add selectall command

packages/core/src/Editor.ts

@@ -72,6 +72,7 @@ export class Editor extends EventEmitter {
     this.registerCommand('clearContent', require('./commands/clearContent').default)
     this.registerCommand('removeMarks', require('./commands/removeMarks').default)
     this.registerCommand('toggleBlockType', require('./commands/toggleBlockType').default)
+    this.registerCommand('selectAll', require('./commands/selectAll').default)
     
     if (this.options.injectCSS) {
       require('./style.css')

packages/core/src/commands/selectAll.ts

@@ -0,0 +1,15 @@
+import { Editor } from '../Editor'
+import { selectAll } from 'prosemirror-commands'
+
+type SelectAll = () => any
+
+declare module '../Editor' {
+  interface Editor {
+    selectAll: SelectAll,
+  }
+}
+
+export default (next: Function, { state, view }: Editor): SelectAll => () => {
+  selectAll(state, view.dispatch)
+  next()
+}