diff --git a/.prettierignore b/.prettierignore
index 9e125ab..b9afefb 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -4,3 +4,4 @@ node_modules
 **/package.json
 !/package.json
 jupyterlab_cell_diff
+.venv
diff --git a/README.md b/README.md
index a523864..e8d5449 100644
--- a/README.md
+++ b/README.md
@@ -1,25 +1,66 @@
-# JupyterLab Plugin: Show a Cell Diff
+# jupyterlab-cell-diff
 
 [![Github Actions Status](https://github.com/jupyter-ai-contrib/jupyterlab-cell-diff/workflows/Build/badge.svg)](https://github.com/jupyter-ai-contrib/jupyterlab-cell-diff/actions/workflows/build.yml)
 
-A JupyterLab Extension for showing cell (git) diffs.
-
-This extension is composed of a Python package named `jupyterlab_cell_diff`
-for the server extension and a NPM package named `jupyterlab-cell-diff`
-for the frontend extension.
+A JupyterLab extension for showing cell diffs with multiple diffing strategies.
 
 ## Requirements
 
 - JupyterLab >= 4.0.0
 
-## Install
+## Installation
 
-To install the extension, execute:
+### PyPI Installation
 
 ```bash
 pip install jupyterlab_cell_diff
 ```
 
+### Development Installation
+
+```bash
+# Clone the repository
+git clone https://github.com/jupyter-ai-contrib/jupyterlab-cell-diff.git
+cd jupyterlab-cell-diff
+
+# Install the extension in development mode
+pip install -e .
+jupyter labextension develop . --overwrite
+```
+
+## Usage
+
+### Commands
+
+The extension provides several commands:
+
+- `jupyterlab-cell-diff:show-codemirror` - Show diff using `@codemirror/merge`
+- `jupyterlab-cell-diff:show-nbdime` - Show diff using NBDime
+
+### Use with `@codemirror/merge`
+
+https://github.com/user-attachments/assets/0dacd7f0-5963-4ebe-81da-2958f0117071
+
+### Use with NBDime
+
+https://github.com/user-attachments/assets/87e93eab-ad67-468c-b228-f5a0e93f8bea
+
+### Programmatic Usage
+
+```typescript
+app.commands.execute('jupyterlab-cell-diff:show-codemirror', {
+  cellId: 'cell-id',
+  originalSource: 'print("Hello")',
+  newSource: 'print("Hello, World!")'
+});
+
+app.commands.execute('jupyterlab-cell-diff:show-nbdime', {
+  cellId: 'cell-id',
+  originalSource: 'print("Hello")',
+  newSource: 'print("Hello, World!")'
+});
+```
+
 ## Uninstall
 
 To remove the extension, execute:
diff --git a/package.json b/package.json
index 4d42244..6b8eacc 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,8 @@
     "files": [
         "lib/**/*.{d.ts,eot,gif,html,jpg,js,js.map,json,png,svg,woff2,ttf}",
         "style/**/*.{css,js,eot,gif,html,jpg,json,png,svg,woff2,ttf}",
-        "src/**/*.{ts,tsx}"
+        "src/**/*.{ts,tsx}",
+        "schema/*.json"
     ],
     "main": "lib/index.js",
     "types": "lib/index.d.ts",
@@ -55,14 +56,19 @@
         "watch:labextension": "jupyter labextension watch ."
     },
     "dependencies": {
+        "@codemirror/lang-python": "^6.2.1",
+        "@codemirror/merge": "^6.10.2",
+        "@codemirror/view": "^6.38.2",
         "@jupyterlab/application": "^4.0.0",
         "@jupyterlab/cells": "^4.0.0",
         "@jupyterlab/codeeditor": "^4.0.0",
+        "@jupyterlab/codemirror": "^4.4.7",
         "@jupyterlab/coreutils": "^6.0.0",
         "@jupyterlab/notebook": "^4.0.0",
         "@jupyterlab/services": "^7.0.0",
         "@jupyterlab/ui-components": "^4.0.0",
         "@lumino/widgets": "^2.0.0",
+        "codemirror": "^6.0.2",
         "jupyterlab-cell-input-footer": "^0.3.0",
         "nbdime": "^7.0.1"
     },
diff --git a/pyproject.toml b/pyproject.toml
index a241873..e5d5149 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,8 +25,8 @@ classifiers = [
 dependencies = [
     "nbdime",
     "jupyter_server>=2.4.0,<3",
-    "jupyterlab-eventlistener>=0.4.0",
-    "jupyterlab-cell-input-footer>=0.2.0"
+    "jupyterlab-eventlistener>=0.4.0,<0.5",
+    "jupyterlab-cell-input-footer>=0.3.1,<0.4"
 ]
 dynamic = ["version", "description", "authors", "urls", "keywords"]
 
