diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index c43f28c6e90..31e58363935 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -3525,6 +3525,7 @@ declare namespace ts {
     function isCallExpression(node: Node): node is CallExpression;
     function isCallChain(node: Node): node is CallChain;
     function isOptionalChain(node: Node): node is PropertyAccessChain | ElementAccessChain | CallChain;
+    function isQuestionQuestionExpression(node: Node): boolean;
     function isNewExpression(node: Node): node is NewExpression;
     function isTaggedTemplateExpression(node: Node): node is TaggedTemplateExpression;
     function isTypeAssertion(node: Node): node is TypeAssertion;
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index e84b948c938..47fcde5f479 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -3525,6 +3525,7 @@ declare namespace ts {
     function isCallExpression(node: Node): node is CallExpression;
     function isCallChain(node: Node): node is CallChain;
     function isOptionalChain(node: Node): node is PropertyAccessChain | ElementAccessChain | CallChain;
+    function isQuestionQuestionExpression(node: Node): boolean;
     function isNewExpression(node: Node): node is NewExpression;
     function isTaggedTemplateExpression(node: Node): node is TaggedTemplateExpression;
     function isTypeAssertion(node: Node): node is TypeAssertion;