add blur command

packages/core/src/commands/blur.ts

@@ -0,0 +1,16 @@
+import { Editor } from '../Editor'
+
+type BlurCommand = () => Editor
+
+declare module '../Editor' {
+  interface Editor {
+    blur: BlurCommand,
+  }
+}
+
+export default (next: Function, { view }: Editor) => () => {
+  const element = view.dom as HTMLElement
+
+  element.blur()
+  next()
+}

packages/core/src/commands/index.ts

@@ -1,3 +1,4 @@
+export { default as blur } from './blur'
 export { default as clearContent } from './clearContent'
 export { default as deleteSelection } from './deleteSelection'
 export { default as focus } from './focus'