Handle untitled files from vscode which are of format: untitled:^Untitled-1

src/server/editorServices.ts

@@ -1304,7 +1304,7 @@ namespace ts.server {
             // Closing file should trigger re-reading the file content from disk. This is
             // because the user may chose to discard the buffer content before saving
             // to the disk, and the server's version of the file can be out of sync.
-            const fileExists = this.host.fileExists(info.fileName);
+            const fileExists = info.isDynamic ? false : this.host.fileExists(info.fileName);
             info.close(fileExists);
             this.stopWatchingConfigFilesForClosedScriptInfo(info);
 

src/server/scriptInfo.ts

@@ -272,7 +272,8 @@ namespace ts.server {
 
     /*@internal*/
     export function isDynamicFileName(fileName: NormalizedPath) {
-        return fileName[0] === "^";
+        return fileName[0] === "^" ||
+            (stringContains(fileName, ":^") && !stringContains(fileName, directorySeparator));
     }
 
     /*@internal*/

src/testRunner/unittests/tsserver/externalProjects.ts

@@ -221,6 +221,7 @@ namespace ts.projectSystem {
 
             checkNumberOfExternalProjects(projectService, 1);
             checkNumberOfInferredProjects(projectService, 0);
+            verifyDynamic(projectService, "/^scriptdocument1 file1.ts");
 
             externalFiles[0].content = "let x =1;";
             projectService.applyChangesInOpenFiles(arrayIterator(externalFiles));

src/testRunner/unittests/tsserver/projects.ts

@@ -1094,6 +1094,7 @@ namespace ts.projectSystem {
             const project = projectService.inferredProjects[0];
             checkProjectRootFiles(project, [file.path]);
             checkProjectActualFiles(project, [file.path, libFile.path]);
+            verifyDynamic(projectService, `/${file.path}`);
 
             assert.strictEqual(projectService.ensureDefaultProjectForFile(server.toNormalizedPath(file.path)), project);
             const indexOfX = file.content.indexOf("x");
@@ -1124,6 +1125,7 @@ var x = 10;`
             const host = createServerHost([libFile]);
             const projectService = createProjectService(host);
             projectService.openClientFile(file.path, file.content);
+            verifyDynamic(projectService, projectService.toPath(file.path));
 
             projectService.checkNumberOfProjects({ inferredProjects: 1 });
             const project = projectService.inferredProjects[0];
@@ -1152,6 +1154,7 @@ var x = 10;`
                 const projectService = session.getProjectService();
                 checkNumberOfProjects(projectService, { inferredProjects: 1 });
                 checkProjectActualFiles(projectService.inferredProjects[0], [file.path, libFile.path]);
+                verifyDynamic(projectService, `${tscWatch.projectRoot}/${file.path}`);
 
                 session.executeCommandSeq<protocol.OutliningSpansRequest>({
                     command: protocol.CommandTypes.GetOutliningSpans,

src/testRunner/unittests/tsserver/untitledFiles.ts

@@ -1,20 +1,25 @@
 namespace ts.projectSystem {
+    export function verifyDynamic(service: server.ProjectService, path: string) {
+        const info = Debug.assertDefined(service.filenameToScriptInfo.get(path), `Expected ${path} in :: ${JSON.stringify(arrayFrom(service.filenameToScriptInfo.entries(), ([key, f]) => ({ key, fileName: f.fileName, path: f.path })))}`);
+        assert.isTrue(info.isDynamic);
+    }
+
     describe("unittests:: tsserver:: Untitled files", () => {
+        const untitledFile = "untitled:^Untitled-1";
         it("Can convert positions to locations", () => {
             const aTs: File = { path: "/proj/a.ts", content: "" };
             const tsconfig: File = { path: "/proj/tsconfig.json", content: "{}" };
-            const session = createSession(createServerHost([aTs, tsconfig]));
+            const session = createSession(createServerHost([aTs, tsconfig]), { useInferredProjectPerProjectRoot: true });
 
             openFilesForSession([aTs], session);
 
-            const untitledFile = "untitled:^Untitled-1";
             executeSessionRequestNoResponse<protocol.OpenRequest>(session, protocol.CommandTypes.Open, {
                 file: untitledFile,
                 fileContent: `/// <reference path="../../../../../../typings/@epic/Core.d.ts" />\nlet foo = 1;\nfooo/**/`,
                 scriptKindName: "TS",
                 projectRootPath: "/proj",
             });
-
+            verifyDynamic(session.getProjectService(), `/proj/untitled:^untitled-1`);
             const response = executeSessionRequest<protocol.CodeFixRequest, protocol.CodeFixResponse>(session, protocol.CommandTypes.GetCodeFixes, {
                 file: untitledFile,
                 startLine: 3,
@@ -41,5 +46,38 @@ namespace ts.projectSystem {
                 },
             ]);
         });
+
+        it("opening untitled files", () => {
+            const config: File = {
+                path: `${tscWatch.projectRoot}/tsconfig.json`,
+                content: "{}"
+            };
+            const host = createServerHost([config, libFile], { useCaseSensitiveFileNames: true, currentDirectory: tscWatch.projectRoot });
+            const service = createProjectService(host);
+            service.openClientFile(untitledFile, "const x = 10;", /*scriptKind*/ undefined, tscWatch.projectRoot);
+            checkNumberOfProjects(service, { inferredProjects: 1 });
+            checkProjectActualFiles(service.inferredProjects[0], [untitledFile, libFile.path]);
+            verifyDynamic(service, `${tscWatch.projectRoot}/${untitledFile}`);
+
+            const untitled: File = {
+                path: `${tscWatch.projectRoot}/Untitled-1.ts`,
+                content: "const x = 10;"
+            };
+            host.writeFile(untitled.path, untitled.content);
+            host.checkTimeoutQueueLength(0);
+            service.openClientFile(untitled.path, untitled.content, /*scriptKind*/ undefined, tscWatch.projectRoot);
+            checkNumberOfProjects(service, { configuredProjects: 1, inferredProjects: 1 });
+            checkProjectActualFiles(service.configuredProjects.get(config.path)!, [untitled.path, libFile.path, config.path]);
+            checkProjectActualFiles(service.inferredProjects[0], [untitledFile, libFile.path]);
+
+            service.closeClientFile(untitledFile);
+            checkProjectActualFiles(service.configuredProjects.get(config.path)!, [untitled.path, libFile.path, config.path]);
+            checkProjectActualFiles(service.inferredProjects[0], [untitledFile, libFile.path]);
+
+            service.openClientFile(untitledFile, "const x = 10;", /*scriptKind*/ undefined, tscWatch.projectRoot);
+            verifyDynamic(service, `${tscWatch.projectRoot}/${untitledFile}`);
+            checkProjectActualFiles(service.configuredProjects.get(config.path)!, [untitled.path, libFile.path, config.path]);
+            checkProjectActualFiles(service.inferredProjects[0], [untitledFile, libFile.path]);
+        });
     });
 }