使い方
- インストールコマンドをコピーし、自分の環境へ導入する前にソースを確認します。
- 必要なツール、認証情報、対応環境を原文で確認します。
- 入力と成果物を指定し、出力を資料と照合します。
npx skills add https://github.com/nexu-io/open-design --skill export-download-debugging開始前の確認
- 導入にはモデル契約、API枠、ファイルへのアクセス許可は含まれません。
- スター数や導入数は活動の指標であり、独立した品質・安全性試験ではありません。
見出し、例、コード、表、リンク、参照画像を含む原文を表示しています。
Export Download Debugging
Use this when an export or download appears to run but produces an empty, missing, or unusable file. It is tuned for browser previews, iframe capture, and Electron shells.
Core rule
Separate capture from save. Prove the export payload has non-zero bytes before debugging the destination path. A 0 KB file often means the native picker or host created the target file, then the write failed or was blocked.
Evidence
- Record the payload type, MIME type, byte length, object URL or data URL path,
and thrown error name/message.
- Check browser console output and app logs around
showSaveFilePicker,
createWritable, <a download>, URL.createObjectURL, and URL revocation.
- In Electron, inspect the
will-downloadpath: filename, MIME, file extension,
save dialog filters, cancellation, and final file size.
- Confirm the actual downloaded file size on disk and whether it opens in a
normal image viewer.
Fix order
- Prepare and validate the export payload first; disable Save until bytes are
available.
- Prefer the simplest stable save channel for the host. If
showSaveFilePicker().createWritable() fails, is sandboxed, or creates empty files, route to <a download> or Electron's download manager instead.
- Avoid opening a native picker before the payload is ready. This prevents the
host from creating an empty destination file on later write failure.
- For PNG fallback, prefer a verified non-empty data URL when blob URLs,
revocation timing, CSP, or iframe sandboxing are suspicious.
- In Electron, add explicit Save As filters for exported image extensions
(.png, .jpg, .jpeg, .webp) so users can choose a real image target.
- Keep the UI restrained: format selection, filename/path hint, clear pending
and error states, and one primary save action.
Validation
- Add or update tests for non-empty payload preparation, fallback save behavior,
file extension/MIME mapping, and UI disabled/error states.
- Run focused export tests, then
pnpm --filter @open-design/web typecheck. - If Electron download handling changed, also run
pnpm --filter @open-design/desktop typecheck.
- Before landing, run
pnpm guard, inspect the staged diff for unrelated files,
generated artifacts, and accidental secrets, then use the repository's PR quality-gate workflow if the fix is being prepared for review.
