feat: Add extension storage (#2069)

packages/core/src/Editor.ts

@@ -50,6 +50,8 @@ export class Editor extends EventEmitter<EditorEvents> {
 
   public isFocused = false
 
+  public extensionStorage: Record<string, any> = {}
+
   public options: EditorOptions = {
     element: document.createElement('div'),
     content: '',
@@ -100,6 +102,13 @@ export class Editor extends EventEmitter<EditorEvents> {
     }, 0)
   }
 
+  /**
+   * Returns the editor storage.
+   */
+  public get storage(): Record<string, any> {
+    return this.extensionStorage
+  }
+
   /**
    * An object of all registered commands.
    */