fix(module): prevent false positive warning about ignored root keys (#338)

Author: madebyfabian

src/module.ts

@@ -113,15 +113,18 @@ export default defineNuxtModule<ModuleOptions>({
       const isSitemapIndexOnly = typeof normalizedSitemaps?.index !== 'undefined' && Object.keys(normalizedSitemaps).length === 1
       if (!isSitemapIndexOnly) {
         // if the user is doing multi-sitempas using the sitemaps config, we warn when root keys are used as they won't do anything
-        const invalidRootKeys = [
-          'includeAppSources',
-          'sources',
-        ]
-        for (const key of invalidRootKeys) {
-          if (Object.keys(config).includes(key)) {
-            logger.warn(`You are using multiple-sitemaps but have provided \`sitemap.${key}\` in your Nuxt config. This will be ignored, please move it to the child sitemap config.`)
-            logger.warn('Learn more at: https://nuxtseo.com/sitemap/guides/multi-sitemaps')
-          }
+        const warnForIgnoredKey = (key: string) => {
+          logger.warn(`You are using multiple-sitemaps but have provided \`sitemap.${key}\` in your Nuxt config. This will be ignored, please move it to the child sitemap config.`)
+          logger.warn('Learn more at: https://nuxtseo.com/sitemap/guides/multi-sitemaps')
+        }
+
+        switch (true) {
+          case config?.sources?.length !== 0:
+            warnForIgnoredKey('sources')
+            break
+          case config?.includeAppSources !== undefined:
+            warnForIgnoredKey('includeAppSources')
+            break
         }
       }
     }