In Node.js, is there a way to return the zip stream to the frontend early, instead of waiting for the entire zip file to be processed before returning it to the frontend, to avoid long waits for zip export responses?

[WormGirl]

const zipFile = path.join(folder, `${fileName}.zip`);
          const zipWriter = new ZipWriter(
            Writable.toWeb(fs.createWriteStream(zipFile)),
            {
              password: filePwd,
              encryptionStrength: 3
            }
          );
          await zipWriter.add(`${fileName}.${type}`, Readable.toWeb(stream));
          await zipWriter.close();
          stream = fs.createReadStream(zipFile);
          ctx.body = stream;

[gildas-lormeau]

You can remove the await keywords or make sure they are not blocking the execution (by calling ctx.waitUntil), like in the example below for CloudFlare (see #513 for more info):

export default {
  async fetch(request, env, ctx) {
    // ...
    const zipFile = path.join(folder, `${fileName}.zip`);
    const zipWriter = new ZipWriter(Writable.toWeb(fs.createWriteStream(zipFile)),{
      password: filePwd,
      encryptionStrength: 3
    });

    ctx.waitUntil(
      (async () => {
        // ...
        await zipWriter.add(`${fileName}.${type}` Readable.toWeb(stream));
        await zipWriter.close();
      })()
    );

    return new Response(readable, {
      headers: {
        "Content-Disposition": 'attachment; filename="file.zip"',
        "Content-Type": "application/zip",
        "Cache-Control": "no-cache",
      },
    });
  },
};