Revert "feat(showdown): Remove all"

This reverts commit 9772af5.

packages/devextreme/js/__internal/ui/html_editor/converters/m_markdown.ts

@@ -1,5 +1,6 @@
 import { getWindow } from '@js/core/utils/window';
 import Errors from '@js/ui/widget/ui.errors';
+import ShowDown from 'showdown';
 import TurnDown from 'turndown';
 
 import converterController from '../m_converterController';
@@ -14,7 +15,7 @@ class MarkdownConverter {
     // @ts-expect-error
     const turndown = window && window.TurndownService || TurnDown;
     // @ts-expect-error
-    const showdown = window && window.showdown;
+    const showdown = window && window.showdown || ShowDown;
 
     if (!turndown) {
       throw Errors.Error('E1041', 'Turndown');

packages/devextreme/package.json

@@ -37,6 +37,7 @@
     "inferno-hydrate": "^7.4.9",
     "jszip": "^3.10.1",
     "rrule": "^2.7.1",
+    "showdown": "^2.1.0",
     "turndown": "~7.1.0"
   },
   "devDependencies": {

packages/devextreme/testing/helpers/quillDependencies/noShowdown.js

@@ -0,0 +1 @@
+window.showdown = module.exports = null;

packages/devextreme/testing/runner/Views/Main/RunSuite.cshtml

@@ -235,6 +235,7 @@
                     'jspdf': '@Url.Content("~/packages/devextreme/node_modules/jspdf/dist/jspdf.umd.js")',
                     'jspdf-autotable': '@Url.Content("~/packages/devextreme/node_modules/jspdf-autotable/dist/jspdf.plugin.autotable.js")',
                     'turndown': '@Url.Content("~/packages/devextreme/node_modules/turndown/lib/turndown.browser.umd.js")',
+                    'showdown': '@Url.Content("~/packages/devextreme/node_modules/showdown/dist/showdown.js")',
                     'rrule': '@Url.Content("~/packages/devextreme/node_modules/rrule/dist/es5/rrule.js")',
 
                     // Inferno

packages/devextreme/testing/tests/DevExpress.ui.widgets.htmlEditor/htmlEditor.missingModules.tests.part1.js

@@ -1,2 +1,3 @@
 require('../../helpers/ignoreQuillTimers.js');
 require('./htmlEditorParts/importQuill.tests.js');
+require('./htmlEditorParts/importShowdown.tests.js');

packages/devextreme/testing/tests/DevExpress.ui.widgets.htmlEditor/htmlEditorParts/importShowdown.tests.js

@@ -0,0 +1,37 @@
+SystemJS.config({
+    map: {
+        'showdown': '/packages/devextreme/testing/helpers/quillDependencies/noShowdown.js'
+    }
+});
+
+define(function(require) {
+    const MarkdownConverter = require('ui/html_editor/converters/markdown');
+
+    QUnit.module('Import 3rd party', function() {
+        QUnit.test('it throw an error if the markdown -> html converter script isn\'t referenced', function(assert) {
+            assert.throws(
+                function() { new MarkdownConverter(); },
+                function(e) {
+                    return /(E1041)[\s\S]*(Showdown)/.test(e.message);
+                },
+                'The showdown script isn\'t referenced'
+            );
+        });
+
+        QUnit.test('initialize showdown from window', function(assert) {
+            const prevWinShowdown = window.showdown;
+
+            window.showdown = {
+                Converter: function() {
+                    this.initialized = true;
+                }
+            };
+
+            const converter = new MarkdownConverter();
+
+            assert.ok(converter._markdown2Html.initialized);
+
+            window.showdown = prevWinShowdown;
+        });
+    });
+});

packages/devextreme/webpack.config.js

@@ -26,6 +26,7 @@ module.exports = {
         'globalize/message': 'window.Globalize',
         'devextreme-quill': 'window.DevExpress.Quill',
         'turndown': 'window.TurndownService',
+        'showdown': 'window.showdown',
         'exceljs': 'window.ExcelJS',
         'jspdf': 'window.jspdf.jsPDF',
         'devexpress-diagram': 'window.DevExpress.diagram',