Como utilizar yarn para gerar as seeds

Se instalar esse sequelize-cli como dependência de desenvolvimento (npm i -D sequelize-cli), pode invocar ele com o yarn:yarn sequelize-cli seed:generate --name demo-nivelnão sei se resolve.

Mas para resolver esse problema do ENOLOCAL, pelo o que eu li aqui, você pode tentar executar npm config set cache "C:\Users\Firstname~1\AppData\Roaming\npm-cache" --global num prompt com permissões de administrador (substituindo Firstname pelo primeiro nome do teu usuário do Windows)

Infelizmente não resolveu, tentei aqui e o erro continuou porém agora com o ~1 segue erro:

Installing eslint-plugin-react@latest, eslint-config-airbnb@latest, error@[object Object]
npm ERR! code EPERM
npm ERR! syscall mkdir
npm ERR! path C:\Users\Geraldo~1
npm ERR! errno -4048
npm ERR! Error: EPERM: operation not permitted, mkdir 'C:\Users\Geraldo~1'
npm ERR!  [OperationalError: EPERM: operation not permitted, mkdir 'C:\Users\Geraldo~1'] {
npm ERR!   cause: [Error: EPERM: operation not permitted, mkdir 'C:\Users\Geraldo~1'] {
npm ERR!     errno: -4048,
npm ERR!     code: 'EPERM',
npm ERR!     syscall: 'mkdir',
npm ERR!     path: 'C:\\Users\\Geraldo~1'
npm ERR!   },
npm ERR!   isOperational: true,
npm ERR!   errno: -4048,
npm ERR!   code: 'EPERM',
npm ERR!   syscall: 'mkdir',
npm ERR!   path: 'C:\\Users\\Geraldo~1'
npm ERR! }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It's possible that the file was already in use (by a text editor or antivirus),
npm ERR! or that you lack permissions to access it.
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator.
npm ERR! code EPERM
npm ERR! syscall mkdir
npm ERR! path C:\Users\Geraldo~1
npm ERR! errno -4048
npm ERR! Error: EPERM: operation not permitted, mkdir 'C:\Users\Geraldo~1'
npm ERR!  [OperationalError: EPERM: operation not permitted, mkdir 'C:\Users\Geraldo~1'] {
npm ERR!   cause: [Error: EPERM: operation not permitted, mkdir 'C:\Users\Geraldo~1'] {
npm ERR!     errno: -4048,
npm ERR!     code: 'EPERM',
npm ERR!     syscall: 'mkdir',
npm ERR!     path: 'C:\\Users\\Geraldo~1'
npm ERR!   },
npm ERR!   isOperational: true,
npm ERR!   errno: -4048,
npm ERR!   code: 'EPERM',
npm ERR!   syscall: 'mkdir',
npm ERR!   path: 'C:\\Users\\Geraldo~1'
npm ERR! }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It's possible that the file was already in use (by a text editor or antivirus),
npm ERR! or that you lack permissions to access it.
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator.

Nesse caso a instalação que estou fazendo é do ESLint, porém o erro é pelo mesmo motivo: o espaço no nome