Function downloadFile

src/update/self-update.ts:104–130

(url: string, dest: string, onProgress?: (pct: number) => void)

}

async function downloadFile(url: string, dest: string, onProgress?: (pct: number) => void): Promise<void> {
  const res = await fetch(url, { signal: AbortSignal.timeout(120_000) });
  if (!res.ok) throw new CLIError(`Download failed: ${res.status} ${res.statusText}`, ExitCode.GENERAL);

  const total = Number(res.headers.get('content-length') ?? 0);
  let received = 0;

  const writer = createWriteStream(dest);
  const reader = res.body!.getReader();

  await new Promise<void>((resolve, reject) => {
    writer.on('error', reject);
    const pump = async () => {
      try {
        while (true) {
          const { done, value } = await reader.read();
          if (done) { writer.end(); break; }
          writer.write(value);
          received += value.length;
          if (onProgress && total > 0) onProgress(Math.round(received / total * 100));
        }
        resolve();
      } catch (e) { reject(e); }
    };
    pump();
  });
}

export async function resolveUpdateTarget(channel: Channel): Promise<UpdateTarget> {
  const platform = await detectPlatform();