Reset the noEmitForJsFiles option when updating compiler options (#12…

src/harness/unittests/tsserverProjectSystem.ts

@@ -2728,6 +2728,65 @@ namespace ts.projectSystem {
                 arguments: { projectFileName: projectName }
             }).response;
             assert.isTrue(diags.length === 0);
+
+            session.executeCommand(<server.protocol.SetCompilerOptionsForInferredProjectsRequest>{
+                type: "request",
+                command: server.CommandNames.CompilerOptionsForInferredProjects,
+                seq: 3,
+                arguments: { options: { module: ModuleKind.CommonJS } }
+            });
+            const diagsAfterUpdate = session.executeCommand(<server.protocol.CompilerOptionsDiagnosticsRequest>{
+                type: "request",
+                command: server.CommandNames.CompilerOptionsDiagnosticsFull,
+                seq: 4,
+                arguments: { projectFileName: projectName }
+            }).response;
+            assert.isTrue(diagsAfterUpdate.length === 0);
+        });
+
+        it("for external project", () => {
+            const f1 = {
+                path: "/a/b/f1.js",
+                content: "function test1() { }"
+            };
+            const host = createServerHost([f1, libFile]);
+            const session = createSession(host);
+            const projectService = session.getProjectService();
+            const projectFileName = "/a/b/project.csproj";
+            const externalFiles = toExternalFiles([f1.path]);
+            projectService.openExternalProject(<protocol.ExternalProject>{
+                projectFileName,
+                rootFiles: externalFiles,
+                options: {}
+            });
+
+            checkNumberOfProjects(projectService, { externalProjects: 1 });
+
+            const diags = session.executeCommand(<server.protocol.CompilerOptionsDiagnosticsRequest>{
+                type: "request",
+                command: server.CommandNames.CompilerOptionsDiagnosticsFull,
+                seq: 2,
+                arguments: { projectFileName }
+            }).response;
+            assert.isTrue(diags.length === 0);
+
+            session.executeCommand(<server.protocol.OpenExternalProjectRequest>{
+                type: "request",
+                command: server.CommandNames.OpenExternalProject,
+                seq: 3,
+                arguments: {
+                    projectFileName,
+                    rootFiles: externalFiles,
+                    options: { module: ModuleKind.CommonJS }
+                }
+            });
+            const diagsAfterUpdate = session.executeCommand(<server.protocol.CompilerOptionsDiagnosticsRequest>{
+                type: "request",
+                command: server.CommandNames.CompilerOptionsDiagnosticsFull,
+                seq: 4,
+                arguments: { projectFileName }
+            }).response;
+            assert.isTrue(diagsAfterUpdate.length === 0);
         });
     });
 

src/server/project.ts

@@ -248,9 +248,7 @@ namespace ts.server {
                 this.compilerOptions.allowNonTsExtensions = true;
             }
 
-            if (this.projectKind === ProjectKind.Inferred || this.projectKind === ProjectKind.External) {
-                this.compilerOptions.noEmitForJsFiles = true;
-            }
+            this.setInternalCompilerOptionsForEmittingJsFiles();
 
             this.lsHost = new LSHost(this.projectService.host, this, this.projectService.cancellationToken);
             this.lsHost.setCompilationSettings(this.compilerOptions);
@@ -266,6 +264,12 @@ namespace ts.server {
             this.markAsDirty();
         }
 
+        private setInternalCompilerOptionsForEmittingJsFiles() {
+            if (this.projectKind === ProjectKind.Inferred || this.projectKind === ProjectKind.External) {
+                this.compilerOptions.noEmitForJsFiles = true;
+            }
+        }
+
         getProjectErrors() {
             return this.projectErrors;
         }
@@ -637,6 +641,7 @@ namespace ts.server {
                     this.lastCachedUnresolvedImportsList = undefined;
                 }
                 this.compilerOptions = compilerOptions;
+                this.setInternalCompilerOptionsForEmittingJsFiles();
                 this.lsHost.setCompilationSettings(compilerOptions);
 
                 this.markAsDirty();