diff --git a/package-lock.json b/package-lock.json
index 4d30bbe..589b41f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1809,6 +1809,12 @@
       "integrity": "sha1-tAPQuRvlDDMd/EuC7s6yLD3hbSA=",
       "dev": true
     },
+    "typescript": {
+      "version": "3.8.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.8.3.tgz",
+      "integrity": "sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==",
+      "dev": true
+    },
     "union-value": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
diff --git a/package.json b/package.json
index ba476ea..ac657ba 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
   "devDependencies": {
     "antlr4ts-cli": "^0.5.0-alpha.3",
     "cpy-cli": "^3.1.0",
-    "rimraf": "^3.0.2"
+    "rimraf": "^3.0.2",
+    "typescript": "^3.8.3"
   }
 }