diff --git a/common/eslint-local-rules/__tests__/matchingTranslationKeys.spec.js b/common/eslint-local-rules/__tests__/matchingTranslationKeys.spec.js
index 342c3c94052..8d0405be0e4 100644
--- a/common/eslint-local-rules/__tests__/matchingTranslationKeys.spec.js
+++ b/common/eslint-local-rules/__tests__/matchingTranslationKeys.spec.js
@@ -1,11 +1,9 @@
-import rule from '../matchingTranslationKeys.js'
+import { matchingTranslationKeys } from '../matchingTranslationKeys.js'
 import { RuleTester } from 'eslint'
-import path from 'path'
-import fs from 'fs'
-import utils from 'eslint-plugin-vue/lib/utils/index.js'
 import { describe, it } from 'vitest'
 import localRules from 'eslint-plugin-local-rules'
 import globals from 'globals'
+import utils from 'eslint-plugin-vue/lib/utils/index.js'
 import eslintParser from 'vue-eslint-parser'
 
 RuleTester.describe = describe
@@ -28,7 +26,7 @@ const ruleTester = new RuleTester({
     },
   },
 })
-const ruleInstance = rule(path, utils, fs)
+const ruleInstance = matchingTranslationKeys(utils)
 
 const options = [
   {
diff --git a/common/eslint-local-rules/matchingTranslationKeys.js b/common/eslint-local-rules/matchingTranslationKeys.js
index fbfbc80edd5..ec3dc952896 100644
--- a/common/eslint-local-rules/matchingTranslationKeys.js
+++ b/common/eslint-local-rules/matchingTranslationKeys.js
@@ -1,5 +1,7 @@
-module.exports = (path, utils, fs) => {
-  const { packageDirectory } = require('./packageDirectory.js')(path, fs)
+import { packageDirectory } from "./packageDirectory.js"
+import path from "path"
+
+export default function createMatchingTranslationKeys(utils) {
 
   /**
    * Convert a file path to our convention for translation key structures
diff --git a/common/eslint-local-rules/packageDirectory.js b/common/eslint-local-rules/packageDirectory.js
index ea4faf4093c..01bdca54685 100644
--- a/common/eslint-local-rules/packageDirectory.js
+++ b/common/eslint-local-rules/packageDirectory.js
@@ -1,5 +1,7 @@
-module.exports = (path, fs) => ({
-  packageDirectory: function (filename) {
+import path from "path";
+import fs from "fs";
+
+export function packageDirectory(filename) {
     const { root } = path.parse(filename)
 
     let directory = filename
@@ -16,5 +18,4 @@ module.exports = (path, fs) => ({
     }
 
     return ''
-  },
-})
+}
diff --git a/frontend/babel.config.js b/frontend/babel.config.js
index cbadcc09f9b..2b8a72a2f46 100644
--- a/frontend/babel.config.js
+++ b/frontend/babel.config.js
@@ -1,8 +1,7 @@
-module.exports = {
-  presets: ['@vue/app'],
-  env: {
-    test: {
-      plugins: ['require-context-hook'],
-    },
+// noinspection JSUnusedGlobalSymbols
+export const presets = ['@vue/app']
+export const env = {
+  test: {
+    plugins: ['require-context-hook'],
   },
 }
diff --git a/frontend/docker-setup.sh b/frontend/docker-setup.sh
index 8f31586a220..91dd9c4dd9a 100755
--- a/frontend/docker-setup.sh
+++ b/frontend/docker-setup.sh
@@ -4,10 +4,10 @@ set -euo pipefail
 BASEDIR=$(dirname "$0")
 PDF_DIST=$BASEDIR"/src/pdf"
 
-if [ ! -f "$PDF_DIST/pdf.mjs" ] || [ ! -f "$PDF_DIST/prepareInMainThread.mjs" ]; then
+if [ ! -f "$PDF_DIST/pdf.js" ] || [ ! -f "$PDF_DIST/prepareInMainThread.js" ]; then
     # Copy dummy versions of the pdf build outputs, to make sure there is always something to import
-    cp "$PDF_DIST/pdf.mjs.dist" "$PDF_DIST/pdf.mjs"
-    cp "$PDF_DIST/prepareInMainThread.mjs.dist" "$PDF_DIST/prepareInMainThread.mjs"
+    cp "$PDF_DIST/pdf.js.dist" "$PDF_DIST/pdf.js"
+    cp "$PDF_DIST/prepareInMainThread.js.dist" "$PDF_DIST/prepareInMainThread.js"
 fi
 
 if [ "$CI" = 'true' ] ; then
diff --git a/frontend/eslint-local-rules/index.js b/frontend/eslint-local-rules/index.js
index 7da60a12f91..0431dd1383f 100644
--- a/frontend/eslint-local-rules/index.js
+++ b/frontend/eslint-local-rules/index.js
@@ -1,8 +1,6 @@
-const path = require('path')
-const fs = require('fs')
-const utils = require('eslint-plugin-vue/lib/utils/index.js')
-const matchingTranslationKeys = require('../src/common/eslint-local-rules/matchingTranslationKeys.js')
+import utils from 'eslint-plugin-vue/lib/utils/index.js'
+// noinspection ES6UnusedImports
+import createMatchingTranslationKeys from '../../common/eslint-local-rules/matchingTranslationKeys.js'
 
