TypeCellOS · nperez0111 · Aug 21, 2026
diff --git a/packages/core/src/api/blockManipulation/commands/replaceBlocks/util/fixColumnList.ts b/packages/core/src/api/blockManipulation/commands/replaceBlocks/util/fixColumnList.ts
diff --git a/packages/core/src/api/blockManipulation/containers/containerUI.ts b/packages/core/src/api/blockManipulation/containers/containerUI.ts
@@ -40,21 +40,14 @@ export function getContainerUIInfo(
   )) {
     const draggable = spec.implementation?.meta?.draggable !== false;
 
-    // Legacy: `@blocknote/xl-multi-column`'s hand-written specs, which have
-    // no `children` config. Removed once multi-column is migrated onto the
-    // container API.
-    const isLegacyColumnType = type === "columnList" || type === "column";
-
-    if (!isContainerType(spec.config) && !isLegacyColumnType) {
+    if (!isContainerType(spec.config)) {
       if (!draggable) {
         nonDraggableBlockTypes.add(type);
       }
       continue;
     }
     containerTypes.add(type);
-    // Legacy column nodes are never draggable themselves; only the blocks
-    // inside them are (matching the pre-container side menu behavior).
-    if (draggable && !isLegacyColumnType) {
+    if (draggable) {
       draggableContainerTypes.add(type);
     }
   }

diff --git a/packages/core/src/api/blockManipulation/containers/fixContainer.ts b/packages/core/src/api/blockManipulation/containers/fixContainer.ts
@@ -14,7 +14,6 @@ import {
 import type { ResolvedChildren } from "../../../schema/blocks/children.js";
 import { seedRefillChildren } from "../../nodeConversions/blockToNode.js";
 import { getNodeById } from "../../nodeUtil.js";
-import { fixColumnList } from "../commands/replaceBlocks/util/fixColumnList.js";
 
 // Defined in `children.ts` (it answers a schema-level question); re-exported
 // here because the public root export (`index.ts`) imports it from this
@@ -149,12 +148,6 @@ export function fixContainer(tr: Transaction, containerPos: number) {
   const config = childrenConfig ? resolveChildren(childrenConfig) : undefined;
 
   if (!config) {
-    // Legacy repair for `@blocknote/xl-multi-column`'s hand-written PM nodes,
-    // which have no `children` config but sit in the `childContainer` group.
-    // Removed once multi-column is migrated onto the container API.
-    if (target.blockNode.type.name === "columnList") {
-      fixColumnList(tr, target.blockPos);
-    }
     return;
   }
 

diff --git a/packages/core/src/api/exporters/html/util/serializeBlocksInternalHTML.ts b/packages/core/src/api/exporters/html/util/serializeBlocksInternalHTML.ts
@@ -256,20 +256,6 @@ function serializeBlock<
     return ret.dom;
   }
 
-  // Legacy path for `@blocknote/xl-multi-column`'s hand-written PM nodes,
-  // which sit in the `bnBlock` group but have no `children` config. They own
-  // their outer DOM and hold their children directly in their `contentDOM`.
-  // Removed once multi-column is migrated onto the container API.
-  const pmType = editor.pmSchema.nodes[block.type!];
-  if (pmType?.isInGroup("bnBlock")) {
-    if (block.children && block.children.length > 0) {
-      ret.contentDOM?.append(
-        serializeBlocks(editor, block.children, serializer, options),
-      );
-    }
-    return ret.dom;
-  }
-
   // wrap the block in a blockContainer
   const bc = BC_NODE.spec?.toDOM?.(
     BC_NODE.create({

