diff --git a/node/CHANGELOG.md b/node/CHANGELOG.md
index 722d4bee3..b53208324 100644
--- a/node/CHANGELOG.md
+++ b/node/CHANGELOG.md
@@ -35,4 +35,8 @@ Backported from ver.`3.4.0`:
 
 ## 4.2.0
 
-- Added unhandledRejection event - [#912](https://github.com/microsoft/azure-pipelines-task-lib/pull/912)
\ No newline at end of file
+- Added unhandledRejection event - [#912](https://github.com/microsoft/azure-pipelines-task-lib/pull/912)
+
+## 4.3.0
+
+- Described types for `argIf` - [#920](https://github.com/microsoft/azure-pipelines-task-lib/pull/920)
diff --git a/node/package-lock.json b/node/package-lock.json
index 247aa110b..1e91f0715 100644
--- a/node/package-lock.json
+++ b/node/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "azure-pipelines-task-lib",
-  "version": "4.2.0",
+  "version": "4.3.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/node/package.json b/node/package.json
index 8f0cb19e8..d5ea2f748 100644
--- a/node/package.json
+++ b/node/package.json
@@ -1,6 +1,6 @@
 {
   "name": "azure-pipelines-task-lib",
-  "version": "4.2.0",
+  "version": "4.3.0",
   "description": "Azure Pipelines Task SDK",
   "main": "./task.js",
   "typings": "./task.d.ts",
diff --git a/node/toolrunner.ts b/node/toolrunner.ts
index 8e0607c7b..7fbfb0635 100644
--- a/node/toolrunner.ts
+++ b/node/toolrunner.ts
@@ -853,7 +853,7 @@ export class ToolRunner extends events.EventEmitter {
      * @param     val     string cmdline or array of strings
      * @returns   ToolRunner
      */
-    public argIf(condition: any, val: any) {
+    public argIf(condition: unknown, val: string | string[]): ToolRunner {
         if (condition) {
             this.arg(val);
         }