-module.exports = {
-  'matching-translation-keys': matchingTranslationKeys(path, utils, fs),
-}
+// noinspection JSUnusedGlobalSymbols
+export const matchingTranslationKeys = createMatchingTranslationKeys(utils)
diff --git a/frontend/eslint.config.mjs b/frontend/eslint.config.mjs
index 9d959b3c5f8..3296272992a 100644
--- a/frontend/eslint.config.mjs
+++ b/frontend/eslint.config.mjs
@@ -77,7 +77,7 @@ export default [
         },
       ],
 
-      'local-rules/matching-translation-keys': [
+      'local-rules/matchingTranslationKeys': [
         'error',
         {
           ignoreKeysRegex:
diff --git a/frontend/package.json b/frontend/package.json
index 498d7a85489..3f9f1e86059 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,6 +1,7 @@
 {
   "name": "@ecamp3/frontend",
   "private": true,
+  "type": "module",
   "scripts": {
     "serve": "vite --host 0.0.0.0",
     "preview": "vite preview --host 0.0.0.0 --port 3000",
diff --git a/frontend/src/components/print/print-client/generatePdf.js b/frontend/src/components/print/print-client/generatePdf.js
index 67a533c8c1e..f1f20e9959d 100644
--- a/frontend/src/components/print/print-client/generatePdf.js
+++ b/frontend/src/components/print/print-client/generatePdf.js
@@ -1,4 +1,4 @@
-import { prepareInMainThread } from '@/pdf/prepareInMainThread.mjs'
+import { prepareInMainThread } from '@/pdf/prepareInMainThread.js'
 import cloneDeep from 'lodash/cloneDeep.js'
 
 export const generatePdf = async (data) => {
diff --git a/frontend/src/components/print/print-client/renderPdf.js b/frontend/src/components/print/print-client/renderPdf.js
index 60acd6235c9..b9ee20d80a7 100644
--- a/frontend/src/components/print/print-client/renderPdf.js
+++ b/frontend/src/components/print/print-client/renderPdf.js
@@ -1,6 +1,6 @@
 import wrap from './minimalHalJsonVuex.js'
 import createI18n from './i18n.js'
-import { render, prepare } from '@/pdf/pdf.mjs'
+import { render, prepare } from '@/pdf/pdf.js'
 
 export const renderPdf = async ({ config, storeData, translationData }) => {
   const result = {
diff --git a/frontend/vue.config.js b/frontend/vue.config.js
index c6ceaf66181..2c74438f9d0 100644
--- a/frontend/vue.config.js
+++ b/frontend/vue.config.js
@@ -1,25 +1,25 @@
-module.exports = {
+export const pluginOptions = {
+  jestSerializer: {
+    attributesToClear: ['id', 'for'],
+    formatting: {
+      indent_char: ' ',
+      indent_inner_html: true,
+      indent_size: 5,
+      inline: [],
+      sep: '\n',
+      wrap_attributes: 'force-aligned',
+    },
+  },
+}
+
+export default {
   devServer: {
     useLocalIp: false,
     allowedHosts: ['ecamp3', 'localhost', '127.0.0.1'],
   },
 
   transpileDependencies: ['vuetify'],
-
-  pluginOptions: {
-    jestSerializer: {
-      attributesToClear: ['id', 'for'],
-      formatting: {
-        indent_char: ' ',
-        indent_inner_html: true,
-        indent_size: 5,
-        inline: [],
-        sep: '\n',
-        wrap_attributes: 'force-aligned',
-      },
-    },
-  },
-
+  pluginOptions,
   css: {
     sourceMap: true,
   },
diff --git a/pdf/.gitignore b/pdf/.gitignore
index be1616bf10b..4cf9e4833b1 100644
--- a/pdf/.gitignore
+++ b/pdf/.gitignore
@@ -9,7 +9,8 @@ lerna-debug.log*
 
