Use ESM

index.js

@@ -1,19 +1,15 @@
-'use strict'
-
-var visit = require('unist-util-visit')
-var toString = require('nlcst-to-string')
-var syllable = require('syllable')
-var daleChall = require('dale-chall')
-var spache = require('spache')
-var daleChallFormula = require('dale-chall-formula')
-var ari = require('automated-readability')
-var colemanLiau = require('coleman-liau')
-var flesch = require('flesch')
-var smog = require('smog-formula')
-var gunningFog = require('gunning-fog')
-var spacheFormula = require('spache-formula')
-
-module.exports = readability
+import visit from 'unist-util-visit'
+import toString from 'nlcst-to-string'
+import syllable from 'syllable'
+import {daleChall} from 'dale-chall'
+import {spache} from 'spache'
+import daleChallFormula from 'dale-chall-formula'
+import ari from 'automated-readability'
+import colemanLiau from 'coleman-liau'
+import flesch from 'flesch'
+import smog from 'smog-formula'
+import gunningFog from 'gunning-fog'
+import spacheFormula from 'spache-formula'
 
 var origin = 'retext-readability:readability'
 var defaultTargetAge = 16
@@ -26,7 +22,7 @@ var round = Math.round
 var ceil = Math.ceil
 var sqrt = Math.sqrt
 
-function readability(options) {
+export default function retextReadability(options) {
   var settings = options || {}
   var targetAge = settings.age || defaultTargetAge
   var threshold = settings.threshold || defaultThreshold
@@ -58,8 +54,8 @@ function readability(options) {
 
       if (wordCount >= minWords) {
         counts = {
-          complexPolysillabicWord: complexPolysillabicWord,
-          polysillabicWord: polysillabicWord,
+          complexPolysillabicWord,
+          polysillabicWord,
           unfamiliarWord: wordCount - familiarWordCount,
           difficultWord: wordCount - easyWordCount,
           syllable: totalSyllables,

package.json

@@ -38,19 +38,22 @@
     "Josiah Sprague <josiah.sprague@gmail.com>",
     "Sylvan Swierkosz <sswierkosz@gmail.com>"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
     "index.js"
   ],
   "dependencies": {
     "automated-readability": "^1.0.0",
     "coleman-liau": "^1.0.0",
-    "dale-chall": "^1.0.0",
+    "dale-chall": "^2.0.0",
     "dale-chall-formula": "^1.0.0",
     "flesch": "^1.0.0",
     "gunning-fog": "^1.0.0",
     "nlcst-to-string": "^2.0.0",
     "smog-formula": "^1.0.0",
-    "spache": "^1.1.0",
+    "spache": "^2.0.0",
     "spache-formula": "^1.0.0",
     "syllable": "^4.0.0",
     "unist-util-visit": "^2.0.0"
@@ -62,7 +65,7 @@
     "remark-preset-wooorm": "^8.0.0",
     "retext": "^7.0.0",
     "tape": "^5.0.0",
-    "xo": "^0.37.0"
+    "xo": "^0.39.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
@@ -80,8 +83,9 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
     "rules": {
+      "no-var": "off",
+      "prefer-arrow-callback": "off",
       "unicorn/no-array-callback-reference": "off",
       "unicorn/prefer-includes": "off"
     }

test.js

@@ -1,8 +1,6 @@
-'use strict'
-
-var test = require('tape')
-var retext = require('retext')
-var readability = require('.')
+import test from 'tape'
+import retext from 'retext'
+import readability from './index.js'
 
 test('readability', function (t) {
   retext()