Use ESM

.gitignore

@@ -1,8 +1,5 @@
 .DS_Store
 *.log
-.nyc_output/
 coverage/
 node_modules/
-smog-formula.js
-smog-formula.min.js
 yarn.lock

.prettierignore

@@ -1,4 +1,2 @@
 coverage/
-smog-formula.js
-smog-formula.min.js
 *.md

index.js

@@ -1,15 +1,11 @@
-'use strict'
-
-module.exports = smog
-
 var sentenceSize = 30
 var weight = 1.043
 var base = 3.1291
 
 // Get the grade level of a given value according to the SMOG formula.
 // More information is available at WikiPedia:
 // <https://en.wikipedia.org/wiki/SMOG>
-function smog(counts) {
+export function smogFormula(counts) {
   if (!counts || !counts.sentence) {
     return Number.NaN
   }

package.json

@@ -22,27 +22,25 @@
   "contributors": [
     "Titus Wormer <[email protected]> (https://wooorm.com)"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
     "index.js"
   ],
   "devDependencies": {
-    "browserify": "^17.0.0",
-    "nyc": "^15.0.0",
+    "c8": "^7.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^9.0.0",
     "remark-preset-wooorm": "^8.0.0",
     "tape": "^5.0.0",
-    "tinyify": "^3.0.0",
     "xo": "^0.38.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "build-bundle": "browserify . -s smogFormula -o smog-formula.js",
-    "build-mangle": "browserify . -s smogFormula -p tinyify -o smog-formula.min.js",
-    "build": "npm run build-bundle && npm run build-mangle",
-    "test-api": "node test",
-    "test-coverage": "nyc --reporter lcov tape test.js",
-    "test": "npm run format && npm run build && npm run test-coverage"
+    "test-api": "node test.js",
+    "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov node test.js",
+    "test": "npm run format && npm run test-coverage"
   },
   "prettier": {
     "tabWidth": 2,
@@ -54,10 +52,10 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
-    "ignores": [
-      "smog-formula.js"
-    ]
+    "rules": {
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
+    }
   },
   "remarkConfig": {
     "plugins": [

readme.md

@@ -12,6 +12,9 @@ See [`syllable`][syllable] for detecting syllables.
 
 ## Install
 
+This package is ESM only: Node 12+ is needed to use it and it must be `import`ed
+instead of `require`d.
+
 [npm][]:
 
 ```sh
@@ -21,7 +24,7 @@ npm install smog-formula
 ## Use
 
 ```js
-var smogFormula = require('smog-formula')
+import {smogFormula} from 'smog-formula'
 
 // For “The Australian platypus is seemingly a hybrid of a mammal and reptilian
 // creature.” (1 sentence; 4 polysillabic words).
@@ -31,6 +34,9 @@ smogFormula({sentence: 1, polysillabicWord: 4})
 
 ## API
 
+This package exports the following identifiers: `smogFormula`.
+There is no default export.
+
 ### `smogFormula(counts)`
 
 Given an object containing the number of sentences (`sentence`) and the number

test.js

@@ -1,12 +1,10 @@
-'use strict'
-
-var test = require('tape')
-var smog = require('.')
+import test from 'tape'
+import {smogFormula} from './index.js'
 
 test('smogFormula', function (t) {
-  t.ok(Number.isNaN(smog()), 'NaN when an invalid value is given')
-  t.equal(round(smog({sentence: 1})), 3.1291)
-  t.equal(round(smog({sentence: 1, polysillabicWord: 4})), 14.554593)
+  t.ok(Number.isNaN(smogFormula()), 'NaN when an invalid value is given')
+  t.equal(round(smogFormula({sentence: 1})), 3.1291)
+  t.equal(round(smogFormula({sentence: 1, polysillabicWord: 4})), 14.554593)
   t.end()
 })