diff --git a/src/command.ts b/src/command.ts
deleted file mode 100644
index 7793fb8..0000000
--- a/src/command.ts
+++ /dev/null
@@ -1,97 +0,0 @@
-import { ICellFooterTracker } from 'jupyterlab-cell-input-footer';
-import { IDiffEntry } from 'nbdime/lib/diff/diffentries';
-import { createPatchStringDiffModel } from 'nbdime/lib/diff/model';
-import { MergeView } from 'nbdime/lib/common/mergeview';
-import { ToolbarButton } from '@jupyterlab/ui-components';
-import { requestAPI } from './handler';
-
-export namespace ShowDiff {
-  export interface ICommandArgs {
-    cell_id?: string;
-    original_source: string;
-    diff: IDiffEntry[];
-  }
-
-  export interface IFetchDiff {
-    original_source: string;
-    new_source: string;
-  }
-}
-
-/**
- * Adds a Diff UX underneath a JupyterLab cell.
- *
- * @param data
- * @param cellFooterTracker
- */
-export function showCellDiff(
-  data: ShowDiff.ICommandArgs,
-  cellFooterTracker: ICellFooterTracker
-) {
-  const diff = createPatchStringDiffModel(
-    data['original_source'],
-    data['diff']
-  );
-
-  const mergeView = new MergeView({ remote: diff });
-  //
-  mergeView.addClass('jp-cell-diff');
-  // Add the classes below to pick up the styling from nbdime.
-  mergeView.addClass('nbdime-root');
-  mergeView.addClass('jp-Notebook-diff');
-  mergeView.hide();
-
-  const footer = cellFooterTracker.getFooter(data.cell_id);
-
-  // Try removing any old widget, if it exists.
-  try {
-    footer?.removeWidget('jp-cell-diff');
-    footer?.removeToolbarItem('compare');
-  } finally {
-    // Do Nothing
-  }
-
-  footer?.addWidget(mergeView);
-
-  if (footer?.isHidden) {
-    footer.show();
-    footer.update();
-  }
-  footer?.addToolbarItemOnLeft(
-    'compare',
-    new ToolbarButton({
-      // icon: wandIcon,
-      label: 'Compare changes',
-      enabled: true,
-      onClick: () => {
-        if (mergeView.isHidden) {
-          mergeView.show();
-          return;
-        }
-        mergeView.hide();
-      }
-    })
-  );
-}
-
-export async function fetchDiff(
-  data: ShowDiff.IFetchDiff
-): Promise<ShowDiff.ICommandArgs> {
-  return await requestAPI('api/celldiff');
-}
-
-/**
- * Adds a diff to the Cell Footer
- *
- */
-export function showCellDiffCommand(cellFooterTracker: ICellFooterTracker) {
-  return (args: any) => {
-    const data: ShowDiff.ICommandArgs = args as any;
-    const cellId = data['cell_id'];
-    if (cellId) {
-      if (data && data['original_source'] && data['diff']) {
-        showCellDiff(data, cellFooterTracker);
-      }
-    }
-  };
-}
diff --git a/src/diff/codemirror.ts b/src/diff/codemirror.ts
new file mode 100644
index 0000000..d78e567
--- /dev/null
+++ b/src/diff/codemirror.ts
@@ -0,0 +1,111 @@
+import { python } from '@codemirror/lang-python';
+import { MergeView } from '@codemirror/merge';
+import { EditorView } from '@codemirror/view';
+import { jupyterTheme } from '@jupyterlab/codemirror';
+import { Message } from '@lumino/messaging';
+import { Widget } from '@lumino/widgets';
+import { basicSetup } from 'codemirror';
+import { IDiffWidgetOptions, BaseDiffWidget } from '../widget';
+
+/**
+ * A Lumino widget that contains a CodeMirror diff view
+ */
+class CodeMirrorDiffWidget extends BaseDiffWidget {
+  /**
+   * Construct a new CodeMirrorDiffWidget.
+   */
+  constructor(options: IDiffWidgetOptions) {
+    super(options);
+    this._originalCode = options.originalSource;
+    this._modifiedCode = options.newSource;
+    this.addClass('jp-DiffView');
+  }
+
+  /**
+   * Handle after-attach messages for the widget.
+   */
+  protected onAfterAttach(msg: Message): void {
+    super.onAfterAttach(msg);
+    this._createMergeView();
+  }
+
+  /**
+   * Handle before-detach messages for the widget.
+   */
+  protected onBeforeDetach(msg: Message): void {
+    this._destroyMergeView();
+    super.onBeforeDetach(msg);
+  }
+
+  /**
+   * Create the merge view with CodeMirror diff functionality.
+   */
+  private _createMergeView(): void {
+    if (this._mergeView) {
+      return;
+    }
+
+    this._mergeView = new MergeView({
+      a: {
+        doc: this._originalCode,
+        extensions: [
+          basicSetup,
+          python(),
+          EditorView.editable.of(false),
+          jupyterTheme
+        ]
+      },
+      b: {
+        doc: this._modifiedCode,
+        extensions: [
+          basicSetup,
+          python(),
+          EditorView.editable.of(false),
+          jupyterTheme
+        ]
+      },
+      parent: this.node
+    });
+  }
+
+  /**
+   * Destroy the merge view and clean up resources.
+   */
+  private _destroyMergeView(): void {
+    if (this._mergeView) {
+      this._mergeView.destroy();
+      this._mergeView = null;
+    }
+  }
+
+  private _originalCode: string;
+  private _modifiedCode: string;
+  private _mergeView: MergeView | null = null;
+}
+
+export async function createCodeMirrorDiffWidget(
+  options: IDiffWidgetOptions
+): Promise<Widget> {
+  const {
+    cell,
+    cellFooterTracker,
+    originalSource,
+    newSource,
+    showActionButtons = true,
+    openDiff = true
+  } = options;
+
+  const diffWidget = new CodeMirrorDiffWidget({
+    originalSource,
+    newSource,
+    cell,
+    cellFooterTracker,
+    showActionButtons,
+    openDiff
+  });
+
+  diffWidget.addClass('jupyterlab-cell-diff');
+  diffWidget.addToFooter();
+
+  return diffWidget;
+}
diff --git a/src/diff/nbdime.ts b/src/diff/nbdime.ts
new file mode 100644
index 0000000..c068d55
--- /dev/null
+++ b/src/diff/nbdime.ts
@@ -0,0 +1,78 @@
+import { IDiffWidgetOptions } from '../widget';
+import { IDiffEntry } from 'nbdime/lib/diff/diffentries';
+import { createPatchStringDiffModel } from 'nbdime/lib/diff/model';
+import { MergeView } from 'nbdime/lib/common/mergeview';
+import { Widget } from '@lumino/widgets';
+import { BaseDiffWidget } from '../widget';
+
+/**
+ * Options for creating an NBDime diff widget
+ */
+interface INBDimeDiffWidgetOptions extends IDiffWidgetOptions {
+  remote: any;
+}
+
+/**
+ * Extended NBDime MergeView widget with action buttons support
+ */
+class NBDimeDiffWidget extends BaseDiffWidget {
+  /**
+   * Construct a new NBDimeDiffWidget.
+   */
+  constructor(options: INBDimeDiffWidgetOptions) {
+    super(options);
+
+    // Create the NBDime merge view as a child widget
+    this._mergeView = new MergeView({ remote: options.remote });
+    this._mergeView.addClass('nbdime-diff-widget');
+    this._mergeView.addClass('jp-cell-diff');
+    this._mergeView.addClass('nbdime-root');
+    this._mergeView.addClass('jp-Notebook-diff');
+
+    // Add the merge view to this widget's node
+    this.node.appendChild(this._mergeView.node);
+    this.addClass('jp-DiffView');
+  }
+  private _mergeView: MergeView;
+}
+
+/**
+ * Create a diff widget using NBDime
+ */
+export async function createNBDimeDiffWidget(
+  options: IDiffWidgetOptions
+): Promise<Widget> {
+  const {
+    cell,
+    cellFooterTracker,
+    originalSource,
+    newSource,
+    diffData,
+    showActionButtons = true,
+    openDiff = true
+  } = options;
+
+  if (!diffData || !diffData.diff) {
+    throw new Error('NBDime strategy requires diff data');
+  }
+
+  const diff = createPatchStringDiffModel(
+    originalSource,
+    diffData.diff as IDiffEntry[]
+  );
+
+  const diffWidget = new NBDimeDiffWidget({
+    remote: diff,
+    cell,
+    cellFooterTracker,
+    originalSource,
+    newSource,
+    showActionButtons,
+    openDiff
+  });
+
+  diffWidget.addClass('jupyterlab-cell-diff');
+  diffWidget.addToFooter();
+
+  return diffWidget;
+}
diff --git a/src/index.ts b/src/index.ts
index 05c4d94..d0883fe 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,30 +1,3 @@
-import {
-  JupyterFrontEnd,
-  JupyterFrontEndPlugin
-} from '@jupyterlab/application';
+import plugin from './plugin';
 
