fix: Disable the default timeout for requests on the LU build (#4295)

* Fix #4294 - Disable the default timeout for requests on the LU build step which can take > 2 minutes for large models

* update mocked request object to contain settimeout

Co-authored-by: Chris Whitten <christopher.whitten@microsoft.com>

Composer/packages/server/src/controllers/__tests__/project.test.ts

@@ -373,6 +373,7 @@ describe('publish luis files', () => {
         crossTrainConfig: {},
         luFiles: [],
       },
+      setTimeout: (msecs: number, callback: () => any): void => {},
     } as Request;
     await ProjectController.build(mockReq, mockRes);
     expect(mockRes.status).toHaveBeenCalled();

Composer/packages/server/src/controllers/project.ts

@@ -355,6 +355,11 @@ async function build(req: Request, res: Response) {
   const projectId = req.params.projectId;
   const user = await ExtensionContext.getUserFromRequest(req);
 
+  // Disable Express' built in 2 minute timeout for requests. Otherwise, large models may fail to build.
+  req.setTimeout(0, () => {
+    throw new Error('LUIS publish process timed out.');
+  });
+
   const currentProject = await BotProjectService.getProjectById(projectId, user);
   if (currentProject !== undefined) {
     try {