Typescript error on plugin schema reference field

Object literal may only specify known properties, but 'reference' does not exist in type 'FieldAttribute<FieldType>'. Did you mean to write 'references'?ts(2561)
auth-C42JqOR9.d.ts(1893, 17): The expected type comes from property 'userId' which is declared here on type '{ [x: string]: FieldAttribute<FieldType>; }'
(property) reference: {
    model: string;
    field: string;
    onDelete: string;
}

 fields: {
          userId: {
            type: 'string',
            required: true,
            unique: true,
            reference: {
              model: 'user',
              field: 'id',
              onDelete: 'cascade',
            },
          },