public function install(): OperationResult
    {
        $result = new OperationResult();

        $sourcePath = "{$this->packageInstallDir}/.installer/%s/files";
        foreach ($this->projectType->getProjectDirs() as $projectDir) {
            if (is_dir(sprintf($sourcePath, $projectDir))) {
                /** @var \RecursiveDirectoryIterator $iterator */
                $iterator = new \RecursiveIteratorIterator(
                    new \RecursiveDirectoryIterator(
                        sprintf($sourcePath, $projectDir),
                        \RecursiveDirectoryIterator::SKIP_DOTS
                    ),
                    \RecursiveIteratorIterator::SELF_FIRST
                );

                /** @var \SplFileInfo $file */
                foreach ($iterator as $file) {
                    $target = "{$this->projectRootDir}/{$iterator->getSubPathname()}";
                    if ($file->isDir()) {
                        if (!is_dir($target)) {
                            if (!mkdir($target)) {
                                $result->addErrorMessage("<error>Could not create target directory '${target}'</error>");
                            }
                        }
                    } elseif (!file_exists($target)) {
                        assert(is_string($file->getRealPath()));
                        if (!copy($file->getRealPath(), $target)) {
                            $result->addErrorMessage("<error>Could not copy file to '${target}'</error>");
                        }
                    }
                }
            }
        }

        if (!$result->isFailure()) {
            $result->addStatusMessage("Successfully copied files from package {$this->packageName}");
        }

        return $result;
    }