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[Docs] Add `--latest-npm` info to Migrating global packages section 

Adds the following information to the "Migrating global packages while installing" section:
- notification that the npm package is explicitly not updated when using the --reinstall-packages-from flag
- information about the --latest-npm flag
- recovery instructions if a user has already updated node with an incompatible npm version
metasean 2018-12-30 18:24:29 -07:00 committed by Jordan Harband
parent 3cc9525dce
commit 970cadf258
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@ -291,6 +291,22 @@ nvm install 6 --reinstall-packages-from=5
nvm install v4.2 --reinstall-packages-from=iojs
```
Note that reinstalling packages _explicitly does not update the npm version_ — this is to ensure that npm isn't accidentally upgraded to a broken version for the new node version.
To update npm at the same time add the `--latest-npm` flag, like this:
```sh
nvm install lts/* --reinstall-packages-from=default --latest-npm
```
or, you can at any time run the following command to get the latest supported npm version on the current node version:
```sh
nvm install-latest-npm
```
If you've already gotten an error to the effect of "npm does not support Node.js", you'll need to (1) revert to a previous node version (`nvm ls` & `nvm use <your latest _working_ version from the ls>`, (2) delete the newly created node version (`nvm uninstall <your _broken_ version of node from the ls>`), then (3) rerun your `nvm install` with the `--latest-npm` flag.
### Default global packages from file while installing
If you have a list of default packages you want installed every time you install a new version, we support that too -- just add the package names, one per line, to the file `$NVM_DIR/default-packages`. You can add anything npm would accept as a package argument on the command line.