diff --git a/README.md b/README.md
index a6eab61..7a19c95 100644
--- a/README.md
+++ b/README.md
@@ -815,8 +815,6 @@ This is the way I construct my JavaScript files.
 ```js
 (function () {
 
-  'use strict';
-
   // Add a js class to the html-tag when JavsScript is active.
   document.querySelector('html').classList.replace('nojs', 'js');
 
@@ -829,8 +827,6 @@ This is the way I construct my JavaScript files.
 ```js
 (function ($) {
 
-  'use strict';
-
   // Add your code here.
   $('html').removeClass('nojs').addClass('js');
 
@@ -842,8 +838,6 @@ This is the way I construct my JavaScript files.
 ```js
 (function ($) {
 
-  'use strict';
-
   // Add your code here.
   $('html').removeClass('nojs').addClass('js');
 
diff --git a/assets/js/contact.js b/assets/js/contact.js
index 025263e..ac7a344 100644
--- a/assets/js/contact.js
+++ b/assets/js/contact.js
@@ -4,9 +4,6 @@
  */
 
 (function () {
-
-  'use strict';
-
   const form = document.querySelector('.contact-form');
   const button = form.querySelector('[type=submit]');
   const action = form.getAttribute('data-protect');
diff --git a/assets/js/cookieconsent.js b/assets/js/cookieconsent.js
index 835a275..c6bd01a 100644
--- a/assets/js/cookieconsent.js
+++ b/assets/js/cookieconsent.js
@@ -4,9 +4,6 @@
  */
 
 (function () {
-
-  'use strict';
-
   const cookiebanner = document.querySelector('.cookieconsent');
   const cookieconsent = localStorage.getItem('cookieconsent');
 
diff --git a/assets/js/math.js b/assets/js/math.js
index 7e2c14e..9129e11 100644
--- a/assets/js/math.js
+++ b/assets/js/math.js
@@ -4,11 +4,7 @@
  */
 
 (function () {
-
-  'use strict';
-
   document.addEventListener('DOMContentLoaded', function () {
-    // eslint-disable-next-line no-undef
     renderMathInElement(document.body, {
       delimiters: [
         {left: '\\[', right: '\\]', display: true},   // block
diff --git a/assets/js/mobile.js b/assets/js/mobile.js
index 7c1851c..228be0d 100644
--- a/assets/js/mobile.js
+++ b/assets/js/mobile.js
@@ -4,9 +4,6 @@
  */
 
 (function () {
-
-  'use strict';
-
   const nav = document.querySelector('.mobile-nav');
   const sheet = document.querySelector('.mobile-nav__sheet');
   const toggle = document.querySelector('.mobile-nav__toggle');
diff --git a/assets/js/script-early.js b/assets/js/script-early.js
index 0f486f5..4364456 100644
--- a/assets/js/script-early.js
+++ b/assets/js/script-early.js
@@ -4,9 +4,6 @@
  */
 
 (function () {
-
-  'use strict';
-
   // Add a js class to the html-tag when JavsScript is active.
   document.querySelector('html').classList.replace('nojs', 'js');
 
diff --git a/assets/js/script.js b/assets/js/script.js
index 78d2859..df1b092 100644
--- a/assets/js/script.js
+++ b/assets/js/script.js
@@ -5,8 +5,6 @@
 
 (function () {
 
-  'use strict';
-
   // Place your code here.
 
 })();
diff --git a/assets/js/search.js b/assets/js/search.js
index 4474026..c8abbf3 100644
--- a/assets/js/search.js
+++ b/assets/js/search.js
@@ -3,15 +3,9 @@
  * A JavaScript file for flexsearch.
  */
 
-/* eslint-disable */
 import * as params from '@params';
-/* eslint-enable */
 
-/* eslint-disable no-undef, guard-for-in */
 (function () {
-
-  'use strict';
-
   const index = new FlexSearch.Document({
     document: {
       id: 'id',
diff --git a/assets/js/tables.js b/assets/js/tables.js
index 282c248..b2650a8 100644
--- a/assets/js/tables.js
+++ b/assets/js/tables.js
@@ -3,11 +3,7 @@
  * A JavaScript file for responsive tables.
  */
 
-/* eslint-disable max-nested-callbacks */
 (function () {
-
-  'use strict';
-
   const tables = document.querySelectorAll('.responsive-table');
 
   tables.forEach(function (table) {
diff --git a/assets/js/tracking.js b/assets/js/tracking.js
index de00fde..43d8b93 100644
--- a/assets/js/tracking.js
+++ b/assets/js/tracking.js
@@ -3,11 +3,8 @@
  * A JavaScript file for analytic tracking.
  */
 
-/* eslint-disable */
 import * as params from '@params';
-/* eslint-enable */
 
-/* eslint-disable no-undef */
 const cookiebanner = params.cookieConsent;
 const cookieconsent = localStorage.getItem('cookieconsent');
 const idSite = params.piwikSiteID;