ref(base/util): move getSymbolDescription to util

react/features/base/util/helpers.js

     return window.JitsiMeetJS.app;
 }
 
+/**
+ * Gets the description of a specific {@code Symbol}.
+ *
+ * @param {Symbol} symbol - The {@code Symbol} to retrieve the description of.
+ * @private
+ * @returns {string} The description of {@code symbol}.
+ */
+export function getSymbolDescription(symbol: ?Symbol) {
+    let description = symbol ? symbol.toString() : 'undefined';
+
+    if (description.startsWith('Symbol(') && description.endsWith(')')) {
+        description = description.slice(7, -1);
+    }
+
+    // The polyfill es6-symbol that we use does not appear to comply with the
+    // Symbol standard and, merely, adds @@ at the beginning of the description.
+    if (description.startsWith('@@')) {
+        description = description.slice(2);
+    }
+
+    return description;
+}
+
 /**
  * A helper function that behaves similar to Object.assign, but only reassigns a
  * property in target if it's defined in source.

react/features/mobile/external-api/middleware.js

 import { LOAD_CONFIG_ERROR } from '../../base/config';
 import { CONNECTION_FAILED } from '../../base/connection';
 import { MiddlewareRegistry } from '../../base/redux';
-import { toURLString } from '../../base/util';
+import { getSymbolDescription, toURLString } from '../../base/util';
 import { ENTER_PICTURE_IN_PICTURE } from '../picture-in-picture';
 
 /**
         break;
 
     case ENTER_PICTURE_IN_PICTURE:
-        _sendEvent(store, _getSymbolDescription(type), /* data */ {});
+        _sendEvent(store, getSymbolDescription(type), /* data */ {});
         break;
 
     case LOAD_CONFIG_ERROR: {
 
         _sendEvent(
             store,
-            _getSymbolDescription(type),
+            getSymbolDescription(type),
             /* data */ {
                 error: _toErrorString(error),
                 url: toURLString(locationURL)
             : '');
 }
 
-/**
- * Gets the description of a specific {@code Symbol}.
- *
- * @param {Symbol} symbol - The {@code Symbol} to retrieve the description of.
- * @private
- * @returns {string} The description of {@code symbol}.
- */
-function _getSymbolDescription(symbol: Symbol) {
-    let description = symbol.toString();
-
-    if (description.startsWith('Symbol(') && description.endsWith(')')) {
-        description = description.slice(7, -1);
-    }
-
-    // The polyfill es6-symbol that we use does not appear to comply with the
-    // Symbol standard and, merely, adds @@ at the beginning of the description.
-    if (description.startsWith('@@')) {
-        description = description.slice(2);
-    }
-
-    return description;
-}
-
 /**
  * If {@link SET_ROOM} action happens for a valid conference room this method
  * will emit an early {@link CONFERENCE_WILL_JOIN} event to let the external API
 
     isRoomValid(room) && locationURL && _sendEvent(
         store,
-        _getSymbolDescription(CONFERENCE_WILL_JOIN),
+        getSymbolDescription(CONFERENCE_WILL_JOIN),
         /* data */ {
             url: toURLString(locationURL)
         });
     }
 
     _swallowEvent(store, action, data)
-        || _sendEvent(store, _getSymbolDescription(type), data);
+        || _sendEvent(store, getSymbolDescription(type), data);
 }
 
 /**
             conference => conference.getConnection() !== connection)
         && _sendEvent(
         store,
-        _getSymbolDescription(CONFERENCE_FAILED),
+        getSymbolDescription(CONFERENCE_FAILED),
         /* data */ {
             url: toURLString(locationURL),
             error: action.error.name