Use updateGraphIfDirty to do quick check if project update is needed

With this updateGraph is used only in locations we are certain project is dirty

Author: sheetalkamat

src/server/editorServices.ts

@@ -337,7 +337,8 @@ namespace ts.server {
         return `Project: ${project ? project.getProjectName() : ""} WatchType: ${watchType}`;
     }
 
-    function updateProjectIfDirty(project: Project) {
+    /*@internal*/
+    export function updateProjectIfDirty(project: Project) {
         return project.dirty && project.updateGraph();
     }
 
@@ -617,7 +618,7 @@ namespace ts.server {
             this.pendingProjectUpdates.set(projectName, project);
             this.throttledOperations.schedule(projectName, /*delay*/ 250, () => {
                 if (this.pendingProjectUpdates.delete(projectName)) {
-                    project.updateGraph();
+                    updateProjectIfDirty(project);
                 }
             });
         }
@@ -2148,7 +2149,7 @@ namespace ts.server {
         private findExternalProjectContainingOpenScriptInfo(info: ScriptInfo): ExternalProject | undefined {
             return find(this.externalProjects, proj => {
                 // Ensure project structure is up-to-date to check if info is present in external project
-                proj.updateGraph();
+                updateProjectIfDirty(proj);
                 return proj.containsScriptInfo(info);
             });
         }

src/server/project.ts

@@ -164,12 +164,12 @@ namespace ts.server {
         private readonly cancellationToken: ThrottledCancellationToken;
 
         public isNonTsProject() {
-            this.updateGraph();
+            updateProjectIfDirty(this);
             return allFilesAreJsOrDts(this);
         }
 
         public isJsOnlyProject() {
-            this.updateGraph();
+            updateProjectIfDirty(this);
             return hasOneOrMoreJsAndNoTsFiles(this);
         }
 
@@ -459,7 +459,7 @@ namespace ts.server {
 
         getLanguageService(ensureSynchronized = true): LanguageService {
             if (ensureSynchronized) {
-                this.updateGraph();
+                updateProjectIfDirty(this);
             }
             return this.languageService;
         }
@@ -477,7 +477,7 @@ namespace ts.server {
             if (!this.languageServiceEnabled) {
                 return [];
             }
-            this.updateGraph();
+            updateProjectIfDirty(this);
             this.builderState = BuilderState.create(this.program, this.projectService.toCanonicalFileName, this.builderState);
             return mapDefined(BuilderState.getFilesAffectedBy(this.builderState, this.program, scriptInfo.path, this.cancellationToken, data => this.projectService.host.createHash!(data)), // TODO: GH#18217
                 sourceFile => this.shouldEmitFile(this.projectService.getScriptInfoForPath(sourceFile.path)!) ? sourceFile.fileName : undefined);
@@ -1025,7 +1025,7 @@ namespace ts.server {
 
         /* @internal */
         getChangesSinceVersion(lastKnownVersion?: number): ProjectFilesWithTSDiagnostics {
-            this.updateGraph();
+            updateProjectIfDirty(this);
 
             const info: protocol.ProjectVersionInfo = {
                 projectName: this.getProjectName(),

src/server/session.ts

@@ -695,7 +695,7 @@ namespace ts.server {
                 const { fileName, project } = checkList[index];
                 index++;
                 // Ensure the project is upto date before checking if this file is present in the project
-                project.updateGraph();
+                updateProjectIfDirty(project);
                 if (!project.containsFile(fileName, requireOpen)) {
                     return;
                 }
@@ -1084,7 +1084,7 @@ namespace ts.server {
 
         private getProjectInfoWorker(uncheckedFileName: string, projectFileName: string | undefined, needFileNameList: boolean, excludeConfigFiles: boolean) {
             const { project } = this.getFileAndProjectWorker(uncheckedFileName, projectFileName);
-            project.updateGraph();
+            updateProjectIfDirty(project);
             const projectInfo = {
                 configFileName: project.getProjectName(),
                 languageServiceDisabled: !project.languageServiceEnabled,