Add deprecation warning for Repository#mergeBranches parameter

ianhattendorf · ianhattendorf · commit 4259208f653a · 2019-04-17T15:51:59.000-07:00
diff --git a/lib/repository.js b/lib/repository.js
@@ -1703,6 +1703,10 @@ Repository.prototype.mergeBranches = function(
   let toBranch;
   // Support old parameter `processMergeMessageCallback`
   const isOldOptionParameter = typeof mergeBranchOptions === "function";
+  if (isOldOptionParameter) {
+    console.error("DeprecationWarning: Repository#mergeBranches parameter " +
+                  "processMergeMessageCallback, use MergeBranchOptions");
+  }
   const processMergeMessageCallback = mergeBranchOptions &&
     (isOldOptionParameter ?
       mergeBranchOptions :
