editor: fix error Cannot find name 'Writeable'

packages/editor/src/extensions/image/image.ts

@@ -31,6 +31,8 @@ import { createSelectionBasedNodeView } from "../react";
 import { TextDirections } from "../text-direction";
 import { ImageComponent } from "./component";
 
+type Writeable<T> = { -readonly [P in keyof T]: T[P] };
+
 export interface ImageOptions {
   inline: boolean;
   allowBase64: boolean;