Add an interface for MatrixClientCreds

and make MatrixClientPeg functions use it consistently

src/MatrixClientPeg.js

@@ -31,6 +31,14 @@ function deviceId() {
     return id;
 }
 
+interface MatrixClientCreds {
+    homeserverUrl: string,
+    identityServerUrl: string,
+    userId: string,
+    accessToken: string,
+    guest: boolean,
+}
+
 /**
  * Wrapper object for handling the js-sdk Matrix Client object in the react-sdk
  * Handles the creation/initialisation of client objects.
@@ -70,8 +78,14 @@ class MatrixClientPeg {
      * Replace this MatrixClientPeg's client with a client instance that has
      * Home Server / Identity Server URLs and active credentials
      */
-    replaceUsingAccessToken(hs_url, is_url, user_id, access_token, isGuest) {
-        this._replaceClient(hs_url, is_url, user_id, access_token, isGuest);
+    replaceUsingCreds(creds: MatrixClientCreds) {
+        this._replaceClient(
+            creds.homeserverUrl,
+            creds.identityServerUrl,
+            creds.userId,
+            creds.accessToken,
+            creds.guest,
+        );
     }
 
     _replaceClient(hs_url, is_url, user_id, access_token, isGuest) {
@@ -103,7 +117,7 @@ class MatrixClientPeg {
         }
     }
 
-    getCredentials() {
+    getCredentials(): MatrixClientCreds {
         return {
             homeserverUrl: this.matrixClient.baseUrl,
             identityServerUrl: this.matrixClient.idBaseUrl,