refactor ConfirmDangerModal into ES module

app/assets/javascripts/confirm_danger_modal.js

-/* eslint-disable func-names, space-before-function-paren, wrap-iife, one-var, no-var, camelcase, one-var-declaration-per-line, no-else-return, max-len */
-
 import $ from 'jquery';
 import { rstrip } from './lib/utils/common_utils';
 
-window.ConfirmDangerModal = (function() {
-  function ConfirmDangerModal(form, text) {
-    var project_path, submit;
-    this.form = form;
+export default function initConfirmDangerModal($form, text) {
   $('.js-confirm-text').text(text || '');
   $('.js-confirm-danger-input').val('');
   $('#modal-confirm-danger').modal('show');
-    project_path = $('.js-confirm-danger-match').text();
-    submit = $('.js-confirm-danger-submit');
-    submit.disable();
-    $('.js-confirm-danger-input').off('input');
-    $('.js-confirm-danger-input').on('input', function() {
-      if (rstrip($(this).val()) === project_path) {
-        return submit.enable();
+
+  const confirmTextMatch = $('.js-confirm-danger-match').text();
+  const $submit = $('.js-confirm-danger-submit');
+  $submit.disable();
+
+  $('.js-confirm-danger-input').off('input').on('input', function handleInput() {
+    const confirmText = rstrip($(this).val());
+    if (confirmText === confirmTextMatch) {
+      $submit.enable();
     } else {
-        return submit.disable();
+      $submit.disable();
     }
   });
-    $('.js-confirm-danger-submit').off('click');
-    $('.js-confirm-danger-submit').on('click', (function(_this) {
-      return function() {
-        return _this.form.submit();
-      };
-    })(this));
-  }
-
-  return ConfirmDangerModal;
-})();
+  $('.js-confirm-danger-submit').off('click').on('click', () => $form.submit());
+}

app/assets/javascripts/main.js

 /* eslint-disable import/first */
-/* global ConfirmDangerModal */
 /* global $ */
 
 import jQuery from 'jquery';
@@ -21,7 +20,7 @@ import './behaviors/';
 // everything else
 import loadAwardsHandler from './awards_handler';
 import bp from './breakpoints';
-import './confirm_danger_modal';
+import initConfirmDangerModal from './confirm_danger_modal';
 import Flash, { removeFlashClickListener } from './flash';
 import './gl_dropdown';
 import initTodoToggle from './header';
@@ -215,13 +214,11 @@ document.addEventListener('DOMContentLoaded', () => {
   });
 
   $document.on('click', '.js-confirm-danger', (e) => {
-    const btn = $(e.target);
-    const form = btn.closest('form');
-    const text = btn.data('confirmDangerMessage');
     e.preventDefault();
-
-    // eslint-disable-next-line no-new
-    new ConfirmDangerModal(form, text);
+    const $btn = $(e.target);
+    const $form = $btn.closest('form');
+    const text = $btn.data('confirmDangerMessage');
+    initConfirmDangerModal($form, text);
   });
 
   $document.on('breakpoint:change', (e, breakpoint) => {