Refactor code-style

Author: wooorm

index.js

@@ -11,8 +11,8 @@ function enterMdxjsEsm(token) {
 }
 
 function exitMdxjsEsm(token) {
-  var value = this.resume()
-  var node = this.exit(token)
+  const value = this.resume()
+  const node = this.exit(token)
 
   node.value = value
 

package.json

@@ -62,11 +62,7 @@
     "trailingComma": "none"
   },
   "xo": {
-    "prettier": true,
-    "rules": {
-      "no-var": "off",
-      "prefer-arrow-callback": "off"
-    }
+    "prettier": true
   },
   "remarkConfig": {
     "plugins": [

test.js

@@ -6,7 +6,7 @@ import {removePosition} from 'unist-util-remove-position'
 import mdxjsEsm from 'micromark-extension-mdxjs-esm'
 import {mdxjsEsmFromMarkdown, mdxjsEsmToMarkdown} from './index.js'
 
-test('markdown -> mdast', function (t) {
+test('markdown -> mdast', (t) => {
   t.deepEqual(
     fromMarkdown('import a from "b"\nexport var c = ""\n\nd', {
       extensions: [mdxjsEsm({acorn})],
@@ -194,7 +194,7 @@ test('markdown -> mdast', function (t) {
   t.end()
 })
 
-test('mdast -> markdown', function (t) {
+test('mdast -> markdown', (t) => {
   t.deepEqual(
     toMarkdown(
       {