diff --git a/src/_h5ai/public/js/lib/core/resource.js b/src/_h5ai/public/js/lib/core/resource.js
index 92053bdf..b7723628 100644
--- a/src/_h5ai/public/js/lib/core/resource.js
+++ b/src/_h5ai/public/js/lib/core/resource.js
@@ -18,11 +18,11 @@ modulejs.define('core/resource', ['_', 'config', 'core/settings'], function (_,
             return themesHref + href;
         }
 
-        if (_.indexOf(defaultIcons, id) >= 0) {
+        if (_.includes(defaultIcons, id)) {
             return defaultThemeHref + id + '.svg';
         }
 
-        if (_.indexOf(defaultIcons, baseId) >= 0) {
+        if (_.includes(defaultIcons, baseId)) {
             return defaultThemeHref + baseId + '.svg';
         }
 
diff --git a/src/_h5ai/public/js/lib/ext/preview-aud.js b/src/_h5ai/public/js/lib/ext/preview-aud.js
index eb489fee..06fee609 100644
--- a/src/_h5ai/public/js/lib/ext/preview-aud.js
+++ b/src/_h5ai/public/js/lib/ext/preview-aud.js
@@ -78,13 +78,13 @@ modulejs.define('ext/preview-audio', ['_', '$', 'core/event', 'core/format', 'co
     }
 
     function initItem(item) {
-        if (item.$view && _.indexOf(settings.types, item.type) >= 0) {
+        if (item.$view && _.includes(settings.types, item.type)) {
             item.$view.find('a').on('click', function (ev) {
                 ev.preventDefault();
 
                 var matchedItems = _.compact(_.map($('#items .item'), function (matchedItem) {
                     matchedItem = $(matchedItem).data('item');
-                    return _.indexOf(settings.types, matchedItem.type) >= 0 ? matchedItem : null;
+                    return _.includes(settings.types, matchedItem.type) ? matchedItem : null;
                 }));
 
                 onEnter(matchedItems, _.indexOf(matchedItems, item));
diff --git a/src/_h5ai/public/js/lib/ext/preview-img.js b/src/_h5ai/public/js/lib/ext/preview-img.js
index 35b052ba..b16ce5f8 100644
--- a/src/_h5ai/public/js/lib/ext/preview-img.js
+++ b/src/_h5ai/public/js/lib/ext/preview-img.js
@@ -107,13 +107,13 @@ modulejs.define('ext/preview-img', ['_', '$', 'core/event', 'core/server', 'core
     }
 
     function initItem(item) {
-        if (item.$view && _.indexOf(settings.types, item.type) >= 0) {
+        if (item.$view && _.includes(settings.types, item.type)) {
             item.$view.find('a').on('click', function (ev) {
                 ev.preventDefault();
 
                 var matchedItems = _.compact(_.map($('#items .item'), function (matchedItem) {
                     matchedItem = $(matchedItem).data('item');
-                    return _.indexOf(settings.types, matchedItem.type) >= 0 ? matchedItem : null;
+                    return _.includes(settings.types, matchedItem.type) ? matchedItem : null;
                 }));
 
                 onEnter(matchedItems, _.indexOf(matchedItems, item));
diff --git a/src/_h5ai/public/js/lib/ext/preview-txt.js b/src/_h5ai/public/js/lib/ext/preview-txt.js
index 1351024d..96dd0776 100644
--- a/src/_h5ai/public/js/lib/ext/preview-txt.js
+++ b/src/_h5ai/public/js/lib/ext/preview-txt.js
@@ -106,13 +106,13 @@ modulejs.define('ext/preview-txt', ['_', '$', 'marked', 'prism', 'core/event', '
     }
 
     function initItem(item) {
-        if (item.$view && _.indexOf(_.keys(settings.types), item.type) >= 0) {
+        if (item.$view && _.includes(_.keys(settings.types), item.type)) {
             item.$view.find('a').on('click', function (ev) {
                 ev.preventDefault();
 
                 var matchedItems = _.compact(_.map($('#items .item'), function (matchedItem) {
                     matchedItem = $(matchedItem).data('item');
-                    return _.indexOf(_.keys(settings.types), matchedItem.type) >= 0 ? matchedItem : null;
+                    return _.includes(_.keys(settings.types), matchedItem.type) ? matchedItem : null;
                 }));
 
                 onEnter(matchedItems, _.indexOf(matchedItems, item));
diff --git a/src/_h5ai/public/js/lib/ext/preview-vid.js b/src/_h5ai/public/js/lib/ext/preview-vid.js
index 50a57b44..5b8465a1 100644
--- a/src/_h5ai/public/js/lib/ext/preview-vid.js
+++ b/src/_h5ai/public/js/lib/ext/preview-vid.js
@@ -79,13 +79,13 @@ modulejs.define('ext/preview-vid', ['_', '$', 'core/event', 'core/settings', 'ex
     }
 
     function initItem(item) {
-        if (item.$view && _.indexOf(settings.types, item.type) >= 0) {
+        if (item.$view && _.includes(settings.types, item.type)) {
             item.$view.find('a').on('click', function (ev) {
                 ev.preventDefault();
 
                 var matchedItems = _.compact(_.map($('#items .item'), function (matchedItem) {
                     matchedItem = $(matchedItem).data('item');
-                    return _.indexOf(settings.types, matchedItem.type) >= 0 ? matchedItem : null;
+                    return _.includes(settings.types, matchedItem.type) ? matchedItem : null;
                 }));
 
                 onEnter(matchedItems, _.indexOf(matchedItems, item));