Support NPX for npm v5+/n8+

[sullivanpt]

This change request is to add support for NPX to nvm-windows.

This is an enhancement request inspired by Introducing npx: an npm package runner. When nodejs v8+ is installed traditionally (without nvm-windows) it includes npm v5+ and the new utility "npx".

Expected Behavior after this enhancement

$ nvm use 6.11.0
Now using node v8.1.4 (64-bit)
$ npx --version
npx is not supported with the current version of npm
$ nvm use 8.1.4
Now using node v8.1.4 (64-bit)
$ npx --version
5.0.3

[coreybutler]

This is an npm workflow concern, not a node versioning concern.

Node 8.1.4 ships with npm 5.0.3. No version of node ships with npm 5.2.0 yet (the first version of npm to support npx). When node eventually starts shipping with npm 5.2.0, npx will be available. There is no need to do anything within nvm-windows to accomplish this. In the meantime, users can upgrade npm as the article suggests.

[sullivanpt]

Sorry, I didn't realize npx was not included yet. However, I'd like to re-open this ticket as nvm-windows would still need modification to support npx. See line 270 of src/nvm.go has a comment and code for "Copy the npm and npm.cmd files to the installation directory".

As an aside, yes I realize I'm being lazy but not submitting a PR. I am being hopeful someone else will volunteer. :)

[coreybutler]

We'll see if this even remains (probably will, but maybe not in it's current form). The version management group is actively discussing the Windows installation process now, which will have an impact on this. It remains to be seen if this will end up being entirely the responsibility of npm or not, and the most likely answer is that it will.

[ScottFreeCode]

Ironically, roughly six hours later (insert "The Lego Movie"-style image here): https://github.com/nodejs/node/blob/master/doc/changelogs/CHANGELOG_V8.md#8.2.0

◦The npm CLI has been updated to version 5.3.0. In particular, it now comes with the npx binary, which is also shipped with Node.

I've confirmed I get npx if I install Node on Windows through the official installer.

However, npx is not available after performing nvm install 8.2.0 and then nvm use 8.2.0.

(On the other hand, the version of npx I got with the official installer happens to be completely broken on Windows, so installing the same version with nvm-windows isn't going to help till they get that fixed, heh heh.)

[coreybutler]

I added support for this in the master branch, since it is now shipping with Node 8.2.0. As @ScottFreeCode pointed out, it's pretty broken... but the install is complete. The experience is the same as a native install (for better or worse)

I'm still waiting for feedback regarding issues that should be resolved in 1.1.6. Once those are all settled, I'll cut a new release file (still 1.1.6) with the new additions from ce75602.

[fmaiabatista]

Hi, it seems that this is still a problem.

I have a fresh install of nvm after which I installed both node@10.4.0 + npm@6.1.0 and node@8.11.2 + npm@5.6.0

Doing npx --version gives npx: command not found for both.

What happens if I npm i -g npx? Does this interfere with nvm management?

Using Win7 64x.

[Cellv2]

Having the same issue as above. My versions are node@8.11.3 + npm@5.6.0 and node@10.6.0 + npm@6.1.0. Not sure whether it's worth mentioning that I installed node 10.6.0 first and 8.11.3 second.

[zladuric]

Can confirm. I have had 8.x for some half a year, yesterday I've installed node 10.6 and got no npx:

C:\Users\duricz>npx
'npx' is not recognized as an internal or external command,
operable program or batch file.

C:\Users\duricz>nvm v
1.1.6

C:\Users\duricz>node -v
v10.6.0

C:\Users\duricz>npm -v
6.1.0

C:\Users\duricz>```