npm install does not exit on windows 10

[AndyOGo]

I'm opening this issue because:

• npm is crashing.
• npm is producing an incorrect install.
• npm is doing something I don't understand.
• npm is producing incorrect or undesirable behavior.
• Other (see below for feature requests):

What's going wrong?

I run npm install on windows 10 within cmd.exe.
After installation is complete the prompt updates properly, but some spawned child-process do not exit and run forever and show up in my TaskManager.

How can the CLI team reproduce the problem?

1. Open TaskManager
2. run npm install of any npm project
3. monitor the task manager - you will observe that some node scripts never die 😕

supporting information:

• npm -v prints: 5
• node -v prints: tried with node 6 and latest 10 - same result
• npm config get registry prints:
• Windows, OS X/macOS, or Linux?: Windows
• Network issues:
  • Geographic location where npm was run:
  • I use a proxy to connect to the npm registry.
  • I use a proxy to connect to the web.
  • I use a proxy when downloading Git repos.
  • I access the npm registry via a VPN
  • I don't use a proxy, but have limited or unreliable internet access.
• Container:
  • I develop using Vagrant on Windows.
  • I develop using Vagrant on OS X or Linux.
  • I develop / deploy using Docker.
  • I deploy to a PaaS (Triton, Heroku).