feat(rn,auth) add support for toekn URL auth

react/features/base/util/uri.ts

@@ -631,3 +631,29 @@ export function appendURLParam(url: string, name: string, value: string) {
 
     return newUrl.toString();
 }
+
+/**
+ * Adds new hash param to a url string.
+ * Checks whether to use '?' or '&' as a separator (checks for already existing params).
+ *
+ * @param {string} url - The url to modify.
+ * @param {string} name - The param name to add.
+ * @param {string} value - The value for the param.
+ *
+ * @returns {string} - The modified url.
+ */
+export function appendURLHashParam(url: string, name: string, value: string) {
+    const newUrl = new URL(url);
+    const dummyUrl = new URL('https://example.com');
+
+    // Copy current hash-parameters without the '#' as search-parameters.
+    dummyUrl.search = newUrl.hash.substring(1);
+
+    // Set or update value with the searchParams-API.
+    dummyUrl.searchParams.append(name, value);
+
+    // Write back as hash parameters.
+    newUrl.hash = dummyUrl.searchParams.toString();
+
+    return newUrl.toString();
+}