Fail to install npm package “npm ERR! errno -4048”

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Kill whatever process is locking your files

It seems like this kind of error can be caused by a file permissions lock – I experienced something very similar (the same ERRNO: -4048) when installing whatwg-fetch.

I found that a Visual Studio instance I had open at the same time was acquiring all kinds of files which it didn’t need. Once I closed that down, the install worked perfectly.

This may be a quickly-checked possible cause to eliminate before moving on to more drastic measures…

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