fix: add type isDestroyed for prosemirror-view (DefinitelyTyped#5…

…8084)

types/prosemirror-view/index.d.ts

@@ -1,11 +1,12 @@
-// Type definitions for prosemirror-view 1.19
+// Type definitions for prosemirror-view 1.23
 // Project: https://github.com/ProseMirror/prosemirror-view
 // Definitions by: Bradley Ayers <https://github.com/bradleyayers>
 //                 David Hahn <https://github.com/davidka>
 //                 Tim Baumann <https://github.com/timjb>
 //                 Patrick Simmelbauer <https://github.com/patsimm>
 //                 Ifiok Jr. <https://github.com/ifiokjr>
 //                 Mike Morearty <https://github.com/mmorearty>
+//                 Ocavue <https://github.com/ocavue>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 3.0
 
@@ -367,6 +368,12 @@ export class EditorView<S extends Schema = any> {
      * views](#view.NodeView).
      */
     destroy(): void;
+    /**
+     * This is true when the view has been
+     * [destroyed](#view.EditorView.destroy) (and thus should not be
+     * used anymore).
+     */
+    isDestroyed: boolean;
     /**
      * Dispatch a transaction. Will call
      * [`dispatchTransaction`](#view.DirectEditorProps.dispatchTransaction)