diff --git a/src/tsconfig.base.json b/src/tsconfig.base.json
index b8dab46bfb6..19165d97b72 100644
--- a/src/tsconfig.base.json
+++ b/src/tsconfig.base.json
@@ -15,6 +15,7 @@
 		},
 		"lib": [
 			"ES2015",
+			"ES2017.String",
 			"ES2018.Promise",
 			"DOM",
 			"DOM.Iterable",