clean(index.mjs, prefetch.mjs) move prefetching logic to one place

src/index.mjs

@@ -1,17 +1,6 @@
-import prefetch from './prefetch.mjs';
+import prefetchLinks from './prefetch.mjs';
 import requestIdleCallback from './request-idle-callback.mjs';
 
-/**
- * Prefetch an array of URLs using rel=prefetch
- * if supported. Falls back to XHR otherwise.
- * @param {Array} urls Array of URLs to prefetch
- */
-function fetchLinks(urls) {
-  urls.forEach(url => {
-    prefetch(url);
-  });
-}
-
 /**
  * Extract links from a provided DOM element that are
  * in the user's viewport.
@@ -64,12 +53,12 @@ export default function (options) {
     }
     // Prefetch an array of URLs if supplied (as an override)
     if (options.urls !== undefined && options.urls.length > 0) {
-      fetchLinks(options.urls);
+      prefetchLinks(options.urls);
     } else {
       // Element to extract in-viewport links for
       const el = options.el || document;
       extractInViewportLinks(el).then(urls => {
-        fetchLinks(urls);
+        prefetchLinks(urls);
       });
     }
   });

src/prefetch.mjs

@@ -44,4 +44,15 @@ const prefetch = function (url) {
   supportedPrefetchStrategy(url);
 };
 
-export default prefetch;
+/**
+ * Prefetch an array of URLs using rel=prefetch
+ * if supported. Falls back to XHR otherwise.
+ * @param {Array} urls Array of URLs to prefetch
+ */
+const prefetchLinks = function (urls) {
+  urls.forEach(url => {
+    prefetch(url);
+  });
+}
+
+export default prefetchLinks;