 node_modules
 .DS_Store
-dist
+/dist/*
+!/dist/*.dist
 dist-ssr
 coverage
 *.local
diff --git a/pdf/babel.config.js b/pdf/babel.config.js
index cbadcc09f9b..2b8a72a2f46 100644
--- a/pdf/babel.config.js
+++ b/pdf/babel.config.js
@@ -1,8 +1,7 @@
-module.exports = {
-  presets: ['@vue/app'],
-  env: {
-    test: {
-      plugins: ['require-context-hook'],
-    },
+// noinspection JSUnusedGlobalSymbols
+export const presets = ['@vue/app']
+export const env = {
+  test: {
+    plugins: ['require-context-hook'],
   },
 }
diff --git a/pdf/dist/pdf.mjs.dist b/pdf/dist/pdf.js.dist
similarity index 100%
rename from pdf/dist/pdf.mjs.dist
rename to pdf/dist/pdf.js.dist
diff --git a/pdf/dist/prepareInMainThread.mjs.dist b/pdf/dist/prepareInMainThread.js.dist
similarity index 100%
rename from pdf/dist/prepareInMainThread.mjs.dist
rename to pdf/dist/prepareInMainThread.js.dist
diff --git a/pdf/eslint-local-rules/index.js b/pdf/eslint-local-rules/index.js
index fa20d58d4dc..0431dd1383f 100644
--- a/pdf/eslint-local-rules/index.js
+++ b/pdf/eslint-local-rules/index.js
@@ -1,8 +1,6 @@
-const path = require('path')
-const fs = require('fs')
-const utils = require('eslint-plugin-vue/lib/utils/index.js')
-const matchingTranslationKeys = require('../common/eslint-local-rules/matchingTranslationKeys.js')
+import utils from 'eslint-plugin-vue/lib/utils/index.js'
+// noinspection ES6UnusedImports
+import createMatchingTranslationKeys from '../../common/eslint-local-rules/matchingTranslationKeys.js'
 
-module.exports = {
-  'matching-translation-keys': matchingTranslationKeys(path, utils, fs),
-}
+// noinspection JSUnusedGlobalSymbols
+export const matchingTranslationKeys = createMatchingTranslationKeys(utils)
diff --git a/pdf/eslint.config.mjs b/pdf/eslint.config.mjs
index 91fd7649ef0..0fb22597995 100644
--- a/pdf/eslint.config.mjs
+++ b/pdf/eslint.config.mjs
@@ -73,7 +73,7 @@ export default [
         },
       ],
 
-      'local-rules/matching-translation-keys': [
+      'local-rules/matchingTranslationKeys': [
         'error',
         {
           ignoreKeysRegex:
diff --git a/pdf/package.json b/pdf/package.json
index 4ad2a030262..4ef8601cf13 100644
--- a/pdf/package.json
+++ b/pdf/package.json
@@ -1,6 +1,7 @@
 {
   "name": "@ecamp3/client-pdf",
   "description": "Create pdfs for eCamp, using Vue components",
+  "type": "module",
   "main": "src/index.js",
   "private": true,
   "scripts": {
diff --git a/print/eslint-local-rules/index.js b/print/eslint-local-rules/index.js
index 7ec246a27da..0431dd1383f 100644
--- a/print/eslint-local-rules/index.js
+++ b/print/eslint-local-rules/index.js
@@ -1,8 +1,6 @@
-const path = require('path')
-const fs = require('fs')
-const utils = require('eslint-plugin-vue/lib/utils/index.js')
-const matchingTranslationKeys = require('../../common/eslint-local-rules/matchingTranslationKeys.js')
+import utils from 'eslint-plugin-vue/lib/utils/index.js'
+// noinspection ES6UnusedImports
+import createMatchingTranslationKeys from '../../common/eslint-local-rules/matchingTranslationKeys.js'
 
-module.exports = {
-  'matching-translation-keys': matchingTranslationKeys(path, utils, fs),
-}
+// noinspection JSUnusedGlobalSymbols
+export const matchingTranslationKeys = createMatchingTranslationKeys(utils)
diff --git a/print/eslint.config.mjs b/print/eslint.config.mjs
index 377a195b9db..272deb64b97 100644
--- a/print/eslint.config.mjs
+++ b/print/eslint.config.mjs
@@ -51,7 +51,7 @@ export default [
       'prefer-const': 'error',
       'vue/multi-word-component-names': 'off',
 
-      'local-rules/matching-translation-keys': [
+      'local-rules/matchingTranslationKeys': [
         'error',
         {
           ignoreKeysRegex:
diff --git a/print/package.json b/print/package.json
index 2ca28f1e228..98f2aefc174 100644
--- a/print/package.json
+++ b/print/package.json
@@ -1,6 +1,7 @@
 {
   "name": "@ecamp3/backend-print",
   "private": true,
+  "type": "module",
   "scripts": {
     "dev": "nuxt dev",
     "dev-debug": "node --inspect node_modules/.bin/nuxt",