If there are no open files, do not schedule ensureProjectForOpenFiles

Author: sheetalkamat

src/server/editorServices.ts

@@ -930,6 +930,7 @@ namespace ts.server {
 
         /*@internal*/
         delayEnsureProjectForOpenFiles() {
+            if (!this.openFiles.size) return;
             this.pendingEnsureProjectForOpenFiles = true;
             this.throttledOperations.schedule(ensureProjectForOpenFileSchedule, /*delay*/ 2500, () => {
                 if (this.pendingProjectUpdates.size !== 0) {

src/testRunner/unittests/tsserver/inferredProjects.ts

@@ -450,5 +450,15 @@ namespace ts.projectSystem {
             };
             assert.deepEqual(inferredProject.getTypeAcquisition(), expected, "typeAcquisition should be inferred for inferred projects");
         });
+
+        it("Setting compiler options for inferred projects when there are no open files should not schedule any refresh", () => {
+            const host = createServerHost([commonFile1, libFile]);
+            const projectService = createProjectService(host);
+            projectService.setCompilerOptionsForInferredProjects({
+                allowJs: true,
+                target: ScriptTarget.ES2015
+            });
+            host.checkTimeoutQueueLength(0);
+        });
     });
 }