getEntryFile example

            $pathname = $path . \DIRECTORY_SEPARATOR . 'Resources/theme.json';

            $basePath = realpath(pathinfo($pathname, \PATHINFO_DIRNAME)) ?: $pathname;

            $basePath = $this->stripProjectDir($basePath);

            $config = new StorefrontPluginConfiguration($name);

            $config->setThemeJson($data);
            $config->setBasePath($this->stripProjectDir($basePath));
            $config->setStorefrontEntryFilepath($this->getEntryFile($path));
            $config->setIsTheme(true);
            $config->setName($data['name']);
            $config->setAuthor($data['author']);

            if (\array_key_exists('style', $data) && \is_array($data['style'])) {
                $this->resolveStyleFiles($data['style'], $basePath, $config);
            }

            if (\array_key_exists('script', $data) && \is_array($data['script'])) {
                $fileCollection = FileCollection::createFromArray($data['script']);
                $config->setScriptFiles($this->addBasePathToCollection($fileCollection, $basePath));
            }

if (mb_strpos($bundle->getPath(), $this->projectDir) === 0) {
                // make relative                 $path = \ltrim(\mb_substr($path, \mb_strlen($this->projectDir)), '/');
            }

            $bundles[$bundle->getName()] = [
                'basePath' => $path . '/',
                'views' => ['Resources/views'],
                'technicalName' => \str_replace('_', '-', $bundle->getContainerPrefix()),
                'administration' => [
                    'path' => 'Resources/app/administration/src',
                    'entryFilePath' => $this->getEntryFile($bundle->getPath(), 'Resources/app/administration/src'),
                    'webpack' => $this->getWebpackConfig($bundle->getPath(), 'Resources/app/administration'),
                ],
                'storefront' => [
                    'path' => 'Resources/app/storefront/src',
                    'entryFilePath' => $this->getEntryFile($bundle->getPath(), 'Resources/app/storefront/src'),
                    'webpack' => $this->getWebpackConfig($bundle->getPath(), 'Resources/app/storefront'),
                    'styleFiles' => $this->getStyleFiles($bundle->getName()),
                ],
            ];
        }