Replace gulp with plain npm for linting.

assets/js/cookieconsent.js

@@ -1,3 +1,4 @@
+/* eslint-disable no-undef */
 (function () {
 
   'use strict';

assets/js/script.js

@@ -3,10 +3,10 @@
  * A JavaScript file for the theme.
  */
 
-(function ($) {
+(function () {
 
   'use strict';
 
   // Place your code here.
 
-})(u);
+})();

assets/js/search.js

@@ -1,3 +1,5 @@
+/* eslint-disable no-undef */
+
 /**
  * @file
  * A JavaScript file for flexsearch.
@@ -36,7 +38,7 @@
     results.appendChild(fragment);
   }
 
-  function doSearch () {
+  function doSearch() {
     const query = document.querySelector('.search-text').value.trim();
     const results = flexSearch.search({
       query: query,
@@ -45,21 +47,21 @@
     showResults(results);
   }
 
-  function enableUI () {
+  function enableUI() {
     const searchform = document.querySelector('.search-form');
     searchform.addEventListener('submit', function (e) {
       e.preventDefault();
       doSearch();
-    })
+    });
     searchform.addEventListener('keyup', function () {
       doSearch();
-    })
+    });
     document.querySelector('.search-loading').classList.add('hidden');
     document.querySelector('.search-input').classList.remove('hidden');
     document.querySelector('.search-text').focus();
   }
 
-  function buildIndex () {
+  function buildIndex() {
     document.querySelector('.search-loading').classList.remove('hidden');
     fetch('/searchindex.json')
       .then(function (response) {

assets/js/tracking.js

@@ -1,3 +1,5 @@
+/* eslint-disable no-undef */
+
 /**
  * @file
  * A JavaScript file for analytic tracking.

assets/sass/_custom.scss

@@ -1,3 +1,3 @@
-// sass-lint:disable no-css-comments, no-color-hex, no-color-literals
+// stylelint-disable color-no-hex, color-named
 
 // Site custom styles

assets/sass/_zen.scss

@@ -83,7 +83,6 @@ aside {
 }
 
 article {
-
   & > header {
     color: $text-meta;
   }

assets/sass/base/document/_document.scss

@@ -1,4 +1,4 @@
-// sass-lint:disable no-vendor-prefixes
+// stylelint-disable property-no-vendor-prefix
 
 // Document
 //

assets/sass/base/forms/_forms.scss

@@ -1,4 +1,4 @@
-// sass-lint:disable no-vendor-prefixes, no-css-comments
+// stylelint-disable property-no-vendor-prefix
 
 // Form defaults
 //

assets/sass/base/links/_links.scss

@@ -14,7 +14,7 @@
 a,
 %link {
   color: $link;
-  // sass-lint:disable no-vendor-prefixes
+  // stylelint-disable property-no-vendor-prefix
   // Remove gaps in links underline in iOS 8+ and Safari 8+.
   -webkit-text-decoration-skip: objects;
 }

assets/sass/base/text/_text.scss

@@ -10,7 +10,7 @@
 abbr[title] {
   // Remove the bottom border in Chrome 57- and Firefox 39-.
   border-bottom: 0;
-  // sass-lint:disable no-duplicate-properties
+  // stylelint-disable no-duplicate-properties
   // Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
   text-decoration: underline;
   text-decoration: underline dotted;
@@ -31,7 +31,7 @@ strong {
   font-weight: inherit;
 }
 
-// sass-lint:disable no-mergeable-selectors
+// stylelint-disable no-mergeable-selectors
 b,
 strong {
   // Add the correct font weight in Chrome, Edge, and Safari.

assets/sass/components/button/_button.scss

@@ -14,7 +14,7 @@ button,
 [type='button'],
 [type='reset'],
 [type='submit'] {
-  // sass-lint:disable no-color-hex, no-color-literals
+  // stylelint-disable color-no-hex, color-named
   @extend %button--disabled;
   @include typeface(headings);
   @include margin-right(.75);
@@ -38,7 +38,7 @@ button,
   border-bottom-color: #b4b4b4;
   border-radius: 2px;
 
-  // sass-lint:disable no-vendor-prefixes
+  // stylelint-disable property-no-vendor-prefix
   // Correct the inability to style clickable types in iOS and Safari.
   -moz-appearance: button;
   -webkit-appearance: button;
@@ -53,7 +53,7 @@ button,
   &:-moz-focusring {
     outline: 1px dotted ButtonText;
   }
-  // sass-lint:enable no-vendor-prefixes
+  // sass-lint:enable property-no-vendor-prefix
 
   &:hover,
   &:focus,

assets/sass/components/cookieconsent/_cookieconsent.scss

@@ -3,11 +3,11 @@
 .cookieconsent {
   @include type-layout(s, 1);
   position: sticky;
-  bottom:  0;
+  bottom: 0;
   width: 100%;
   color: $warning;
   background-color: $warning-bg;
-  border-top:  4px solid $warning-border;
+  border-top: 4px solid $warning-border;
   text-align: center;
   transform: translateY(100vh);
   transition: all 130ms ease-in;

assets/sass/components/inline-sibling/_inline-sibling.scss

@@ -1,3 +1,5 @@
+// stylelint-disable selector-max-compound-selectors
+
 // Inline sibling
 //
 // An element that needs to appear inline with the content that follows.

assets/sass/components/watermark/_watermark.scss

@@ -14,7 +14,7 @@
   font-size: 75px;
   line-height: 1;
   text-align: center;
-  // sass-lint:disable no-color-literals
+  // stylelint-disable no-color-literals
   text-shadow: 0 0 1px rgba(0, 0, 0, .1);
   word-wrap: break-word;
 }

assets/sass/components/wireframe/_wireframe.scss

@@ -9,7 +9,6 @@ $with-wireframes: false !default;
 // variable: `$with-wireframes: true;`
 
 @if $with-wireframes {
-
   .wireframe,
   %wireframe {
     outline: 1px solid $border;
@@ -31,5 +30,4 @@ $with-wireframes: false !default;
       @extend %wireframe;
     }
   }
-
 }

assets/sass/init/_colors.scss

@@ -1,4 +1,4 @@
-// sass-lint:disable no-color-keywords; no-color-hex
+// stylelint-disable color-no-hex, color-named
 
 // Base colors.
 $black:                  #000;

assets/sass/init/_variables.scss

@@ -102,7 +102,7 @@ $typefaces: (
     // We could also specify the following property:
     // letter-spacing: .5px,
   ),
-);
+); // stylelint-disable indentation
 
 // Output a horizontal grid to help with debugging typography.
 $typey-debug: false;

assets/sass/init/image-url/_image-url.scss

@@ -1,3 +1,5 @@
+// stylelint-disable function-url-quotes
+
 // The relative path from the css directory to the sass directory.
 $image-url-path-to-source: '../sass' !default;
 // The relative path from the root sass directory to where your components usually lie.

assets/sass/init/visually-hidden/_visually-hidden.scss

@@ -1,4 +1,4 @@
-// sass-lint:disable no-important
+// stylelint-disable declaration-no-important
 
 // visually-hidden()
 //

assets/sass/layouts/_layouts.scss

@@ -1,4 +1,4 @@
-// sass-lint:disable indentation
+// stylelint-disable indentation
 
 .layout {
   &__page {
@@ -29,7 +29,6 @@
 }
 
 @supports (display: grid) {
-
   .layout {
     &__page {
       display: grid;