Fetch metadata for a package from the npm registry. Requires a package name and optionally accepts a version, dist-tag, or semver range (defaults to "latest"). By default an abbreviated metadata document is returned for performance; set fullMetadata to true for the complete document. Set allVersions to true to get the registry's main entry containing every version (this takes precedence over version). Works with scoped and private packages, honouring .npmrc registry and auth settings.

List published version numbers and dist-tags for a package from the npm registry, newest first. Useful for checking what versions exist before requesting metadata for a specific one.