diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index b9d22206c0e35..6f4e3532135e9 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -7291,6 +7291,7 @@ declare namespace ts.server {
         private syntacticCheck;
         private infoCheck;
         private sendDiagnosticsEvent;
+        /** It is the caller's responsibility to verify that `!this.suppressDiagnosticEvents`. */
         private updateErrorCheck;
         private cleanProjects;
         private cleanup;
@@ -7819,6 +7820,7 @@ declare namespace ts.server {
         useInferredProjectPerProjectRoot: boolean;
         typingsInstaller: ITypingsInstaller;
         eventHandler?: ProjectServiceEventHandler;
+        suppressDiagnosticEvents?: boolean;
         throttleWaitMilliseconds?: number;
         globalPlugins?: ReadonlyArray<string>;
         pluginProbeLocations?: ReadonlyArray<string>;
@@ -7885,6 +7887,7 @@ declare namespace ts.server {
         readonly typingsInstaller: ITypingsInstaller;
         readonly throttleWaitMilliseconds?: number;
         private readonly eventHandler?;
+        private readonly suppressDiagnosticEvents?;
         readonly globalPlugins: ReadonlyArray<string>;
         readonly pluginProbeLocations: ReadonlyArray<string>;
         readonly allowLocalPluginLoads: boolean;