.

node_modules/next/dist/esm/client/components/app-router-utils.js

@@ -0,0 +1,40 @@
+import { isBot } from '../../shared/lib/router/utils/is-bot';
+import { addBasePath } from '../add-base-path';
+export function isExternalURL(url) {
+    return url.origin !== window.location.origin;
+}
+/**
+ * Given a link href, constructs the URL that should be prefetched. Returns null
+ * in cases where prefetching should be disabled, like external URLs, or
+ * during development.
+ * @param href The href passed to <Link>, router.prefetch(), or similar
+ * @returns A URL object to prefetch, or null if prefetching should be disabled
+ */ export function createPrefetchURL(href) {
+    // Don't prefetch for bots as they don't navigate.
+    if (isBot(window.navigator.userAgent)) {
+        return null;
+    }
+    let url;
+    try {
+        url = new URL(addBasePath(href), window.location.href);
+    } catch (_) {
+        // TODO: Does this need to throw or can we just console.error instead? Does
+        // anyone rely on this throwing? (Seems unlikely.)
+        throw Object.defineProperty(new Error(`Cannot prefetch '${href}' because it cannot be converted to a URL.`), "__NEXT_ERROR_CODE", {
+            value: "E234",
+            enumerable: false,
+            configurable: true
+        });
+    }
+    // Don't prefetch during development (improves compilation performance)
+    if (process.env.NODE_ENV === 'development') {
+        return null;
+    }
+    // External urls can't be prefetched in the same way.
+    if (isExternalURL(url)) {
+        return null;
+    }
+    return url;
+}
+
+//# sourceMappingURL=app-router-utils.js.map