-import { showCellDiffCommand } from './command';
-
-import { ICellFooterTracker } from 'jupyterlab-cell-input-footer';
-
-/**
- * A JupyterLab plugin providing a command for displaying a diff below a cell.
- */
-const showDiff: JupyterFrontEndPlugin<void> = {
-  id: 'jupyterlab-cell-diff',
-  requires: [ICellFooterTracker],
-  autoStart: true,
-  activate: async (
-    app: JupyterFrontEnd,
-    cellFooterTracker: ICellFooterTracker
-  ) => {
-    console.log('Jupyterlab extension - show cell diff.');
-    await app.serviceManager.ready;
-
-    app.commands.addCommand('show-diff', {
-      execute: showCellDiffCommand(cellFooterTracker)
-    });
-  }
-};
-
-export default [showDiff];
+export default plugin;
diff --git a/src/plugin.ts b/src/plugin.ts
new file mode 100644
index 0000000..a4f2dd8
--- /dev/null
+++ b/src/plugin.ts
@@ -0,0 +1,261 @@
+import {
+  JupyterFrontEnd,
+  JupyterFrontEndPlugin
+} from '@jupyterlab/application';
+import { ICellModel } from '@jupyterlab/cells';
+import { INotebookTracker, NotebookPanel } from '@jupyterlab/notebook';
+import { ICellFooterTracker } from 'jupyterlab-cell-input-footer';
+
+import { requestAPI } from './handler';
+import { IDiffWidgetOptions } from './widget';
+import { createNBDimeDiffWidget } from './diff/nbdime';
+import { createCodeMirrorDiffWidget } from './diff/codemirror';
+
+/**
+ * Find a notebook by path using the notebook tracker
+ */
+export function findNotebook(
+  notebookTracker: INotebookTracker,
+  notebookPath?: string
+): NotebookPanel | null {
+  const notebook = notebookTracker.find(
+    widget => widget.context.path === notebookPath
+  );
+
+  return notebook ?? notebookTracker.currentWidget;
+}
+
+/**
+ * Find a cell in a notebook by ID or return the active cell
+ */
+export function findCell(
+  notebook: NotebookPanel,
+  cellId?: string
+): ICellModel | null {
+  const notebookWidget = notebook.content;
+  const model = notebookWidget.model;
+
+  let cell = notebookWidget.activeCell?.model;
+  if (cellId && model) {
+    for (let i = 0; i < model.cells.length; i++) {
+      const c = model.cells.get(i);
+      if (c.id === cellId) {
+        cell = c;
+        break;
+      }
+    }
+  }
+
+  return cell ?? null;
+}
+
+/**
+ * CodeMirror diff plugin
+ */
+const codeMirrorPlugin: JupyterFrontEndPlugin<void> = {
+  id: 'jupyterlab-cell-diff:codemirror-plugin',
+  description: 'Expose a command to show cell diffs using CodeMirror',
+  requires: [ICellFooterTracker, INotebookTracker],
+  autoStart: true,
+  activate: async (
+    app: JupyterFrontEnd,
+    cellFooterTracker: ICellFooterTracker,
+    notebookTracker: INotebookTracker
+  ) => {
+    const { commands } = app;
+
+    commands.addCommand('jupyterlab-cell-diff:show-codemirror', {
+      label: 'Show Cell Diff (CodeMirror)',
+      describedBy: {
+        args: {
+          type: 'object',
+          properties: {
+            cellId: {
+              type: 'string',
+              description: 'ID of the cell to show diff for'
+            },
+            originalSource: {
+              type: 'string',
+              description: 'Original source code to compare against'
+            },
+            newSource: {
+              type: 'string',
+              description: 'New source code to compare with'
+            },
+            showActionButtons: {
+              type: 'boolean',
+              description: 'Whether to show action buttons in the diff widget'
+            },
+            notebookPath: {
+              type: 'string',
+              description: 'Path to the notebook containing the cell'
+            },
+            openDiff: {
+              type: 'boolean',
+              description: 'Whether to open the diff widget automatically'
+            }
+          }
+        }
+      },
+      execute: async (args: any = {}) => {
+        const {
+          cellId,
+          originalSource,
+          newSource,
+          showActionButtons = true,
+          notebookPath,
+          openDiff = true
+        } = args;
+
+        const currentNotebook = findNotebook(notebookTracker, notebookPath);
+        if (!currentNotebook) {
+          return;
+        }
+
+        const cell = findCell(currentNotebook, cellId);
+        if (!cell) {
+          console.error(
+            'Missing required arguments: cellId (or no active cell found)'
+          );
+          return;
+        }
+
+        const footer = cellFooterTracker.getFooter(cell.id);
+        if (!footer) {
+          console.error(`Footer not found for cell ${cell.id}`);
+          return;
+        }
+
+        try {
+          const options: IDiffWidgetOptions = {
+            cell,
+            cellFooterTracker,
+            originalSource,
+            newSource,
+            showActionButtons,
+            openDiff
+          };
+
+          await createCodeMirrorDiffWidget(options);
+        } catch (error) {
+          console.error('Failed to create diff widget:', error);
+        }
+      }
+    });
+  }
+};
+
+/**
+ * NBDime diff plugin
+ */
+const nbdimePlugin: JupyterFrontEndPlugin<void> = {
+  id: 'jupyterlab-cell-diff:nbdime-plugin',
+  description: 'Expose a command to show cell diffs using NBDime',
+  requires: [ICellFooterTracker, INotebookTracker],
+  autoStart: true,
+  activate: async (
+    app: JupyterFrontEnd,
+    cellFooterTracker: ICellFooterTracker,
+    notebookTracker: INotebookTracker
+  ) => {
+    const { commands } = app;
+
+    commands.addCommand('jupyterlab-cell-diff:show-nbdime', {
+      label: 'Show Cell Diff (NBDime)',
+      describedBy: {
+        args: {
+          type: 'object',
+          properties: {
+            cellId: {
+              type: 'string',
+              description: 'ID of the cell to show diff for'
+            },
+            originalSource: {
+              type: 'string',
+              description: 'Original source code to compare against'
+            },
+            newSource: {
+              type: 'string',
+              description: 'New source code to compare with'
+            },
+            showActionButtons: {
+              type: 'boolean',
+              description: 'Whether to show action buttons in the diff widget'
+            },
+            notebookPath: {
+              type: 'string',
+              description: 'Path to the notebook containing the cell'
+            },
+            openDiff: {
+              type: 'boolean',
+              description: 'Whether to open the diff widget automatically'
+            }
+          }
+        }
+      },
+      execute: async (args: any = {}) => {
+        const {
+          cellId,
+          originalSource,
+          newSource,
+          showActionButtons = true,
+          notebookPath,
+          openDiff = true
+        } = args;
+
+        const currentNotebook = findNotebook(notebookTracker, notebookPath);
+        if (!currentNotebook) {
+          return;
+        }
+
+        const cell = findCell(currentNotebook, cellId);
+        if (!cell) {
+          console.error(
+            'Missing required arguments: cellId (or no active cell found)'
+          );
+          return;
+        }
+
+        // For NBDime, fetch diff data from server
+        let diffData;
+        try {
+          const response = await requestAPI<any>('api/celldiff', {
+            method: 'POST',
+            body: JSON.stringify({
+              original_source: originalSource,
+              new_source: newSource
+            })
+          });
+          diffData = (response as any).diff;
+        } catch (error) {
+          console.warn('Failed to fetch diff data from server:', error);
+        }
+
+        const footer = cellFooterTracker.getFooter(cell.id);
+        if (!footer) {
+          console.error(`Footer not found for cell ${cell.id}`);
+          return;
+        }
+
+        try {
+          const options: IDiffWidgetOptions = {
+            cell,
+            cellFooterTracker,
+            originalSource,
+            newSource,
+            diffData: diffData ? { diff: diffData } : undefined,
+            cellId: cell.id,
+            showActionButtons,
+            openDiff
+          };
+
+          await createNBDimeDiffWidget(options);
+        } catch (error) {
+          console.error('Failed to create diff widget:', error);
+        }
+      }
+    });
+  }
+};
+
+export default [codeMirrorPlugin, nbdimePlugin];
diff --git a/src/widget.ts b/src/widget.ts
new file mode 100644
index 0000000..710d12c
--- /dev/null
+++ b/src/widget.ts
@@ -0,0 +1,194 @@
+import { ICellModel } from '@jupyterlab/cells';
+import { checkIcon, ToolbarButton, undoIcon } from '@jupyterlab/ui-components';
+import { Widget } from '@lumino/widgets';
+import { ICellFooterTracker } from 'jupyterlab-cell-input-footer';
+
+/**
+ * Options for creating a diff widget
+ */
+export interface IDiffWidgetOptions {
+  /**
+   * The cell to show the diff for
+   */
+  cell: ICellModel;
+
+  /**
+   * The cell footer tracker
+   */
+  cellFooterTracker: ICellFooterTracker;
+
+  /**
+   * The original source code
+   */
+  originalSource: string;
+
+  /**
+   * The new/modified source code
+   */
+  newSource: string;
+
+  /**
+   * Additional diff data (for nbdime strategy)
+   */
+  diffData?: any;
+
+  /**
+   * Cell ID for identification
+   */
+  cellId?: string;
+
+  /**
+   * Whether to show accept/reject buttons
+   */
+  showActionButtons?: boolean;
+
+  /**
+   * Whether to open the diff automatically (defaults to true)
+   */
+  openDiff?: boolean;
+}
+
+/**
+ * Base class for diff widgets with shared action button functionality
+ */
+export abstract class BaseDiffWidget extends Widget {
+  /**
+   * Construct a new BaseDiffWidget.
+   */
+  constructor(options: IDiffWidgetOptions) {
+    super();
+    this._cell = options.cell;
+    this._cellFooterTracker = options.cellFooterTracker;
+    this._originalSource = options.originalSource;
+    this._newSource = options.newSource || options.cell.sharedModel.getSource();
+    this._showActionButtons = options.showActionButtons ?? true;
+    this._openDiff = options.openDiff ?? true;
+  }
+
+  /**
+   * Create and add the diff widget to the cell footer with buttons.
+   */
+  public addToFooter(): void {
+    if (!this._cellFooterTracker || !this._cell) {
+      return;
+    }
+
+    const cellId = this._cell.id;
+    const footer = this._cellFooterTracker.getFooter(cellId);
+    if (!footer) {
+      return;
+    }
+
+    footer.removeWidget('jupyterlab-cell-diff');
+    footer.removeToolbarItem('accept-diff');
+    footer.removeToolbarItem('reject-diff');
+    footer.removeToolbarItem('toggle-diff');
+    footer.removeToolbarItem('compare');
+
+    footer.addWidget(this);
+
+    this._createButtons(footer);
+
+    this._cellFooterTracker.showFooter(cellId);
+  }
+
+  /**
+   * Handle accept button click event.
+   */
+  public onAcceptClick(): void {
+    if (this._cell) {
+      this._cell.sharedModel.setSource(this._newSource);
+      this._closeDiffView();
+    }
+  }
+
+  /**
+   * Handle reject button click event.
+   */
+  public onRejectClick(): void {
+    if (this._cell) {
+      this._cell.sharedModel.setSource(this._originalSource);
+      this._closeDiffView();
+    }
+  }
+
+  /**
+   * Handle toggle diff visibility
+   */
+  public onToggleClick(): void {
+    if (this.isHidden) {
+      this.show();
+    } else {
+      this.hide();
+    }
+  }
+
+  /**
+   * Create accept, reject, and toggle buttons for the footer toolbar.
+   */
+  private _createButtons(footer: any): void {
+    this._toggleButton = new ToolbarButton({
+      label: 'Compare changes',
+      enabled: true,
+      className: 'jp-DiffView-toggle',
+      onClick: () => {
+        this.onToggleClick();
+      }
+    });
+
+    footer.addToolbarItemOnLeft('toggle-diff', this._toggleButton);
+
+    if (this._showActionButtons) {
+      const rejectButton = new ToolbarButton({
+        icon: undoIcon,
+        tooltip: 'Reject Changes',
+        enabled: true,
+        className: 'jp-DiffView-reject',
+        onClick: () => this.onRejectClick()
+      });
+
+      const acceptButton = new ToolbarButton({
+        icon: checkIcon,
+        tooltip: 'Accept Changes',
+        enabled: true,
+        className: 'jp-DiffView-accept',
+        onClick: () => this.onAcceptClick()
+      });
+
+      footer.addToolbarItemOnRight('reject-diff', rejectButton);
+      footer.addToolbarItemOnRight('accept-diff', acceptButton);
+    }
+
+    if (this._openDiff) {
+      this.show();
+    } else {
+      this.hide();
+    }
+  }
+
+  /**
+   * Close the diff view and clean up the footer.
+   */
+  private _closeDiffView(): void {
+    if (this._cellFooterTracker && this._cell) {
+      const cellId = this._cell.id;
+      const footer = this._cellFooterTracker.getFooter(cellId);
+      if (footer) {
+        footer.removeWidget('jupyterlab-cell-diff');
+        footer.removeToolbarItem('accept-diff');
+        footer.removeToolbarItem('reject-diff');
+        footer.removeToolbarItem('toggle-diff');
+        footer.removeToolbarItem('compare');
+      }
+      this._cellFooterTracker.hideFooter(cellId);
+    }
+  }
+
+  protected _cell: ICellModel;
+  protected _cellFooterTracker: ICellFooterTracker;
+  protected _originalSource: string;
+  protected _newSource: string;
+  protected _showActionButtons: boolean;
+  protected _openDiff: boolean;
+  protected _toggleButton: ToolbarButton | null = null;
+}
diff --git a/style/base.css b/style/base.css
index 78b6db9..a3e9802 100644
--- a/style/base.css
+++ b/style/base.css
@@ -4,6 +4,7 @@
     https://jupyterlab.readthedocs.io/en/stable/developer/css.html
 */
 
