diff --git a/src/_h5ai/public/js/lib/core/format.js b/src/_h5ai/public/js/lib/core/format.js
index 1bb52f69..85901f3a 100644
--- a/src/_h5ai/public/js/lib/core/format.js
+++ b/src/_h5ai/public/js/lib/core/format.js
@@ -1,4 +1,4 @@
-const {lo} = require('../globals');
+const isNum = x => typeof x === 'number';
 
 const decimalMetric = {
     t: 1000.0,
@@ -30,14 +30,14 @@ const datePatterns = [
 let defaultDateFormat = 'YYYY-MM-DD HH:mm';
 
 
-function setDefaultMetric(useBinaryMetric) {
+const setDefaultMetric = useBinaryMetric => {
     defaultMetric = useBinaryMetric ? binaryMetric : decimalMetric;
-}
+};
 
-function formatSize(size, metric) {
+const formatSize = (size, metric) => {
     metric = metric || defaultMetric;
 
-    if (!lo.isNumber(size) || size < 0) {
+    if (!isNum(size) || size < 0) {
         return '';
     }
 
@@ -49,22 +49,22 @@ function formatSize(size, metric) {
         i += 1;
     }
     return (i <= 1 ? Math.round(size) : size.toFixed(1)).toString() + ' ' + metric.u[i];
-}
+};
 
-function setDefaultDateFormat(dateFormat) {
+const setDefaultDateFormat = dateFormat => {
     defaultDateFormat = dateFormat;
-}
+};
 
-function formatNumber(number, padding) {
+const formatNumber = (number, padding) => {
     let str = String(number);
     if (padding) {
         str = ('000' + str).substr(-padding);
     }
     return str;
-}
+};
 
-function formatDate(millis, format) {
-    if (!millis || !lo.isNumber(millis)) {
+const formatDate = (millis, format) => {
+    if (!millis || !isNum(millis)) {
         return '';
     }
 
@@ -85,7 +85,7 @@ function formatDate(millis, format) {
     });
 
     return format;
-}
+};
 
 
 module.exports = {
diff --git a/src/_h5ai/public/js/lib/core/location.js b/src/_h5ai/public/js/lib/core/location.js
index 79bb5d8a..8e073194 100644
--- a/src/_h5ai/public/js/lib/core/location.js
+++ b/src/_h5ai/public/js/lib/core/location.js
@@ -6,7 +6,7 @@ const event = require('./event');
 const notification = require('../view/notification');
 
 const doc = win.document;
-const settings = lo.extend({
+const settings = Object.assign({
     fastBrowsing: true,
     unmanagedInNewWindow: true
 }, allsettings.view);
diff --git a/src/_h5ai/public/js/lib/core/resource.js b/src/_h5ai/public/js/lib/core/resource.js
index 6b9fda7f..85de53f3 100644
--- a/src/_h5ai/public/js/lib/core/resource.js
+++ b/src/_h5ai/public/js/lib/core/resource.js
@@ -1,7 +1,8 @@
-const {lo} = require('../globals');
 const config = require('../config');
 const settings = require('./settings');
 
+const includes = (arr, x) => arr.indexOf(x) >= 0;
+
 const imagesHref = settings.publicHref + 'images/';
 const uiHref = imagesHref + 'ui/';
 const themesHref = imagesHref + 'themes/';
@@ -21,11 +22,11 @@ function icon(id) {
         return themesHref + href;
     }
 
-    if (lo.includes(defaultIcons, id)) {
+    if (includes(defaultIcons, id)) {
         return defaultThemeHref + id + '.svg';
     }
 
-    if (lo.includes(defaultIcons, baseId)) {
+    if (includes(defaultIcons, baseId)) {
         return defaultThemeHref + baseId + '.svg';
     }
 
diff --git a/src/_h5ai/public/js/lib/core/store.js b/src/_h5ai/public/js/lib/core/store.js
index eae92a12..59e414af 100644
--- a/src/_h5ai/public/js/lib/core/store.js
+++ b/src/_h5ai/public/js/lib/core/store.js
@@ -4,26 +4,26 @@ const store = win.localStorage;
 const storekey = '_h5ai';
 
 
-function load() {
+const load = () => {
     try {
         return JSON.parse(store[storekey]);
     } catch (e) {/* skip */}
     return {};
-}
+};
 
-function save(obj) {
+const save = obj => {
     store[storekey] = JSON.stringify(obj);
-}
+};
 
-function put(key, value) {
+const put = (key, value) => {
     const obj = load();
     obj[key] = value;
     save(obj);
-}
+};
 
