Create a tarball from a package
npm pack [[<@scope>/]<pkg>...]
For anything that's installable (that is, a package folder, tarball,
tarball url, name@tag, name@version, name, or scoped name), this
command will fetch it to the cache, and then copy the tarball to the
current working directory as <name>-<version>.tgz, and then write
the filenames out to stdout.
If the same package is specified multiple times, then the file will be overwritten the second time.
If no arguments are supplied, then npm packs the current package folder.