+/* CodeMirror merge view styling */
 .jp-cellfooter .cm-merge-2pane {
   display: grid;
   padding: 0;
@@ -12,3 +13,20 @@
   grid-template-columns: 49% 2% 49%;
   grid-auto-rows: minmax(18px, auto);
 }
+
+/* Diff widget styling */
+.jp-DiffView {
+  background-color: var(--jp-layout-color0);
+}
+
+.jp-DiffView .cm-merge-2pane {
+  min-height: 100px;
+  max-height: 400px;
+  overflow: auto;
+}
+
+/* NBDime diff widget styling */
+.nbdime-diff-widget {
+  max-height: 400px;
+  overflow: auto;
+}
diff --git a/tsconfig.json b/tsconfig.json
index 25ac47e..bb62e1c 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -20,5 +20,5 @@
     "strictNullChecks": true,
     "target": "ES2018"
   },
-  "include": ["src/*"]
+  "include": ["src/**/*"]
 }
diff --git a/yarn.lock b/yarn.lock
index a267457..412a3b2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -23,32 +23,27 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/autocomplete@npm:^6.0.0, @codemirror/autocomplete@npm:^6.16.0, @codemirror/autocomplete@npm:^6.3.2, @codemirror/autocomplete@npm:^6.7.1":
-  version: 6.18.3
-  resolution: "@codemirror/autocomplete@npm:6.18.3"
+"@codemirror/autocomplete@npm:^6.0.0, @codemirror/autocomplete@npm:^6.18.6, @codemirror/autocomplete@npm:^6.3.2, @codemirror/autocomplete@npm:^6.7.1":
+  version: 6.18.7
+  resolution: "@codemirror/autocomplete@npm:6.18.7"
   dependencies:
     "@codemirror/language": ^6.0.0
     "@codemirror/state": ^6.0.0
     "@codemirror/view": ^6.17.0
     "@lezer/common": ^1.0.0
-  peerDependencies:
-    "@codemirror/language": ^6.0.0
-    "@codemirror/state": ^6.0.0
-    "@codemirror/view": ^6.0.0
-    "@lezer/common": ^1.0.0
-  checksum: 48f3a09e05a2ab236641c3df0dbd577ef4c04da8ea8c26c47bc90f5652342a62d6e736e6b89428a85ff50efe039c01f0f0864134914a40a1513a4d57024cbb76
+  checksum: 27c4112b5c589e769b9278e9ef291e76ea990c06e5d254da53297182ffff764c7ea3397ecb6b16aca86c4900a3da2359dcc964f56e0b094e4afdd83a31bcbb08
   languageName: node
   linkType: hard
 
