feat(base/connection): throw error and add isInviteURLReady

react/features/base/connection/functions.js

 import { toState } from '../redux';
 
 /**
- * Retrieves a simplified version of the conference/location URL stripped of URL
- * params (i.e. Query/search and hash) which should be used for sending invites.
+ * Retrieves a simplified version of the conference/location URL stripped of URL params (i.e. Query/search and hash)
+ * which should be used for sending invites.
+ * NOTE that the method will throw an error if called too early. That is before the conference is joined or before
+ * the process of joining one has started. This limitation does not apply to the case when called with the URL object
+ * instance. Use {@link isInviteURLReady} to check if it's safe to call the method already.
  *
- * @param {Function|Object} stateOrGetState - The redux state or redux's
- * {@code getState} function.
+ * @param {Function|Object} stateOrGetState - The redux state or redux's {@code getState} function or the URL object
+ * to be stripped.
  * @returns {string}
  */
 export function getInviteURL(stateOrGetState: Function | Object): string {
     const state = toState(stateOrGetState);
-    const locationURL
+    let locationURL
         = state instanceof URL
             ? state
             : state['features/base/connection'].locationURL;
 
+    // If there's no locationURL on the base/connection feature try the base/config where it's set earlier.
+    if (!locationURL) {
+        locationURL = state['features/base/config'].locationURL;
+    }
+
+    if (!locationURL) {
+        throw new Error('Can not get invite URL - the app is not ready');
+    }
+
     return getURLWithoutParams(locationURL).href;
 }
 
+/**
+ * Checks whether or not is safe to call the {@link getInviteURL} method already.
+ *
+ * @param {Function|Object} stateOrGetState - The redux state or redux's {@code getState} function.
+ * @returns {boolean}
+ */
+export function isInviteURLReady(stateOrGetState: Function | Object): boolean {
+    const state = toState(stateOrGetState);
+
+    return Boolean(state['features/base/connection'].locationURL || state['features/base/config'].locationURL);
+}
+
 /**
  * Gets a {@link URL} without hash and query/search params from a specific
  * {@code URL}.