为什么在Windows cmd中运行npm install会失败，但是从git bash或vs终端运行时却可以正常工作？

Question

Tried running npm install -g @angular/cli

and got the below error consistently. Tried running it as administrator as well, yet no result.

23286 error path C:\Users\XX\AppData\Roaming\npm\ng
23287 error code EPERM
23288 error errno -4048
23289 error syscall open
23290 error Error: EPERM: operation not permitted, open 'C:\Users\XX\AppData\Roaming\npm\ng'
23290 error  { Error: EPERM: operation not permitted, open 'C:\Users\XX\AppData\Roaming\npm\ng'
23290 error   cause:
23290 error    { Error: EPERM: operation not permitted, open 'C:\Users\XX\AppData\Roaming\npm\ng'
23290 error      errno: -4048,
23290 error      code: 'EPERM',
23290 error      syscall: 'open',
23290 error      path: 'C:\\Users\\XX\\AppData\\Roaming\\npm\\ng' },
23290 error   stack: 'Error: EPERM: operation not permitted, open \'C:\\Users\\XX\\AppData\\Roaming\\npm\\ng\'',
23290 error   errno: -4048,
23290 error   code: 'EPERM',
23290 error   syscall: 'open',
23290 error   path: 'C:\\Users\\XX\\AppData\\Roaming\\npm\\ng' }
23291 error Please try running this command again as root/Administrator.
23292 verbose exit [ -4048, true ]

Answer 1

I'm not 100% sure about Windows, but this could happen if you're using the project folder somewhere else, or in a different tool, or an Anti-virus locking the the installation.

try running npm cache clean and then run npm install

Answer 2

there may be some process locking the installation.
But is this always going to be with trial and error. How can i identify which process is blocking it and see if i can do something about

Use Process Explorer (simple exe, no setup required): with it, you can type Ctrl + F and search for " Roaming\\npm " for instance.
Any process with an handle still open on that folder will be displayed.