fix(core): update

ts/smartsitemap.classes.sitemapwebsite.ts

@@ -0,0 +1,42 @@
+import * as plugins from './smartsitemap.plugins';
+
+export type TUpdateFrequency = 'never' | 'daily' | 'weekly' | 'monthly' | 'yearly';
+
+export interface IUrlInfo {
+  url: string;
+  timestamp: number;
+  frequency?: TUpdateFrequency;
+}
+
+export class SitemapWebsite {
+  urlInfos: IUrlInfo[] = [];
+  constructor() {}
+
+  public addUrl(urlInfoArg: IUrlInfo) {
+    this.urlInfos.push(urlInfoArg);
+  }
+
+  public exportSitemapXml() {
+    const urls: {
+      loc: string;
+      lastmod: string;
+      changefreq: TUpdateFrequency;
+    }[] = [];
+    for (const urlInfoArg of this.urlInfos) {
+      urls.push({
+        loc: urlInfoArg.url,
+        lastmod: new Date(urlInfoArg.timestamp).toISOString(),
+        changefreq: urlInfoArg.frequency ? urlInfoArg.frequency : 'weekly'
+      });
+    }
+    const sitemapObject: any = {
+      urlset: {
+        '@_xmlns': 'http://www.sitemaps.org/schemas/sitemap/0.9',
+        url: urls,
+      },
+    };
+    const smartxmlInstance = new plugins.smartxml.SmartXml();
+    const sitemapString = smartxmlInstance.createXmlFromObject(sitemapObject);
+    return sitemapString;
+  }
+}