Fix URI resolution for inline $refs in schemas

Fixes #81

src/uri.js

@@ -1,11 +1,17 @@
-/*
+/**
  * This is just a hack to adapt the jsonschema lib to work without a polyfill for the "url" lib.
  */
 
-// https://nodejs.org/api/url.html#urlresolvefrom-to
+/**
+ * @see {@link https://nodejs.org/api/url.html#urlresolvefrom-to}
+ * @param {string} from
+ * @param {string} to
+ * @returns {string}
+ */
 export const resolve = (from, to) => {
   if (!to) return from;
-  const resolved = new URL(to, new URL(from, "resolve://"));
+  if (to.startsWith("#")) return (from || "") + to;
+  const resolved = new URL(to, new URL(from, "resolve://resolve/"));
 
   if (resolved.protocol === "resolve:") {
     const { pathname, search, hash } = resolved;
@@ -15,4 +21,8 @@ export const resolve = (from, to) => {
   return resolved.toString();
 };
 
+/**
+ * @param {string} uri
+ * @returns {URL}
+ */
 export const parse = (uri) => new URL(uri);