experiment: start implementing checks in wasm (client side only so far)

Signed-off-by: Xe Iaso <me@xeiaso.net>

web/js/xeact.mjs

@@ -0,0 +1,13 @@
+/**
+ * Generate a relative URL from `url`, appending all key-value pairs from `params` as URL-encoded parameters.
+ *
+ * @type{function(string=, Object=): string}
+ */
+export const u = (url = "", params = {}) => {
+  let result = new URL(url, window.location.href);
+  Object.entries(params).forEach((kv) => {
+    let [k, v] = kv;
+    result.searchParams.set(k, v);
+  });
+  return result.toString();
+};