src/Composer/Installer/SuggestedPackagesReporter.php
public function addPackage($source, $target, $reason)
    {
        $this->suggestedPackages[] = array(
            'source' => $source,
            'target' => $target,
            'reason' => $reason,
        );

        return $this;
    }
public function addPackage($source, $target, $reason)
    {
        $this->suggestedPackages[] = array(
            'source' => $source,
            'target' => $target,
            'reason' => $reason,
        );

        return $this;
    }
Add suggested packages to be listed after install

Could be used to add suggested packages both from the installer
or from CreateProjectCommand.

@param  string                    $source Source package which made the suggestion
@param  string                    $target Target package to be suggested
@param  string                    $reason Reason the target package to be suggested
@return SuggestedPackagesReporter