the package is not in NPM registry

[jacksonwalker165]

npm i --save @m19c/graphql-firestore-subscriptions npm ERR! code E404 npm ERR! 404 Not Found - GET https://registry.npmjs.org/@m19c%2fgraphql-firestore-subscriptions - Not found npm ERR! 404 npm ERR! 404 '@m19c/graphql-firestore-subscriptions@*' is not in this registry.