Fix tree-shakability

Author: hbirler

src/runtime/internal/utils.ts

@@ -40,13 +40,13 @@ export function safe_not_equal(a, b) {
 	return a != a ? b == b : a !== b || ((a && typeof a === 'object') || typeof a === 'function');
 }
 
-const relative_to_absolute = (function() {
-    const anchor = document.createElement('a');
-    return function(url) {
-        anchor.href = url;
-        return anchor.href;
-    };
-})();
+const relative_to_absolute : ((url: string) => string) & {anchor?: HTMLAnchorElement} = (url: string) => {
+	if (relative_to_absolute.anchor === undefined) {
+		relative_to_absolute.anchor = document.createElement('a');
+	}
+	relative_to_absolute.anchor.href = url;
+    return relative_to_absolute.anchor.href;
+}
 
 export function src_url_equal(element_src, url) {
 	return element_src === relative_to_absolute(url);