diff --git a/.gitignore b/.gitignore
index 431acf6..a5dfd13 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@
 **/npm-debug.log
 **/node_modules
 package-lock.json
+yarn.lock
 .history
diff --git a/types/nx.static.d.ts b/types/nx.static.d.ts
index 4d94627..3c2b3f7 100644
--- a/types/nx.static.d.ts
+++ b/types/nx.static.d.ts
@@ -13,6 +13,10 @@ interface NxStatic {
    * A symbol for break.
    */
   BREAKER: {};
+  /**
+   * A symbol for nil.
+   */
+  NIL: {};
 
   /**
    * Stub code for void function.