces/i_drag_target.ts b/core/interfaces/i_drag_target.ts
index d0bfecf53..3fa060232 100644
--- a/core/interfaces/i_drag_target.ts
+++ b/core/interfaces/i_drag_target.ts
@@ -6,7 +6,7 @@
 
 import {Rect} from '../utils/rect.js';
 
-import {IDraggable} from './i_draggable.old.js';
+import {IDraggable} from './i_draggable.js';
 
 // Former goog.module ID: Blockly.IDragTarget
 
diff --git a/core/interfaces/i_draggable.ts b/core/interfaces/i_draggable.ts
index 6f98e53c5..cb723e7b8 100644
--- a/core/interfaces/i_draggable.ts
+++ b/core/interfaces/i_draggable.ts
@@ -58,3 +58,15 @@ export interface IDragStrategy {
   /** Moves the draggable back to where it was at the start of the drag. */
   revertDrag(): void;
 }
+
+/** Returns whether the given object is an IDraggable or not. */
+export function isDraggable(obj: any): obj is IDraggable {
+  return (
+    obj.getRelativeToSurfaceXY !== undefined &&
+    obj.isMovable !== undefined &&
+    obj.startDrag !== undefined &&
+    obj.drag !== undefined &&
+    obj.endDrag !== undefined &&
+    obj.revertDrag !== undefined
+  );
+}
diff --git a/core/interfaces/i_selectable.ts b/core/interfaces/i_selectable.ts
index cda47c7cd..8090ad94a 100644
--- a/core/interfaces/i_selectable.ts
+++ b/core/interfaces/i_selectable.ts
@@ -6,13 +6,10 @@
 
 // Former goog.module ID: Blockly.ISelectable
 
-import type {IDeletable} from './i_deletable.js';
-import type {IMovable} from './i_movable.js';
-
 /**
  * The interface for an object that is selectable.
  */
-export interface ISelectable extends IDeletable, IMovable {
+export interface ISelectable {
   id: string;
 
   /** Select this.  Highlight it visually. */
@@ -21,3 +18,12 @@ export interface ISelectable extends IDeletable, IMovable {
   /** Unselect this.  Unhighlight it visually. */
   unselect(): void;
 }
+
+/** Checks whether the given object is an ISelectable. */
+export function isSelectable(obj: Object): obj is ISelectable {
+  return (
+    typeof (obj as any).id === 'string' &&
+    (obj as any).select !== undefined &&
+    (obj as any).unselect !== undefined
+  );
+}
diff --git a/core/shortcut_items.ts b/core/shortcut_items.ts
index 57b90a498..76e11dcd7 100644
--- a/core/shortcut_items.ts
+++ b/core/shortcut_items.ts
@@ -11,9 +11,11 @@ import * as clipboard from './clipboard.js';
 import * as common from './common.js';
 import {Gesture} from './gesture.js';
 import {ICopyData, isCopyable} from './interfaces/i_copyable.js';
+import {isDeletable} from './interfaces/i_deletable.js';
 import {KeyboardShortcut, ShortcutRegistry} from './shortcut_registry.js';
 import {KeyCodes} from './utils/keycodes.js';
 import type {WorkspaceSvg} from './workspace_svg.js';
+import {isDraggable} from './interfaces/i_draggable.js';
 
 /**
  * Object holding the names of the default shortcut items.
@@ -59,6 +61,7 @@ export function registerDelete() {
       return (
         !workspace.options.readOnly &&
         selected != null &&
+        isDeletable(selected) &&
         selected.isDeletable()
       );
     },
@@ -105,7 +108,9 @@ export function registerCopy() {
         !workspace.options.readOnly &&
         !Gesture.inProgress() &&
         selected != null &&
+        isDeletable(selected) &&
         selected.isDeletable() &&
+        isDraggable(selected) &&
         selected.isMovable() &&
         isCopyable(selected)
       );
diff --git a/core/toolbox/toolbox.ts b/core/toolbox/toolbox.ts
index e49d0b9c4..e0fb62e23 100644
--- a/core/toolbox/toolbox.ts
+++ b/core/toolbox/toolbox.ts
@@ -24,7 +24,7 @@ import {DeleteArea} from '../delete_area.js';
 import * as eventUtils from '../events/utils.js';
 import type {IAutoHideable} from '../interfaces/i_autohideable.js';
 import type {ICollapsibleToolboxItem} from '../interfaces/i_collapsible_toolbox_item.js';
-import type {IDraggable} from '../interfaces/i_draggable.old.js';
+import type {IDraggable} from '../interfaces/i_draggable.js';
 import type {IFlyout} from '../interfaces/i_flyout.js';
 import type {IKeyboardAccessible} from '../interfaces/i_keyboard_accessible.js';
 import type {ISelectableToolboxItem} from '../interfaces/i_selectable_toolbox_item.js';
@@ -41,9 +41,9 @@ import * as dom from '../utils/dom.js';
 import {Rect} from '../utils/rect.js';
 import * as toolbox from '../utils/toolbox.js';
 import type {WorkspaceSvg} from '../workspace_svg.js';
-
 import type {ToolboxCategory} from './category.js';
 import {CollapsibleToolboxCategory} from './collapsible_category.js';
+import {isDeletable} from '../interfaces/i_deletable.js';
 
 /**
  * Class for a Toolbox.
@@ -540,7 +540,7 @@ export class Toolbox
       const block = element;
       this.updateWouldDelete_(!block.getParent() && block.isDeletable());
     } else {
-      this.updateWouldDelete_(element.isDeletable());
+      this.updateWouldDelete_(isDeletable(element) && element.isDeletable());
     }
     return this.wouldDelete_;
   }
diff --git a/core/trashcan.ts b/core/trashcan.ts
index c89262263..b48777c4d 100644
--- a/core/trashcan.ts
+++ b/core/trashcan.ts
@@ -22,7 +22,7 @@ import type {Abstract} from './events/events_abstract.js';
 import type {BlockDelete} from './events/events_block_delete.js';
 import * as eventUtils from './events/utils.js';
 import type {IAutoHideable} from './interfaces/i_autohideable.js';
-import type {IDraggable} from './interfaces/i_draggable.old.js';
+import type {IDraggable} from './interfaces/i_draggable.js';
 import type {IFlyout} from './interfaces/i_flyout.js';
 import type {IPositionable} from './interfaces/i_positionable.js';
 import type {UiMetrics} from './metrics_manager.js';