garrytan/gstack · error

Unknown write command: ${command}

Error message

Unknown write command: ${command}

What it means

Error "Unknown write command: ${command}" thrown in garrytan/gstack.

Source

Thrown at browse/src/write-commands.ts:1425

    case 'archive': {
      const page = bm.getPage();
      const outputPath = args[0] || path.join(TEMP_DIR, `browse-archive-${Date.now()}.mhtml`);
      validateOutputPath(outputPath);

      try {
        const data = await withCdpSession(page, async (cdp) => {
          const result = await cdp.send('Page.captureSnapshot', { format: 'mhtml' });
          return (result as { data: string }).data;
        });
        fs.writeFileSync(outputPath, data);
        return `Archive saved: ${outputPath} (${Math.round(data.length / 1024)}KB, MHTML)`;
      } catch (err: any) {
        throw new Error(`MHTML archive requires Chromium CDP. Use 'text' or 'html' for raw page content. (${err.message})`);
      }
    }

    default:
      throw new Error(`Unknown write command: ${command}`);
  }
}

/** Map MIME type to file extension. */
function mimeToExt(mime: string): string {
  const map: Record<string, string> = {
    'image/png': '.png', 'image/jpeg': '.jpg', 'image/gif': '.gif',
    'image/webp': '.webp', 'image/svg+xml': '.svg', 'image/avif': '.avif',
    'video/mp4': '.mp4', 'video/webm': '.webm', 'video/quicktime': '.mov',
    'audio/mpeg': '.mp3', 'audio/wav': '.wav', 'audio/ogg': '.ogg',
    'application/pdf': '.pdf', 'application/json': '.json',
    'text/html': '.html', 'text/plain': '.txt',
  };
  return map[mime] || '.bin';
}

View on GitHub (pinned to 94993f7401)

When it happens

Trigger: Thrown at browse/src/write-commands.ts:1425 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of garrytan/gstack@94993f7401 (2026-08-12). Data as JSON: /api/errors/f444df0d95c901a4. Report an issue: GitHub.