6 files changed, 6 insertions, 98 deletions
diff --git a/app/assets/javascripts/extensions/array.js b/app/assets/javascripts/extensions/array.js
index f8256a8d26d..027222f804d 100644
--- a/app/assets/javascripts/extensions/array.js
+++ b/app/assets/javascripts/extensions/array.js
@@ -1,27 +1,11 @@
-/* eslint-disable no-extend-native, func-names, space-before-function-paren, space-infix-ops, strict, max-len */
+// TODO: remove this
 
-'use strict';
-
-Array.prototype.first = function() {
+// eslint-disable-next-line no-extend-native
+Array.prototype.first = function first() {
   return this[0];
 };
 
-Array.prototype.last = function() {
-  return this[this.length-1];
-};
-
-Array.prototype.find = Array.prototype.find || function(predicate, ...args) {
-  if (!this) throw new TypeError('Array.prototype.find called on null or undefined');
-  if (typeof predicate !== 'function') throw new TypeError('predicate must be a function');
-
-  const list = Object(this);
-  const thisArg = args[1];
-  let value = {};
-
-  for (let i = 0; i < list.length; i += 1) {
-    value = list[i];
-    if (predicate.call(thisArg, value, i, list)) return value;
-  }
-
-  return undefined;
+// eslint-disable-next-line no-extend-native
+Array.prototype.last = function last() {
+  return this[this.length - 1];
 };
diff --git a/app/assets/javascripts/extensions/custom_event.js b/app/assets/javascripts/extensions/custom_event.js
deleted file mode 100644
index abedae4c1c7..00000000000
--- a/app/assets/javascripts/extensions/custom_event.js
+++ /dev/null
@@ -1,12 +0,0 @@
-/* global CustomEvent */
-/* eslint-disable no-global-assign */
-
-// Custom event support for IE
-CustomEvent = function CustomEvent(event, parameters) {
-  const params = parameters || { bubbles: false, cancelable: false, detail: undefined };
-  const evt = document.createEvent('CustomEvent');
-  evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
-  return evt;
-};
-
-CustomEvent.prototype = window.Event.prototype;
diff --git a/app/assets/javascripts/extensions/element.js b/app/assets/javascripts/extensions/element.js
deleted file mode 100644
index 90ab79305a7..00000000000
--- a/app/assets/javascripts/extensions/element.js
+++ /dev/null
@@ -1,20 +0,0 @@
-/* global Element */
-/* eslint-disable consistent-return, max-len, no-empty, func-names */
-
-Element.prototype.closest = Element.prototype.closest || function closest(selector, selectedElement = this) {
-  if (!selectedElement) return;
-  return selectedElement.matches(selector) ? selectedElement : Element.prototype.closest(selector, selectedElement.parentElement);
-};
-
-Element.prototype.matches = Element.prototype.matches ||
-  Element.prototype.matchesSelector ||
-  Element.prototype.mozMatchesSelector ||
-  Element.prototype.msMatchesSelector ||
-  Element.prototype.oMatchesSelector ||
-  Element.prototype.webkitMatchesSelector ||
-  function (s) {
-    const matches = (this.document || this.ownerDocument).querySelectorAll(s);
-    let i = matches.length - 1;
-    while (i >= 0 && matches.item(i) !== this) { i -= 1; }
-    return i > -1;
-  };
diff --git a/app/assets/javascripts/extensions/jquery.js b/app/assets/javascripts/extensions/jquery.js
deleted file mode 100644
index 1a489b859e8..00000000000
--- a/app/assets/javascripts/extensions/jquery.js
+++ /dev/null
@@ -1,16 +0,0 @@
-/* eslint-disable func-names, space-before-function-paren, object-shorthand, comma-dangle, max-len */
-// Disable an element and add the 'disabled' Bootstrap class
-(function() {
-  $.fn.extend({
-    disable: function() {
-      return $(this).attr('disabled', 'disabled').addClass('disabled');
-    }
-  });
-
-  // Enable an element and remove the 'disabled' Bootstrap class
-  $.fn.extend({
-    enable: function() {
-      return $(this).removeAttr('disabled').removeClass('disabled');
-    }
-  });
-}).call(window);
diff --git a/app/assets/javascripts/extensions/object.js b/app/assets/javascripts/extensions/object.js
deleted file mode 100644
index 70a2d765abd..00000000000
--- a/app/assets/javascripts/extensions/object.js
+++ /dev/null
@@ -1,26 +0,0 @@
-/* eslint-disable no-restricted-syntax */
-
-// Adapted from https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#Polyfill
-if (typeof Object.assign !== 'function') {
-  Object.assign = function assign(target, ...args) {
-    if (target == null) { // TypeError if undefined or null
-      throw new TypeError('Cannot convert undefined or null to object');
-    }
-
-    const to = Object(target);
-
-    for (let index = 0; index < args.length; index += 1) {
-      const nextSource = args[index];
-
-      if (nextSource != null) { // Skip over if undefined or null
-        for (const nextKey in nextSource) {
-          // Avoid bugs when hasOwnProperty is shadowed
-          if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
-            to[nextKey] = nextSource[nextKey];
-          }
-        }
-      }
-    }
-    return to;
-  };
-}
diff --git a/app/assets/javascripts/extensions/string.js b/app/assets/javascripts/extensions/string.js
deleted file mode 100644
index ae9662444b0..00000000000
--- a/app/assets/javascripts/extensions/string.js
+++ /dev/null
@@ -1,2 +0,0 @@
-import 'string.prototype.codepointat';
-import 'string.fromcodepoint';