src/Composer/Installer/LibraryInstaller.php
public function getInstallPath(PackageInterface $package)
    {
        $this->initializeVendorDir();

        $basePath = ($this->vendorDir ? $this->vendorDir.'/' : '') . $package->getPrettyName();
        $targetDir = $package->getTargetDir();

        return $basePath . ($targetDir ? '/'.$targetDir : '');
    }
public function getInstallPath(PackageInterface $package)
    {
        $this->initializeVendorDir();

        $basePath = ($this->vendorDir ? $this->vendorDir.'/' : '') . $package->getPrettyName();
        $targetDir = $package->getTargetDir();

        return $basePath . ($targetDir ? '/'.$targetDir : '');
    }
{@inheritDoc}