-"@codemirror/commands@npm:^6.5.0":
-  version: 6.7.1
-  resolution: "@codemirror/commands@npm:6.7.1"
+"@codemirror/commands@npm:^6.0.0, @codemirror/commands@npm:^6.8.1":
+  version: 6.8.1
+  resolution: "@codemirror/commands@npm:6.8.1"
   dependencies:
     "@codemirror/language": ^6.0.0
     "@codemirror/state": ^6.4.0
     "@codemirror/view": ^6.27.0
     "@lezer/common": ^1.1.0
-  checksum: 507ae0cc7f3a7bd869bca0de7e942ecb2bc0bd95a42484e5b06835ebf8caf7626c39d2bea26cefab99d07ab83ba5934afd2d07ce00dac4190aca014523f3c97e
+  checksum: 838365af4f12e985c35f4bc59e38eb809e951fd3e35d5ad43548e61c26deda050276346dd031b9c6ed7fe13a777d59c37b9b1e46609d1d79e622d908340a468e
   languageName: node
   linkType: hard
 
@@ -62,7 +57,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/lang-css@npm:^6.0.0, @codemirror/lang-css@npm:^6.2.1":
+"@codemirror/lang-css@npm:^6.0.0, @codemirror/lang-css@npm:^6.3.1":
   version: 6.3.1
   resolution: "@codemirror/lang-css@npm:6.3.1"
   dependencies:
@@ -102,9 +97,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/lang-javascript@npm:^6.0.0, @codemirror/lang-javascript@npm:^6.2.2":
-  version: 6.2.2
-  resolution: "@codemirror/lang-javascript@npm:6.2.2"
+"@codemirror/lang-javascript@npm:^6.0.0, @codemirror/lang-javascript@npm:^6.2.3":
+  version: 6.2.4
+  resolution: "@codemirror/lang-javascript@npm:6.2.4"
   dependencies:
     "@codemirror/autocomplete": ^6.0.0
     "@codemirror/language": ^6.6.0
@@ -113,7 +108,7 @@ __metadata:
     "@codemirror/view": ^6.17.0
     "@lezer/common": ^1.0.0
     "@lezer/javascript": ^1.0.0
-  checksum: 66379942a8347dff2bd76d10ed7cf313bca83872f8336fdd3e14accfef23e7b690cd913c9d11a3854fba2b32299da07fc3275995327642c9ee43c2a8e538c19d
+  checksum: 0350e9ac2df155c4ecf75d556f40b677c284c1d320620dc7228e2aa458e258dd1145c86e5ebf3451347ed6ef528f72c2eb60f5d3f6bd10af8aabb2819109e21a
   languageName: node
   linkType: hard
 
