npm install Error: rollbackFailedOptional

Question

When I try npm install new packages it shows me this error:

rollbackFailedOptional: verb npm-session 585aaecfe5f9a82

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Answer 1

Solution: The default value of ‘proxy’ and ‘https-proxy’ key of npm config is NULL. After doing some more R & D then I tried to set the proxy setting value to above key (this solution works in my scenario).

Also, the same proxy settings need to be applied in IE browser Internet Settings >> Settings >> LAN settings.

Conclusion: In corporate/some environment the proxy is a somewhat mandatory setting otherwise npm install will not work.

Issue on GitHub: https://github.com/SharePoint/sp-dev-docs/issues/3266

You can refer blog for detailed information https://blogs2share.blogspot.com/2019/01/spfx-environment-setup-error.html