feat: add option to restrict same origin;

- 788 bytes (+17b)

Author: lukeed

src/index.mjs

@@ -48,6 +48,7 @@ function prefetcher(url) {
  * @param {Array} options.urls - Array of URLs to prefetch (override)
  * @param {Object} options.el - DOM element to prefetch in-viewport links of
  * @param {Boolean} options.priority - Attempt higher priority fetch (low or high)
+ * @param {Boolean} options.sameOrigin - Restrict prefetching to assets with same origin.
  * @param {Array} options.origins - Allowed origins to prefetch (empty allows all)
  * @param {Number} options.timeout - Timeout after which prefetching will occur
  * @param {function} options.timeoutFn - Custom timeout function
@@ -62,7 +63,7 @@ export default function (options) {
 
   observer.priority = options.priority;
 
-  const allowed = options.origins || [];
+  const allowed = options.sameOrigin ? [location.hostname] : options.origins || [];
 
   options.timeoutFn(() => {
     // If URLs are given, prefetch them.