diff --git a/packages/core/src/api/nodeConversions/blockToNode.ts b/packages/core/src/api/nodeConversions/blockToNode.ts
@@ -601,22 +601,6 @@ export function blockToNode(
         childrenNode,
       ]),
     );
-  } else if (
-    schema.nodes[block.type].isInGroup("bnBlock") &&
-    !getChildrenConfig(schema.nodes[block.type].spec.blockConfig ?? {})
-  ) {
-    // Legacy path for `@blocknote/xl-multi-column`'s hand-written PM nodes,
-    // which sit in the `bnBlock` group but have no `children` config. Plain
-    // `create` (not `createChecked` and no fill), so invalid structures
-    // surface via `node.check()` when the caller mutates the doc. Removed
-    // once multi-column is migrated onto the container API.
-    return schema.nodes[block.type].create(
-      {
-        id: id,
-        ...block.props,
-      },
-      children,
-    );
   } else if (isContainerNode(schema.nodes[block.type])) {
     const type = schema.nodes[block.type];
     const attrs = { id: id, ...block.props };

diff --git a/packages/core/src/api/nodeConversions/fragmentToBlocks.ts b/packages/core/src/api/nodeConversions/fragmentToBlocks.ts
@@ -92,23 +92,6 @@ export function fragmentToBlocks<
     }
 
     if (node.type.isInGroup("bnBlock")) {
-      // Legacy path for `@blocknote/xl-multi-column`'s hand-written PM nodes,
-      // which have no `children` config: flatten only a single-column
-      // columnList (not the entire column list has been selected), and keep
-      // every other column list intact, as before. Removed once multi-column
-      // is migrated onto the container API.
-      const blockConfig = getBlockSchema(node.type.schema)[node.type.name];
-      if (isContainerNode(node.type) && !getChildrenConfig(blockConfig ?? {})) {
-        if (node.type.name === "columnList" && node.childCount === 1) {
-          node.firstChild?.forEach((child) => {
-            blocks.push(nodeToBlock(child, node));
-          });
-          return false;
-        }
-        blocks.push(nodeToBlock(node, node));
-        return false;
-      }
-
       pushFlattened(node, node);
       return false;
     }

diff --git a/packages/core/src/editor/managers/ExtensionManager/extensions.ts b/packages/core/src/editor/managers/ExtensionManager/extensions.ts
@@ -65,11 +65,6 @@ export function getDefaultTiptapExtensions(
       // everything from bnBlock group (nodes that represent a BlockNote block should have an id)
       types: [
         "blockContainer",
-        // Legacy: `@blocknote/xl-multi-column`'s hand-written PM nodes, which
-        // have no `children` config and so aren't picked up below. Removed
-        // once multi-column is migrated onto the container API.
-        "columnList",
-        "column",
         // Container block specs whose PM node is itself in the `bnBlock`
         // group (column, columnList, callout, etc.). The bnBlock node is the
         // block itself, so the id lives on its attrs rather than on a

diff --git a/packages/core/src/exporter/Exporter.ts b/packages/core/src/exporter/Exporter.ts
@@ -85,12 +85,6 @@ export abstract class Exporter<
    * after the container's own output.
    */
   public isContainerBlock(blockType: string): boolean {
-    // Legacy: `@blocknote/xl-multi-column`'s hand-written specs, which have
-    // no `children` config. Removed once multi-column is migrated onto the
-    // container API.
-    if (blockType === "columnList" || blockType === "column") {
-      return true;
-    }
     const spec = (this.blockNoteSchema.blockSpecs as Record<string, any>)[
       blockType
     ];

diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
@@ -6,9 +6,6 @@ export * from "./api/blockManipulation/commands/replaceBlocks/replaceBlocks.js";
 // node type a container?") that integrations legitimately ask. It is defined
 // in `children.ts` and re-exported via `fixContainer.ts`.
 export { isContainerNode } from "./api/blockManipulation/containers/fixContainer.js";
-// Legacy column repair for `@blocknote/xl-multi-column`'s hand-written PM
-// nodes. Removed once multi-column is migrated onto the container API.
-export * from "./api/blockManipulation/commands/replaceBlocks/util/fixColumnList.js";
 export * from "./api/blockManipulation/commands/updateBlock/updateBlock.js";
 export * from "./api/exporters/html/externalHTMLExporter.js";
 export * from "./api/exporters/html/internalHTMLSerializer.js";