-function get(key) {
+const get = key => {
     return load()[key];
-}
+};
 
 
 module.exports = {
diff --git a/src/_h5ai/public/js/lib/core/types.js b/src/_h5ai/public/js/lib/core/types.js
index ca1a9fe1..256324ee 100644
--- a/src/_h5ai/public/js/lib/core/types.js
+++ b/src/_h5ai/public/js/lib/core/types.js
@@ -1,23 +1,25 @@
-const {lo} = require('../globals');
 const config = require('../config');
 
+const each = (obj, fn) => Object.keys(obj).forEach(key => fn(obj[key], key));
+const map = (arr, fn) => Array.from(arr, fn);
+
 const reEndsWithSlash = /\/$/;
 const regexps = {};
 
 
-function escapeRegExp(sequence) {
+const escapeRegExp = sequence => {
     return sequence.replace(/[\-\[\]\/\{\}\(\)\+\?\.\\\^\$]/g, '\\$&');
     // return sequence.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, '\\$&');
-}
+};
 
-function parse(types) {
-    lo.each(types, (patterns, type) => {
-        const pattern = '^(' + lo.map(patterns, p => '(' + escapeRegExp(p).replace(/\*/g, '.*') + ')').join('|') + ')$';
+const parse = types => {
+    each(types, (patterns, type) => {
+        const pattern = '^(' + map(patterns, p => '(' + escapeRegExp(p).replace(/\*/g, '.*') + ')').join('|') + ')$';
         regexps[type] = new RegExp(pattern, 'i');
     });
-}
+};
 
-function getType(sequence) {
+const getType = sequence => {
     if (reEndsWithSlash.test(sequence)) {
         return 'folder';
     }
@@ -26,15 +28,14 @@ function getType(sequence) {
     const name = slashidx >= 0 ? sequence.substr(slashidx + 1) : sequence;
     let result;
 
-    lo.each(regexps, (regexp, type) => { // eslint-disable-line consistent-return
+    each(regexps, (regexp, type) => {
         if (regexps[type].test(name)) {
             result = type;
-            return false;
         }
     });
 
     return result ? result : 'file';
-}
+};
 
 
 parse(Object.assign({}, config.types));
diff --git a/src/_h5ai/public/js/lib/core/util.js b/src/_h5ai/public/js/lib/core/util.js
index 4161a564..56ef64c2 100644
--- a/src/_h5ai/public/js/lib/core/util.js
+++ b/src/_h5ai/public/js/lib/core/util.js
@@ -1,6 +1,4 @@
-const {lo} = require('../globals');
-
-function regularCmpFn(val1, val2) {
+const regularCmpFn = (val1, val2) => {
     if (val1 < val2) {
         return -1;
     }
@@ -8,13 +6,13 @@ function regularCmpFn(val1, val2) {
         return 1;
     }
     return 0;
-}
+};
 
 // Natural Sort algorithm for Javascript - Version 0.7 - Released under MIT license
 // Author: Jim Palmer (based on chunking idea from Dave Koelle)
 //
 // Modified to make it work with h5ai
-function naturalCmpFn(val1, val2) {
+const naturalCmpFn = (val1, val2) => {
     const re = /(^-?[0-9]+(\.?[0-9]*)[df]?e?[0-9]?$|^0x[0-9a-f]+$|[0-9]+)/gi;
     const sre = /(^[ ]*|[ ]*$)/g;
     const dre = /(^([\w ]+,?[\w ]+)?[\w ]+,?[\w ]+\d+:\d+(:\d+)?[\w ]?|^\d{1,4}[\/\-]\d{1,4}[\/\-]\d{1,4}|^\w+, \w+ \d+, \d{4})/;
@@ -60,13 +58,13 @@ function naturalCmpFn(val1, val2) {
         }
     }
     return 0;
-}
+};
 
-function escapePattern(sequence) {
+const escapePattern = sequence => {
     return sequence.replace(/[\-\[\]{}()*+?.,\\$\^|#\s]/g, '\\$&');
-}
+};
 
-function parsePattern(sequence, advanced) {
+const parsePattern = (sequence, advanced) => {
     if (!advanced) {
         return escapePattern(sequence);
     }
@@ -75,14 +73,10 @@ function parsePattern(sequence, advanced) {
         return sequence.substr(3);
     }
 
-    sequence = lo.map(lo.trim(sequence).split(/\s+/), part => {
-        return lo.map(part.split(''), character => {
-            return escapePattern(character);
-        }).join('.*?');
+    return sequence.trim().split(/\s+/).map(part => {
+        return part.split('').map(char => escapePattern(char)).join('.*?');
     }).join('|');
-
-    return sequence;
-}
+};
 
 
 module.exports = {