Save sitemap as xml during build

helpers/api/sitemap/build.js

@@ -0,0 +1,25 @@
+// import fs from 'fs-extra'
+import { simpleSitemapAndIndex } from 'sitemap'
+
+
+import { 
+    sitemapLocation 
+} from '~/helpers/constants.js'
+
+export async function saveSitemap ( sitemapUrls ) {
+
+    await simpleSitemapAndIndex({
+        hostname: process.env.PUBLIC_URL,
+        destinationDir: sitemapLocation,
+        gzip: false,
+        // [{ url: '/page-1/', changefreq: 'daily'}, ...],
+        sourceData: sitemapUrls.map( url => {
+            return {
+                url,
+                // Google doesn't care about changefreq and priority - https://www.seroundtable.com/google-priority-change-frequency-xml-sitemap-20273.html
+                // changefreq: 'daily'
+            }
+        }),
+    })
+
+}