Manage package owners.
npm owner add <user> [<@scope>/]<pkg> npm owner rm <user> [<@scope>/]<pkg> npm owner ls [<@scope>/]<pkg>
Manage ownership of published packages.
Note that there is only one level of access. Either you can modify a package, or you can't. Future versions may contain more fine-grained access levels, but that is not implemented at this time.
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https://docs.npmjs.com/cli/owner