This is the metapackage that bundles all the different GraphQL modules required for Velvet.
Since it is still in active development, no stable tags have been created yet.
If you wish to install it you should first lower your minumum stability:
{
"minimum-stability": "dev",
"prefer-stable": true
}You can then proceed to install the module:
composer require --prefer-source danslo/magento2-module-velvet
bin/magento setup:upgrade
bin/magento cache:flush