Fix query param handling by

* not using a for-of loop on an iterator that is transpiled wrongly
* not using URL.searchParams which is only supported by rather new
  browsers

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "sapper",
-  "version": "0.4.0",
+  "version": "0.5.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -5437,6 +5437,11 @@
       "resolved": "https://registry.npmjs.org/querystring-es3/-/querystring-es3-0.2.1.tgz",
       "integrity": "sha1-nsYfeQSYdXB9aUFFlv2Qek1xHnM="
     },
+    "querystringify": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/querystringify/-/querystringify-1.0.0.tgz",
+      "integrity": "sha1-YoYkIRLFtxL6ZU5SZlK/ahP/Bcs="
+    },
     "randomatic": {
       "version": "1.1.7",
       "resolved": "https://registry.npmjs.org/randomatic/-/randomatic-1.1.7.tgz",
@@ -5746,6 +5751,11 @@
         "resolve-from": "1.0.1"
       }
     },
+    "requires-port": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
+      "integrity": "sha1-kl0mAdOaxIXgkc8NpcbmlNw9yv8="
+    },
     "resolve": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.5.0.tgz",
@@ -6640,6 +6650,15 @@
         }
       }
     },
+    "url-parse": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.2.0.tgz",
+      "integrity": "sha512-DT1XbYAfmQP65M/mE6OALxmXzZ/z1+e5zk2TcSKe/KiYbNGZxgtttzC0mR/sjopbpOXcbniq7eIKmocJnUWlEw==",
+      "requires": {
+        "querystringify": "1.0.0",
+        "requires-port": "1.0.0"
+      }
+    },
     "util": {
       "version": "0.10.3",
       "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",

src/runtime/index.ts

@@ -28,8 +28,12 @@ function select_route(url: URL): Target {
 			const params = route.params(match);
 
 			const query: Record<string, string | true> = {};
-			for (const [key, value] of url.searchParams) query[key] = value || true;
-
+			if (url.search.length > 0) {
+			    url.search.slice(1).split('&').forEach(searchParam => {
+			        const [, key, value] = /([^=]+)=(.*)/.exec(searchParam);
+			        query[key] = value || true;
+			    })
+			}
 			return { url, route, data: { params, query } };
 		}
 	}