SharePoint Framework

Run specific generator version

Note: yo must not be globally installed

npx -p yo -p @microsoft/generator-sharepoint@1.21.1 -- yo @microsoft/sharepoint --skip-install

or other options

--package-manager pnpm

Remove an app 

$name = '*somename*'
$app = Get-PnPApp -Scope Site | Where-Object {$_.Title -like $name}

Uninstall-PnPApp -Identity $app.id -Scope Site
Remove-PnPApp -Identity $app.id -Scope Site

Using M365 CLI

$id = m365 spo app list -u https://tenant/sites/mysite -s sitecollection
m365 spo app uninstall -i $id --appCatalogScope sitecollection -s https://tenant/sites/mysite
m365 spo app remove -i $id -s sitecollection -u https://tenant/sites/mysite

Create a site collection app catalog

Before running the following script, connect to your SharePoint Online tenant using the Connect-SPOService or the PnP version Connect-PnPOnline.

Add-SPOSiteCollectionAppCatalog -Site https://contoso.sharepoint.com/sites/marketing

or

Add-PnPSiteCollectionAppCatalog -site https://contoso.sharepoint.com/sites/marketing

Reference Create site collection app catalog

Learn more about SPFx development: