Listing globally installed packages

I have some `~/bin` scripts with `node` shebang and was wondering how to list those `--global` packages I use.

`npm list --global` vs `thanks --global`

I have `node` installed via `nvm`, so I tried manually going to `node_modules` directory. Unfortunately, it does not seem like `npm` maintains `package.json` for `--global`ly installed packages and `thanks` hangs forever in case that file is missing:

``` sh
$ cd .nvm/versions/node/v8.9.4/lib/node_modules
$ thanks
💙 Reading direct dependencies from metadata in package.json...(node:31267) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): TypeError: path must be a string or Buffer
(node:31267) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
💛 Reading direct dependencies from metadata in package.json...^C⏎
```

Start by reproducing the reported commands, especially `thanks` from the global Node modules directory under nvm, and inspect how global package metadata is located. Done means globally installed packages can be listed and a missing package.json is handled without hanging or producing an unhandled rejection.

Written by the indexing model from the issue text.