Alternative to custom installers with Composer 2.1+

As of Composer 2.1, the Composer\InstalledVersions class has a getInstalledPackagesByType method which can let you figure out at runtime which plugins/modules/extensions are installed.

It is highly recommended to use that instead of building new custom installers if you are building a new application. This has the advantage of leaving all vendor code in the vendor directory, and not requiring custom installer code.

Changelog

Added

• Type declarations have been added everywhere to support PHPStan level 8 (#491)
• Added installer for Pantheon Quicksilver modules/scripts #492.
• Added installer for Akaunting modules #489.

Changed

• Minimum supported PHP version is now 7.2 (#491)
• Installer::getInstallPath() now returns absolute paths instead of relative ones previously (#307)

Removed

• Removed support for Kirby
• Removed support for Symfony1
• Removed support for Joomla
• Removed support for TYPO3 CMS
• Removed support for Craft
• Removed support for Pimcore
• Removed support for TYPO3 Flow