@@ -127,9 +122,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/lang-markdown@npm:^6.1.1, @codemirror/lang-markdown@npm:^6.2.5":
-  version: 6.3.1
-  resolution: "@codemirror/lang-markdown@npm:6.3.1"
+"@codemirror/lang-markdown@npm:^6.1.1, @codemirror/lang-markdown@npm:^6.3.2":
+  version: 6.3.4
+  resolution: "@codemirror/lang-markdown@npm:6.3.4"
   dependencies:
     "@codemirror/autocomplete": ^6.7.1
     "@codemirror/lang-html": ^6.0.0
@@ -138,7 +133,7 @@ __metadata:
     "@codemirror/view": ^6.0.0
     "@lezer/common": ^1.2.1
     "@lezer/markdown": ^1.0.0
-  checksum: cd0281c6b7130b2f12903c82a2f36b53b428002577a9fdab09de810a95ef0db5049ef951e2a065b0f38b42af854bee176492238e5ab116099e4799950638cadc
+  checksum: d707a67b6b0e884da5a1863f1c03324d660b7b2955e16a0dafa1b4301e1fc1823e35b8f25106ef5328d49084f8b9ada716d142590f91f64070804fb65b36e75f
   languageName: node
   linkType: hard
 
@@ -155,16 +150,16 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/lang-python@npm:^6.1.6":
-  version: 6.1.6
-  resolution: "@codemirror/lang-python@npm:6.1.6"
+"@codemirror/lang-python@npm:^6.2.0, @codemirror/lang-python@npm:^6.2.1":
+  version: 6.2.1
+  resolution: "@codemirror/lang-python@npm:6.2.1"
   dependencies:
     "@codemirror/autocomplete": ^6.3.2
     "@codemirror/language": ^6.8.0
     "@codemirror/state": ^6.0.0
     "@lezer/common": ^1.2.1
     "@lezer/python": ^1.1.4
-  checksum: eb1faabd332bb95d0f3e227eb19ac5a31140cf238905bbe73e061040999f5680a012f9145fb3688bc2fcbb1908c957511edc8eeb8a9aa88d27d4fa55ad451e95
+  checksum: 977ce444ab7c68261107c40e8a46d3480a239ac5a093f39fad7da0644fc08cb4b90552c8b7fad396f936e34b5bbac510533ea7b4229d3b8271774a1af1e717aa
   languageName: node
   linkType: hard
 
@@ -178,9 +173,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/lang-sql@npm:^6.6.4":
-  version: 6.8.0
-  resolution: "@codemirror/lang-sql@npm:6.8.0"
+"@codemirror/lang-sql@npm:^6.8.0":
+  version: 6.9.1
+  resolution: "@codemirror/lang-sql@npm:6.9.1"
   dependencies:
     "@codemirror/autocomplete": ^6.0.0
     "@codemirror/language": ^6.0.0
@@ -188,7 +183,7 @@ __metadata:
     "@lezer/common": ^1.2.0
     "@lezer/highlight": ^1.0.0
     "@lezer/lr": ^1.0.0
-  checksum: 1b5a3c8129b09f24039d8c0906fc4cb8d0f706a424a1d56721057bd1e647797c2b1240bb53eed9bf2bac5806a4e0363e555a3963f04c478efa05829890c537f7
+  checksum: a6b8851c789b05b5fdd6b047c61f526278b6b97e3fd2329a5fb04847ce0329f4c52198e6fd405a5bb3b6b40bc4432ad9edf06eb37d728a0c31cc45bf008ff41e
   languageName: node
   linkType: hard
 
@@ -218,9 +213,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/language@npm:^6.0.0, @codemirror/language@npm:^6.10.1, @codemirror/language@npm:^6.3.0, @codemirror/language@npm:^6.4.0, @codemirror/language@npm:^6.6.0, @codemirror/language@npm:^6.8.0":
-  version: 6.10.6
-  resolution: "@codemirror/language@npm:6.10.6"
+"@codemirror/language@npm:^6.0.0, @codemirror/language@npm:^6.11.0, @codemirror/language@npm:^6.3.0, @codemirror/language@npm:^6.4.0, @codemirror/language@npm:^6.6.0, @codemirror/language@npm:^6.8.0":
+  version: 6.11.3
+  resolution: "@codemirror/language@npm:6.11.3"
   dependencies:
     "@codemirror/state": ^6.0.0
     "@codemirror/view": ^6.23.0
@@ -228,16 +223,16 @@ __metadata:
     "@lezer/highlight": ^1.0.0
     "@lezer/lr": ^1.0.0
     style-mod: ^4.0.0
-  checksum: 0bd5e4da0c714b4d2aad2e2ad19bb803d9992e5f0d56da3fb2534e63b03b8a562bd8b9ac4439509c687b589e3eaa5a33339eda13d91e54a5d5a99e032d1be981
+  checksum: 9ad560fb90ccb8e5660ee162b7ca36323b0cc0fe2c2885a93f052763c177e10118930aae5cdea410e90cf2a6a2b86438a7503fcc6d1f550c8d75a6757e31f3bf
   languageName: node
   linkType: hard
 
-"@codemirror/legacy-modes@npm:^6.3.2, @codemirror/legacy-modes@npm:^6.4.0":
-  version: 6.4.2
-  resolution: "@codemirror/legacy-modes@npm:6.4.2"
+"@codemirror/legacy-modes@npm:^6.3.2, @codemirror/legacy-modes@npm:^6.5.1":
+  version: 6.5.1
+  resolution: "@codemirror/legacy-modes@npm:6.5.1"
   dependencies:
     "@codemirror/language": ^6.0.0
-  checksum: fe55df97efe980a573ff5572f480eae323d7652a4a61435c654a90142def7102218023590112de7cd826c495ecaadae68a89fb5e5d4323d207af267bcce1d0c1
+  checksum: ad92399fdd5f7342d2b8d1ef450ac01cee96f2266938ca09de5047998bf6ac7a085dfe9941feb9ef6a924fda80aa7a1dc0ddc5dd6ce9c3ceaa36bcc14c5b2264
   languageName: node
   linkType: hard
 
