feat: switch from CommonJS to ESM

browser.js

@@ -1,4 +1,4 @@
-const { PDFDocument } = require('pdf-lib')
+import { PDFDocument } from 'pdf-lib'
 
 const globalObject =
   typeof globalThis === 'object'
@@ -9,7 +9,7 @@ const globalObject =
         ? self // Worker
         : this
 
-class PDFMerger {
+export default class PDFMerger {
   constructor () {
     this.reset()
 
@@ -167,5 +167,3 @@ class PDFMerger {
     link.click()
   }
 }
-
-module.exports = PDFMerger

index.js

@@ -1,7 +1,7 @@
-const { PDFDocument } = require('pdf-lib')
-const fs = require('fs').promises
+import { PDFDocument } from 'pdf-lib'
+import fs from 'fs/promises'
 
-class PDFMerger {
+export default class PDFMerger {
   constructor () {
     this.reset()
 
@@ -122,5 +122,3 @@ class PDFMerger {
     return Buffer.from(uInt8Array)
   }
 }
-
-module.exports = PDFMerger

package.json

@@ -2,14 +2,18 @@
   "name": "pdf-merger-js",
   "version": "4.3.1",
   "description": "merge multiple PDF documents, or parts of them, to a new PDF document",
+  "type": "module",
+  "engines": {
+    "node": ">=14"
+  },
   "main": "./index.js",
   "types": "./index.d.ts",
   "browser": "./browser.js",
   "scripts": {
     "standard": "standard",
     "standard:fix": "standard --fix",
-    "test": "jest --detectOpenHandles",
-    "test:watch": "jest --watch --forceExit --detectOpenHandles"
+    "test": "node --experimental-vm-modules node_modules/jest/bin/jest --detectOpenHandles",
+    "test:watch": "node --experimental-vm-modules node_modules/jest/bin/jest.js --watch --forceExit --detectOpenHandles"
   },
   "standard": {
     "env": [

test/browser-fixtures.test.js

@@ -2,19 +2,22 @@
  * @jest-environment jsdom
  */
 
-const path = require('path')
-const fs = require('fs-extra')
-const pdfDiff = require('pdf-diff')
-const fetch = require('node-fetch')
+import path from 'path'
+import fs from 'fs-extra'
+import pdfDiff from 'pdf-diff'
+import fetch from 'node-fetch'
+import { jest } from '@jest/globals'
+
+import PDFMerger from '../browser'
+
 /*
   add a global `windows.fetch` to mock fetch
 */
 global.window.fetch = jest.fn().mockImplementation((requestUrl) => {
   return Promise.resolve(fetch(requestUrl))
 })
 
-const PDFMerger = require('../browser')
-
+const __dirname = path.dirname(new URL(import.meta.url).pathname)
 const FIXTURES_DIR = path.join(__dirname, 'fixtures')
 const TMP_DIR = path.join(__dirname, 'tmp')
 

test/fixtures.test.js

@@ -1,10 +1,12 @@
-const path = require('path')
-const fs = require('fs-extra')
-const pdfDiff = require('pdf-diff')
-const { PDFDocument } = require('pdf-lib')
+import path from 'path'
+import fs from 'fs-extra'
+import pdfDiff from 'pdf-diff'
+import { PDFDocument } from 'pdf-lib'
+import { jest } from '@jest/globals'
 
-const PDFMerger = require('../index')
+import PDFMerger from '../index'
 
+const __dirname = path.dirname(new URL(import.meta.url).pathname)
 const FIXTURES_DIR = path.join(__dirname, 'fixtures')
 const TMP_DIR = path.join(__dirname, 'tmp')
 

test/issues.test.js

@@ -1,8 +1,10 @@
-const path = require('path')
-const fs = require('fs-extra')
+import path from 'path'
+import fs from 'fs-extra'
+import { jest } from '@jest/globals'
 
-const PDFMerger = require('../index')
+import PDFMerger from '../index'
 
+const __dirname = path.dirname(new URL(import.meta.url).pathname)
 const FIXTURES_DIR = path.join(__dirname, 'fixtures')
 const TMP_DIR = path.join(__dirname, 'tmp')