add autofocus option

packages/core/src/Editor.ts

@@ -54,6 +54,7 @@ interface EditorOptions {
   content: EditorContent
   extensions: (Extension | Node | Mark)[]
   injectCSS: Boolean,
+  autoFocus: 'start' | 'end' | number | boolean | null
 }
 
 @magicMethods
@@ -73,6 +74,7 @@ export class Editor extends EventEmitter {
     content: '',
     injectCSS: true,
     extensions: [],
+    autoFocus: false,
   }
   public isFocused = false
   public isEditable = true
@@ -104,6 +106,8 @@ export class Editor extends EventEmitter {
     if (this.options.injectCSS) {
       require('./style.css')
     }
+    
+    this.proxy.focus(this.options.autoFocus)
   }
 
   private __get(name: string) {

packages/core/src/commands/focus.ts

@@ -16,14 +16,14 @@ interface ResolvedSelection {
   to: number,
 }
 
-type Position = 'start' | 'end' | number | null
+type Position = 'start' | 'end' | number | boolean | null
 
 function resolveSelection(editor: Editor, position: Position = null): ResolvedSelection {
   if (position === null) {
     return editor.selection
   }
 
-  if (position === 'start') {
+  if (position === 'start' || position === true) {
     return {
       from: 0,
       to: 0,
@@ -48,7 +48,7 @@ function resolveSelection(editor: Editor, position: Position = null): ResolvedSe
 export default (next: Function, editor: Editor) => async (position = null) => {
   const { view, state } = editor
 
-  if ((view.hasFocus() && position === null)) {
+  if ((view.hasFocus() && position === null) || position === false) {
     next()
     return
   }