@@ -252,34 +247,48 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/search@npm:^6.5.6":
-  version: 6.5.8
-  resolution: "@codemirror/search@npm:6.5.8"
+"@codemirror/merge@npm:^6.10.2":
+  version: 6.10.2
+  resolution: "@codemirror/merge@npm:6.10.2"
+  dependencies:
+    "@codemirror/language": ^6.0.0
+    "@codemirror/state": ^6.0.0
+    "@codemirror/view": ^6.17.0
+    "@lezer/highlight": ^1.0.0
+    style-mod: ^4.1.0
+  checksum: 7083a3d1c61e57c038dc77ec645cd4d189bf4c636abeb351b93df7b9fcce26462f93b28f89d52cdcd3bc39d5e6610113896c67ae97e2d06615f35ff1aaf0eae9
+  languageName: node
+  linkType: hard
+
+"@codemirror/search@npm:^6.0.0, @codemirror/search@npm:^6.5.10":
+  version: 6.5.11
+  resolution: "@codemirror/search@npm:6.5.11"
   dependencies:
     "@codemirror/state": ^6.0.0
     "@codemirror/view": ^6.0.0
     crelt: ^1.0.5
-  checksum: 0f9633037492a7b647b606c30255ea42c4327319e643be7ea3aa2913ed8e4aa662589f457e376636521c7d4d1215fae0e8939f127db9c0790b19ae3b654c3bc4
+  checksum: 4d418f176bd93705bc51c82a2f1c0e41fecc0368dc43c415635c4dfdd763aa05ebdf7f000bc9ca0083c1887e6d305b89482ec1f4db8b8765c6f38de324187476
   languageName: node
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-"@codemirror/state@npm:^6.0.0, @codemirror/state@npm:^6.2.0, @codemirror/state@npm:^6.4.0, @codemirror/state@npm:^6.4.1, @codemirror/state@npm:^6.5.0":
-  version: 6.5.0
-  resolution: "@codemirror/state@npm:6.5.0"
+"@codemirror/state@npm:^6.0.0, @codemirror/state@npm:^6.2.0, @codemirror/state@npm:^6.4.0, @codemirror/state@npm:^6.4.1, @codemirror/state@npm:^6.5.0, @codemirror/state@npm:^6.5.2":
+  version: 6.5.2
+  resolution: "@codemirror/state@npm:6.5.2"
   dependencies:
     "@marijn/find-cluster-break": ^1.0.0
-  checksum: f7fbed072cc67bf250f7d231668a00b988748cacaaa2ce3ea74ff13c7c392db76000e7d517933521cc6ad9dc3651c7b6d33accab3e3d4b9816cd3c5714661a84
+  checksum: 4473a79475070d73f2e72f2eaaee5b69d2833b5020faa9714609d95dd03f0e5ad02cad8031a541dcd748436842a300332a2925317b39ffa09e3b4831145d98bc
   languageName: node
   linkType: hard
 
-"@codemirror/view@npm:^6.0.0, @codemirror/view@npm:^6.14.0, @codemirror/view@npm:^6.17.0, @codemirror/view@npm:^6.23.0, @codemirror/view@npm:^6.26.3, @codemirror/view@npm:^6.27.0, @codemirror/view@npm:^6.35.0":
-  version: 6.35.3
-  resolution: "@codemirror/view@npm:6.35.3"
+"@codemirror/view@npm:^6.0.0, @codemirror/view@npm:^6.14.0, @codemirror/view@npm:^6.17.0, @codemirror/view@npm:^6.23.0, @codemirror/view@npm:^6.26.3, @codemirror/view@npm:^6.27.0, @codemirror/view@npm:^6.35.0, @codemirror/view@npm:^6.38.1, @codemirror/view@npm:^6.38.2":
+  version: 6.38.2
+  resolution: "@codemirror/view@npm:6.38.2"
   dependencies:
     "@codemirror/state": ^6.5.0
+    crelt: ^1.0.6
     style-mod: ^4.1.0
     w3c-keyname: ^2.2.4
-  checksum: 09c2685c9345b23ea69d28f323f29d6e73a269e9ffa29ffbf6443c139b2c97fd1a87eced1c59553a3416a08aed3246e30dd5eb70d516159ac352ae422ff4394d
+  checksum: a17d64fcb4cb702f6ee0fda041221a52b4d0ede8e6eae9a3450966cce31be0809687370c80a27524a181895abd594512cd2486b3b207b6f66e6006be163e4800
   languageName: node
   linkType: hard
 
@@ -487,9 +496,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@jupyter/ydoc@npm:^3.0.0":
-  version: 3.0.2
-  resolution: "@jupyter/ydoc@npm:3.0.2"
+"@jupyter/ydoc@npm:^3.0.0, @jupyter/ydoc@npm:^3.1.0":
+  version: 3.1.0
+  resolution: "@jupyter/ydoc@npm:3.1.0"
   dependencies:
     "@jupyterlab/nbformat": ^3.0.0 || ^4.0.0-alpha.21 || ^4.0.0
     "@lumino/coreutils": ^1.11.0 || ^2.0.0
@@ -497,7 +506,7 @@ __metadata:
     "@lumino/signaling": ^1.10.0 || ^2.0.0
     y-protocols: ^1.0.5
     yjs: ^13.5.40
-  checksum: 770f73459635c74bd0e5cacdca1ea1f77ee8efd6e7cd58f0ccbb167ae8374e73118620f4f3628646281160a7bc7389f374bd2106f1e799bdc8f78cad0ce05b28
+  checksum: 7f2423752395ec590ed46754c10c87db4f5b804aa9608ef2869f52872e9a29cb5f9e32908325efb221d9ce4fad642a1f7e0dbb8f2ee40c352b8380e46ccba93d
   languageName: node
   linkType: hard
 
@@ -529,32 +538,32 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@jupyterlab/apputils@npm:^4.4.3":
-  version: 4.4.3
-  resolution: "@jupyterlab/apputils@npm:4.4.3"
-  dependencies:
-    "@jupyterlab/coreutils": ^6.3.3
-    "@jupyterlab/observables": ^5.3.3
-    "@jupyterlab/rendermime-interfaces": ^3.11.3
-    "@jupyterlab/services": ^7.3.3
-    "@jupyterlab/settingregistry": ^4.3.3
-    "@jupyterlab/statedb": ^4.3.3
-    "@jupyterlab/statusbar": ^4.3.3
-    "@jupyterlab/translation": ^4.3.3
-    "@jupyterlab/ui-components": ^4.3.3
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-"abab@npm:^2.0.3, abab@npm:^2.0.5":
+"abab@npm:^2.0.3":
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   resolution: "abab@npm:2.0.6"
   checksum: 6ffc1af4ff315066c62600123990d87551ceb0aafa01e6539da77b0f5987ac7019466780bf480f1787576d4385e3690c81ccc37cfda12819bf510b8ab47e5a3e
@@ -2286,6 +2286,21 @@ __metadata:
   languageName: node
   linkType: hard
 
