sagas.js

const sendAttachment = function* sendAttachment(action) {
  const sendAttachmentUrl = `http://${BASE_URL}.bamms.co/api/*****/*****/*****/*****`;
  const attachment = require('../images/abc.jpg');

  const data = new FormData();
  data.append('inquiry_id', '265');
  data.append('created_at', '2017-10-05 13:01:22');
  data.append('note', 'halo');
  data.append('attachment', {
    uri: attachment.toString(),
    type: 'image/jpeg',
    name: 'testPhotoName'
  });

  let userAccessToken = '';
  yield AsyncStorage.getItem(ACCESS_TOKEN, (err, result) => {
    userAccessToken = result;
    return userAccessToken;
  });

  if (userAccessToken) {
    try {
      const { response, timeout } = yield race({
        response: fetch(sendAttachmentUrl, {
          method: 'post',
          body: data,
          headers: {
            Authorization: `Bearer ${userAccessToken}`,
            Accept: 'application/json'
          }
        }),
        timeout: delay(60000)
      });

      if (timeout) {
        return yield put({
          type: constants.REQUEST_TIME_OUT_SEND_ATTACHMENT,
          payload: { timeout: 'TIMEOUT' }
        });
      }

      console.log('resposne is', response);
      // if there is a response
      if (response) {
        if (response.data.success) {
          return yield put({
            type: constants.SEND_ATTACHMENT_SUCCESS,
            payload: response
          });
        }
        return yield put({
          type: constants.SEND_ATTACHMENT_FAIL,
          payload: { error: 'send attachment error' }
        });
      }
    } catch (e) {
      console.log(e);
      return yield put({
        type: constants.SEND_ATTACHMENT_FAIL,
        payload: { error: 'send attachment error' }
      });
    }
  }
  return null;
};