diff --git a/src/server/session.ts b/src/server/session.ts
index 2db58d67460..03ed5e10f8c 100644
--- a/src/server/session.ts
+++ b/src/server/session.ts
@@ -42,6 +42,11 @@ namespace ts.server {
         return false;
     }
 
+
+    function dtsChangeCanAffectEmit(compilationSettings: CompilerOptions) {
+        return getEmitDeclarations(compilationSettings) || !!compilationSettings.emitDecoratorMetadata;
+    }
+
     function formatDiag(fileName: NormalizedPath, project: Project, diag: Diagnostic): protocol.Diagnostic {
         const scriptInfo = project.getScriptInfoForNormalizedPath(fileName)!; // TODO: GH#18217
         return {
@@ -1599,10 +1604,6 @@ namespace ts.server {
                 return emptyArray;
             }
 
-            function dtsChangeCanAffectEmit(compilationSettings: CompilerOptions) {
-                return getEmitDeclarations(compilationSettings) || !!compilationSettings.emitDecoratorMetadata;
-            }
-
             return combineProjectOutput(
                 info,
                 path => this.projectService.getScriptInfoForPath(path)!,