+"codemirror@npm:^6.0.2":
+  version: 6.0.2
+  resolution: "codemirror@npm:6.0.2"
+  dependencies:
+    "@codemirror/autocomplete": ^6.0.0
+    "@codemirror/commands": ^6.0.0
+    "@codemirror/language": ^6.0.0
+    "@codemirror/lint": ^6.0.0
+    "@codemirror/search": ^6.0.0
+    "@codemirror/state": ^6.0.0
+    "@codemirror/view": ^6.0.0
+  checksum: 3f3111ac586b499798f4f2e2e474cd06ff47dfaa8109077bad33e062fc4845ca362f7009ae73497930ef8d4e6110562da3e16d018553b0f99d4833dc4baf401c
+  languageName: node
+  linkType: hard
+
 "color-convert@npm:^1.9.0":
   version: 1.9.3
   resolution: "color-convert@npm:1.9.3"
@@ -2400,7 +2415,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"crelt@npm:^1.0.5":
+"crelt@npm:^1.0.5, crelt@npm:^1.0.6":
   version: 1.0.6
   resolution: "crelt@npm:1.0.6"
   checksum: dad842093371ad702afbc0531bfca2b0a8dd920b23a42f26e66dabbed9aad9acd5b9030496359545ef3937c3aced0fd4ac39f7a2d280a23ddf9eb7fdcb94a69f
@@ -2468,20 +2483,13 @@ __metadata:
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-"csstype@npm:3.0.10":
+"csstype@npm:3.0.10, csstype@npm:^3.0.2":
   version: 3.0.10
   resolution: "csstype@npm:3.0.10"
   checksum: 20a8fa324f2b33ddf94aa7507d1b6ab3daa6f3cc308888dc50126585d7952f2471de69b2dbe0635d1fdc31223fef8e070842691877e725caf456e2378685a631
   languageName: node
   linkType: hard
 
-"csstype@npm:^3.0.2":
-  version: 3.1.3
-  resolution: "csstype@npm:3.1.3"
-  checksum: 8db785cc92d259102725b3c694ec0c823f5619a84741b5c7991b8ad135dfaa66093038a1cc63e03361a6cd28d122be48f2106ae72334e067dd619a51f49eddf7
-  languageName: node
-  linkType: hard
-
 "data-urls@npm:^2.0.0":
   version: 2.0.0
   resolution: "data-urls@npm:2.0.0"
@@ -3170,21 +3178,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"glob@npm:^7.1.3":
-  version: 7.2.3
-  resolution: "glob@npm:7.2.3"
-  dependencies:
-    fs.realpath: ^1.0.0
-    inflight: ^1.0.4
-    inherits: 2
-    minimatch: ^3.1.1
-    once: ^1.3.0
-    path-is-absolute: ^1.0.0
-  checksum: 29452e97b38fa704dabb1d1045350fb2467cf0277e155aa9ff7077e90ad81d1ea9d53d3ee63bd37c05b09a065e90f16aec4a65f5b8de401d1dac40bc5605d133
-  languageName: node
-  linkType: hard
-
-"glob@npm:~7.1.6":
+"glob@npm:^7.1.3, glob@npm:~7.1.6":
   version: 7.1.7
   resolution: "glob@npm:7.1.7"
   dependencies:
@@ -3709,10 +3703,14 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "jupyterlab-cell-diff@workspace:."
   dependencies:
+    "@codemirror/lang-python": ^6.2.1
+    "@codemirror/merge": ^6.10.2
+    "@codemirror/view": ^6.38.2
     "@jupyterlab/application": ^4.0.0
     "@jupyterlab/builder": ^4.0.0
     "@jupyterlab/cells": ^4.0.0
     "@jupyterlab/codeeditor": ^4.0.0
+    "@jupyterlab/codemirror": ^4.4.7
     "@jupyterlab/coreutils": ^6.0.0
     "@jupyterlab/notebook": ^4.0.0
     "@jupyterlab/services": ^7.0.0
@@ -3723,6 +3721,7 @@ __metadata:
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     "@typescript-eslint/eslint-plugin": ^6.1.0
     "@typescript-eslint/parser": ^6.1.0
+    codemirror: ^6.0.2
     css-loader: ^6.7.1
     eslint: ^8.36.0
     eslint-config-prettier: ^8.8.0
@@ -4074,7 +4073,7 @@ __metadata:
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-"minimatch@npm:^3.0.4, minimatch@npm:^3.0.5, minimatch@npm:^3.1.1, minimatch@npm:^3.1.2":
+"minimatch@npm:^3.0.4, minimatch@npm:^3.0.5, minimatch@npm:^3.1.2":
   version: 3.1.2
   resolution: "minimatch@npm:3.1.2"
   dependencies:
@@ -4985,23 +4984,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"source-map-loader@npm:^1.0.2":
-  version: 1.1.3
-  resolution: "source-map-loader@npm:1.1.3"
-  dependencies:
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-    iconv-lite: ^0.6.2
-    loader-utils: ^2.0.0
-    schema-utils: ^3.0.0
-    source-map: ^0.6.1
-    whatwg-mimetype: ^2.3.0
-  peerDependencies:
-    webpack: ^4.0.0 || ^5.0.0
-  checksum: 0ca16a1458f206e12925f242ce52913b5f35de657d2ec17fd60ab3de7fa85b72b6707951b7a18899bdf05679d679a8b9edeb660c557aafa66453886d6907e3ec
-  languageName: node
-  linkType: hard
-
-"source-map-loader@npm:~1.0.2":
+"source-map-loader@npm:^1.0.2, source-map-loader@npm:~1.0.2":
   version: 1.0.2
   resolution: "source-map-loader@npm:1.0.2"
   dependencies:
@@ -5575,7 +5558,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"vscode-jsonrpc@npm:8.2.0":
+"vscode-jsonrpc@npm:8.2.0, vscode-jsonrpc@npm:^8.0.2":
   version: 8.2.0
   resolution: "vscode-jsonrpc@npm:8.2.0"
   checksum: f302a01e59272adc1ae6494581fa31c15499f9278df76366e3b97b2236c7c53ebfc71efbace9041cfd2caa7f91675b9e56f2407871a1b3c7f760a2e2ee61484a
@@ -5589,13 +5572,6 @@ __metadata:
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   linkType: hard
 
-"vscode-jsonrpc@npm:^8.0.2":
-  version: 8.2.1
-  resolution: "vscode-jsonrpc@npm:8.2.1"
-  checksum: 2af2c333d73f6587896a7077978b8d4b430e55c674d5dbb90597a84a6647057c1655a3bff398a9b08f1f8ba57dbd2deabf05164315829c297b0debba3b8bc19e
-  languageName: node
-  linkType: hard
-
 "vscode-languageserver-protocol@npm:^3.17.0":
   version: 3.17.5
   resolution: "vscode-languageserver-protocol@npm:3.17.5"