Composer install Error

[mariusik88]

Preconditions

PHP 7.3

Magento Version : 2.3.4

ElasticSuite Version : 2.8.x

Environment : Default mode

Steps to reproduce

omposer require smile/elasticsuite ~2.8.0
./composer.json has been updated

Fatal error: Uncaught TypeError: Return value of Magento\InventoryComposerInstaller\Plugin_composer_tmp1::initModuleDeployment() must be an instance of Magento\InventoryComposerInstaller\void, none returned in phar:///opt/cpanel/composer/bin/composer/src/Composer/Plugin/PluginManager.php(195) : eval()'d code:69
Stack trace:
#0 [internal function]: Magento\InventoryComposerInstaller\Plugin_composer_tmp1->initModuleDeployment(Object(Composer\Script\Event))
#1 phar:///opt/cpanel/composer/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(176): call_user_func(Array, Object(Composer\Script\Event))
#2 phar:///opt/cpanel/composer/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(96): Composer\EventDispatcher\EventDispatcher->doDispatch(Object(Composer\Script\Event))
#3 phar:///opt/cpanel/composer/bin/composer/src/Composer/Installer.php(205): Composer\EventDispatcher\EventDispatcher->dispatchScript('pre-update-cmd', true)
#4 phar:///opt/cpanel/composer/bin/composer/src/Composer/Command/RequireCommand.php(20 in phar:///opt/cpanel/composer/bin/composer/src/Composer/Plugin/PluginManager.php(195) : eval()'d code on line 69

Expected result

Actual result

1. [Screenshot, logs]

[rbayet]

Hello @mariusik88,

I don't have any issue with composer 1.9 and PHP 7.2.24.

I would go for a general PHP compatibility issue, nothing specific to Elasticsuite, considering where the error is thrown.
I know that

Magento recommends using PHP 7.3

But give it a shot to either upgrade to the last available PHP 7.3 flavour or downgrade to the latest PHP 7.2...
If you google that error, you will find that error in many different contexts.

Regards

[romainruaud]

Our Travis instance is running daily Elasticsuite install from scratch, for all Magento 2.3.x versions on PHP 7.2 and 7.3, and there is no issue on Composer.

As previously said, you might have an issue related to using a too old Composer version (not supporting PHP 7.3) or something like this.

Since it's not related to Elasticsuite, I close.

regards