Add a getter and setter for the undo history state.

Author: drgrice1

package-lock.json

@@ -63,5 +63,8 @@
         "webpack": "^5.106.1",
         "webpack-cli": "^7.0.2",
         "webpack-dev-server": "^5.2.3"
+    },
+    "overrides": {
+        "uuid": "^14.0.0"
     }
 }

package.json

@@ -19,6 +19,7 @@ import {
     CommentTokens,
     defaultKeymap,
     history,
+    historyField,
     historyKeymap,
     indentWithTab,
     toggleLineComment,
@@ -391,6 +392,17 @@ export class View {
             key
         });
     }
+
+    get state() {
+        // eslint-disable-next-line @typescript-eslint/no-unsafe-return
+        return this.view.state.toJSON({ history: historyField });
+    }
+
+    set state(newState) {
+        this.view.setState(
+            EditorState.fromJSON(newState, { doc: this.source, extensions: this.extensions }, { history: historyField })
+        );
+    }
 }
 
 export const runMode = async (source: string, container: HTMLElement) => {