diff --git a/tsconfig.json b/tsconfig.json
index 1f60ce6..bde4bab 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -14,7 +14,9 @@
       "DOM",
       "ES5",
       "ES6",
-      "ES7"
+      "ES7",
+      "ES2017.String",
+      "ES2020.Promise"
     ]
   },
   "include": [