Function downloadFile

cli/src/utils/github-downloader.ts:87–153

* Downloads a file from URL with redirect support

(
  urlString: string,
  destPath: string,
  spinner: ora.Ora | null
)

 * Downloads a file from URL with redirect support
 */
function downloadFile(
  urlString: string,
  destPath: string,
  spinner: ora.Ora | null
): Promise<void> {
  return new Promise((resolve, reject) => {
    const file = fs.createWriteStream(destPath);
    const url = new URL(urlString);
    const client = url.protocol === "https:" ? https : http;

    const request = client.get(url, (response) => {
      const statusCode = response.statusCode || 0;

      // Handle redirects
      if (REDIRECT_CODES.includes(statusCode)) {
        cleanup(file, response, request, destPath);
        const location = response.headers.location;
        if (!location) {
          if (spinner) spinner.fail("Redirect location not found");
          return reject(new Error("Redirect location not found"));
        }
        const redirectUrl = location.startsWith("http")
          ? location
          : new URL(location, url).toString();
        return downloadFile(redirectUrl, destPath, spinner)
          .then(resolve)
          .catch(reject);
      }

      // Handle errors
      if (statusCode === 404) {
        cleanup(file, response, request, destPath);
        if (spinner) spinner.fail("Branch not found");
        return reject(new Error("Branch not found in repository"));
      }

      if (statusCode !== 200) {
        cleanup(file, response, request, destPath);
        if (spinner) spinner.fail("Failed to download from GitHub");
        return reject(
          new Error(
            `Failed to download from GitHub: ${statusCode} ${response.statusMessage}`
          )
        );
      }

      // Success - pipe to file
      response.pipe(file);
      file.on("finish", () => {
        file.close();
        if (spinner) spinner.text = "Extracting components...";
        resolve();
      });
      file.on("error", (err) => {
        cleanup(null, response, request, destPath);
        if (spinner) spinner.fail("Download failed");
        reject(err);
      });