Update dependencies

index.js

@@ -1,12 +1,9 @@
-'use strict'
+import yaml from 'js-yaml'
 
-var yaml = require('js-yaml')
 var warningIssued
 
-module.exports = yamlConfig
-
 // Modify remark to read configuration from comments.
-function yamlConfig() {
+export default function remarkYamlConfig() {
   var data = this.data()
 
   // Old remark.

package.json

@@ -26,11 +26,14 @@
   "contributors": [
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
     "index.js"
   ],
   "dependencies": {
-    "js-yaml": "^3.5.2"
+    "js-yaml": "^3.0.0"
   },
   "devDependencies": {
     "c8": "^7.0.0",
@@ -62,6 +65,8 @@
     "prettier": true,
     "esnext": false,
     "rules": {
+      "no-var": "off",
+      "prefer-arrow-callback": "off",
       "guard-for-in": "off",
       "no-eq-null": "off",
       "eqeqeq": "off"

test.js

@@ -1,11 +1,9 @@
-'use strict'
-
-var test = require('tape')
-var unified = require('unified')
-var remark = require('remark')
-var frontmatter = require('remark-frontmatter')
-var html = require('remark-html')
-var yamlConfig = require('.')
+import test from 'tape'
+import unified from 'unified'
+import remark from 'remark'
+import frontmatter from 'remark-frontmatter'
+import html from 'remark-html'
+import yamlConfig from './index.js'
 
 test('remark-yaml-config', function (t) {
   t.equal(