export async function findSWAConfigFile()

in src/core/utils/user-config.ts [42:96]
39 lines of code
7 McCabe index (conditional complexity)

export async function findSWAConfigFile(folder: string): Promise<{ filepath: string; content: SWAConfigFile } | null> {
  const configFiles = new Map<string, { filepath: string; isLegacyConfigFile: boolean }>();
  for await (const filepath of traverseFolder(folder)) {
    const filename = path.basename(filepath) as string;

    if (filename === SWA_CONFIG_FILENAME || filename === SWA_CONFIG_FILENAME_LEGACY) {
      const isLegacyConfigFile = filename === SWA_CONFIG_FILENAME_LEGACY;
      configFiles.set(filename, { filepath, isLegacyConfigFile });
    }
  }

  // take staticwebapp.config.json if it exists
  if (configFiles.has(SWA_CONFIG_FILENAME)) {
    const file = configFiles.get(SWA_CONFIG_FILENAME);

    if (file) {
      const config = await loadJSON(file.filepath!);
      if (config) {
        const content = await validateConfigFile(config);
        if (content) {
          const fileSize = (await fs.stat(file.filepath)).size;
          const fileSizeInKb = Math.round(fileSize / 1024);
          if (fileSizeInKb > SWA_RUNTIME_CONFIG_MAX_SIZE_IN_KB) {
            logger.warn(`WARNING: ${SWA_CONFIG_FILENAME} is ${fileSizeInKb} bytes. The maximum size is ${SWA_RUNTIME_CONFIG_MAX_SIZE_IN_KB} bytes.`);
          }

          logger.silly(`Content parsed successfully`);

          logger.log(`\nFound configuration file:\n  ${chalk.green(file.filepath)}\n`);
          return {
            filepath: file.filepath,
            content,
          };
        }
      }
    }

    return null;
  }

  // legacy config file detected. Warn and return null.
  if (configFiles.has(SWA_CONFIG_FILENAME_LEGACY)) {
    const file = configFiles.get(SWA_CONFIG_FILENAME_LEGACY);
    logger.warn(`Found legacy configuration file: ${file?.filepath}.`);
    logger.warn(
      `   WARNING: Functionality defined in the routes.json file is now deprecated. File will be ignored!\n` +
        `   Read more: https://docs.microsoft.com/azure/static-web-apps/configuration#routes`
    );
    return null;
  }

  // no config file found
  logger.silly(`No ${SWA_CONFIG_FILENAME} found in current project`);
  return null;
}