After setting up a new project with the "Basic Node.js Express 4 Application" template, I noticed some errors have already surfaced:
https://i.sstatic.net/8jbYt.png
Could this be a Visual Studio issue? Any pointers on resolving these errors?
After setting up a new project with the "Basic Node.js Express 4 Application" template, I noticed some errors have already surfaced:
https://i.sstatic.net/8jbYt.png
Could this be a Visual Studio issue? Any pointers on resolving these errors?
When initiating a new project with this template, Visual Studio will automatically run npm install in the background to fetch necessary packages and type information from the npm registry. During this process, you may encounter temporary errors in the editor until all the required information is downloaded.
The execution of npm install might consume up to 2 minutes depending on your network speed and disk performance. If you do not see the message indicating the completion of the npm command, it means that the installation is still in progress, and it's a good time to grab a quick coffee while waiting for it to finish. Once the installation is completed, Visual Studio will automatically update the Intellisense errors for you.
If even after waiting for some time the errors persist, the first step to troubleshoot the issue is to inspect the Output window to monitor the progress of the ongoing npm install operation. Simply select View -> Output from the top menu, and in the Output Window, choose Npm from the dropdown menu labeled Show output from:
https://i.sstatic.net/OrUXi.png
Based on the observations in the output window, the next steps can be determined.
Due to an issue stemming from npm's staging behavior, graceful-fs, and the Win32 MoveFileEx API, there is a possibility of random failures in the npm install process. If an error trace appears in the Output Window resembling the following:
npm ERR! path C:\Users\ryanca\source\repos\ExpressApp41\ExpressApp41\node_modules\@types\debug\package.json.2541088048
npm ERR! code EPERM
npm ERR! errno -4048
...
====npm command completed with exit code -4048====
DO NOT heed npm's recommendation to rerun the command as an Administrator; this may exacerbate the situation. Execute npm install from a regular command line or choose Install Missing npm Packages from the npm node in the Solution Explorer:
https://i.sstatic.net/WhGLX.png
Keep in mind that this action will trigger another npm install, which might potentially fail again, though the chances are slim.
In rare cases, some users have experienced persistent failures in npm install. In such improbable situations, consider closing the solution, executing npm install from the command line, and then reopening the solution. However, this should not be necessitated under normal circumstances. Should npm install continue to fail even without Visual Studio running, it indicates a separate issue, like a corrupted npm cache, disk error, or an unaddressed npm bug beyond the scope of this response.
The bug leading to EPERM errors was introduced in npm version 5. If this poses significant challenges, consider reverting to any 4.x.x version. Although the issue remains unresolved at the moment, there's hope for a future npm release with the graceful-fs bug fix. Eventually, an upgrade should suffice the correction.
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