Refactor code-style

Author: wooorm

index.js

@@ -29,7 +29,7 @@ export function shiftHeading(tree, shift) {
 
   /** @type {VisitElement} */
   function visitor(node) {
-    var rank = headingRank(node)
+    let rank = headingRank(node)
 
     if (rank) {
       rank += shift

package.json

@@ -71,11 +71,7 @@
     "trailingComma": "none"
   },
   "xo": {
-    "prettier": true,
-    "rules": {
-      "no-var": "off",
-      "prefer-arrow-callback": "off"
-    }
+    "prettier": true
   },
   "remarkConfig": {
     "plugins": [

readme.md

@@ -27,7 +27,7 @@ npm install hast-util-shift-heading
 import {h} from 'hastscript'
 import {shiftHeading} from 'hast-util-shift-heading'
 
-var tree = h('main', [
+const tree = h('main', [
   h('h1', 'Alpha'),
   h('p', 'Bravo'),
   h('h2', 'Charlie'),

test.js

@@ -2,9 +2,9 @@ import test from 'tape'
 import {h} from 'hastscript'
 import {shiftHeading} from './index.js'
 
-test('shiftHeading', function (t) {
+test('shiftHeading', (t) => {
   t.throws(
-    function () {
+    () => {
       // @ts-ignore runtime.
       shiftHeading(h(''))
     },
@@ -13,31 +13,31 @@ test('shiftHeading', function (t) {
   )
 
   t.throws(
-    function () {
+    () => {
       shiftHeading(h(''), Number.NaN)
     },
     /^Error: Expected a non-null finite integer, not `NaN`$/,
     'should throw when given not a number'
   )
 
   t.throws(
-    function () {
+    () => {
       shiftHeading(h(''), 0.1)
     },
     /^Error: Expected a non-null finite integer, not `0.1`$/,
     'should throw when not given an integer'
   )
 
   t.throws(
-    function () {
+    () => {
       shiftHeading(h(''), Number.POSITIVE_INFINITY)
     },
     /^Error: Expected a non-null finite integer, not `Infinity`$/,
     'should throw when not given a finite number'
   )
 
   t.throws(
-    function () {
+    () => {
       shiftHeading(h(''), 0)
     },
     /^Error: Expected a non-null finite integer, not `0`$/,