Argument Length Check, Duplicate Fix for Redact Funcation

src/base-apis.js

@@ -1,23 +1,3 @@
-/**
- * @param {string} roomId
- * @param {string} eventId
- * @param {string=} txnId     transaction id. One will be made up if not
- *    supplied.
- * @param {module:client.callback} callback Optional.
- * @return {module:client.Promise} Resolves: TODO
- * @return {module:http-api.MatrixError} Rejects: with an error response.
- */
-MatrixBaseApis.prototype.redactEvent = function(
-    roomId, eventId, txnId, callback,
-) {
-    const path = utils.encodeUri("/rooms/$roomId/redact/$eventId/$tnxId", {
-        $roomId: roomId,
-        $eventId: eventId,
-        $txnId: txnId ? txnId : this.makeTxnId(),
-    });
-
-    return this._http.authedRequest(callback, "PUT", path, undefined, {});
-};
 /*
 Copyright 2015, 2016 OpenMarket Ltd
 Copyright 2017 Vector Creations Ltd
@@ -920,6 +900,10 @@ MatrixBaseApis.prototype.sendStateEvent = function(roomId, eventType, content, s
 MatrixBaseApis.prototype.redactEvent = function(
     roomId, eventId, txnId, callback,
 ) {
+    if (arguments.length === 3) {
+        callback = txnId;
+    }
+
     const path = utils.encodeUri("/rooms/$roomId/redact/$eventId/$tnxId", {
         $roomId: roomId,
         $eventId: eventId,