diff --git a/src/compiler/factory.ts b/src/compiler/factory.ts
index 4598872023fd5..575514ee2f7d7 100644
--- a/src/compiler/factory.ts
+++ b/src/compiler/factory.ts
@@ -3707,7 +3707,7 @@ namespace ts { // eslint-disable-line no-redeclare
             };`
     };
 
-    export function createSpreadArraysHelper(context: TransformationContext, argumentList: ReadonlyArray<Expression>, location?: TextRange) {
+    export function createSpreadArraysHelper(context: TransformationContext, argumentList: readonly Expression[], location?: TextRange) {
         context.requestEmitHelper(spreadArraysHelper);
         return setTextRange(
             createCall(