diff --git a/.release-it.json b/.release-it.json
index d7341a3..a9849f9 100644
--- a/.release-it.json
+++ b/.release-it.json
@@ -12,6 +12,7 @@
     ]
   },
   "github": {
-    "release": true
+    "release": true,
+    "proxy": "http://127.0.0.1:9090"
   }
 }
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..cf33f42
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,3 @@
+interface NxStatic {
+  promiseSeries: (tasks: Promise<any>[], initial: any) => Promise<any>;
+}
diff --git a/package.json b/package.json
index ec7aa22..6af563d 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "gulp-uglify": "^3.0.2",
     "jest": "^26.6.3",
     "prettier": "^2.2.1",
-    "release-it": "^14.2.2",
+    "release-it": "^15.5.0",
     "uglify-js": "3.12.4",
     "uglify-save-license": "^0.4.1"
   },
@@ -45,4 +45,4 @@
     "promise",
     "series"
   ]
-}
\ No newline at end of file
+}
diff --git a/src/index.js b/src/index.js
index 3c12167..9155264 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,12 +4,12 @@
   var MSG_ERR = 'promise.series only accepts an array of functions';
   var NUM = 'number';
 
-  nx.promiseSeries = function(inTasks, inInitial) {
+  nx.promiseSeries = function (inTasks, inInitial) {
     if (!typeof inTasks.length === NUM) {
       return Promise.reject(new TypeError(MSG_ERR));
     }
-    return inTasks.reduce(function(current, next) {
-      return current.then(next);
+    return inTasks.reduce(function (res, next) {
+      return res.then(next);
     }, Promise.resolve(inInitial));
   };