While using in the manifest composer-scripts I just assumed its the scripts part of the composer.json and thats currently not 😅 .

It would be nice to be able to define them like

{
"composer-commands": {
"build-js": "npm run build"
}
}

and then I can run them with composer run build-js. This works already out of the box with Composer when its in the correct key set 😅