Composer recently made a change with the way pre-update-command works and it can cause Laravel to fail to install.
Jordi Boggiano gave the following reason for the change:
as there is no composer.lock file the initial “install” is instead doing an update (as of this afternoon), which triggers the pre-update-cmd, while this was previously triggering pre-install-cmd.
Luckily the fix is easy and only requires a moving the php artisan clear-compiled to the post-update-command:
You can see the complete changelog here.
