fix(core): update

ts/smartsitemap.classes.sitemapnews.ts

@@ -1,20 +1,33 @@
 import * as plugins from './smartsitemap.plugins';
+import * as interfaces from './interfaces';
 
 export class SitemapNews {
-  public items: any[] = [];
+  public rssItems: interfaces.IRssItem[] = [];
 
   constructor(optionsArg: {}) {}
 
   public async readAndAddFromRssFeedString(feedStringArg: string) {
     const smartfeedInstance = new plugins.smartfeed.Smartfeed();
     const parsedFeed = await smartfeedInstance.parseFeedFromString(feedStringArg);
-    this.items = this.items.concat(parsedFeed.items);
+    this.rssItems = this.rssItems.concat(parsedFeed.items);
   }
 
   public async readAndAddFromRssFeedUrl(urlArg: string) {
     const smartfeedInstance = new plugins.smartfeed.Smartfeed();
     const parsedFeed = await smartfeedInstance.parseFeedFromUrl(urlArg);
-    this.items = this.items.concat(parsedFeed.items);
+    this.rssItems = this.rssItems.concat(parsedFeed.items);
+  }
+
+  public async readAndParseArticles(articleArrayArg: plugins.tsclass.content.IArticle[]) {
+    const rssItemArray = articleArrayArg.map((articleArg): interfaces.IRssItem => {
+      return {
+        title: articleArg.title,
+        content: articleArg.content,
+        isoDate: new Date(/* TODO: put article timestamp here */).toISOString()
+      };
+    });
+
+    this.rssItems = this.rssItems.concat(rssItemArray);
   }
 
   public exportSitemapXml() {
@@ -25,24 +38,24 @@ export class SitemapNews {
           'news:name': string;
           'news:language': string;
         };
-        "news:publication_date" : string;
-        "news:keywords": string;
-        "news:title": string;
+        'news:publication_date': string;
+        'news:keywords': string;
+        'news:title': string;
       };
     }[] = [];
-    for (const itemArg of this.items) {
+    for (const itemArg of this.rssItems) {
       urls.push({
         loc: itemArg.link,
-        "news:news": {
-          "news:publication": {
-            "news:language": 'en',
-            "news:name": 'some name'
+        'news:news': {
+          'news:publication': {
+            'news:language': 'en',
+            'news:name': 'some name',
           },
-          "news:keywords": '',
-          "news:publication_date": itemArg.isoDate,
-          "news:title": itemArg.title
-        }
-      })
+          'news:keywords': '',
+          'news:publication_date': itemArg.isoDate,
+          'news:title': itemArg.title,
+        },
+      });
     }
     const sitemapObject: any = {
       urlset: {