Function fetchData

lib/index-browser.js:7169–7200

(filename)

      // which we cannot parse. Also, this is more efficient than
      // receiving attachments as base64-encoded strings.
      async function fetchData(filename) {
        const att = atts[filename];
        const path = encodeDocId(doc._id) + '/' + encodeAttachmentId(filename) +
            '?rev=' + doc._rev;

        const response = await ourFetch(genDBUrl(host, path));

        let blob;
        if ('buffer' in response) {
          blob = await response.buffer();
        } else {
          /* istanbul ignore next */
          blob = await response.blob();
        }

        let data;
        if (opts.binary) {
          const typeFieldDescriptor = Object.getOwnPropertyDescriptor(blob.__proto__, 'type');
          if (!typeFieldDescriptor || typeFieldDescriptor.set) {
            blob.type = att.content_type;
          }
          data = blob;
        } else {
          data = await new Promise(function (resolve) {
            blobToBase64(blob, resolve);
          });
        }

        delete att.stub;
        delete att.length;
        att.data = data;
      }

      const promiseFactories = filenames.map(function (filename) {
        return function () {