function multipartUpload(_x, _x2) {
    return _multipartUpload.apply(this, arguments);
  }
Upload a file to OSS using multipart uploads
@param {String} name
@param {String|File|Buffer} file
@param {Object} options
       {Object} [options.callback] The callback parameter is composed of a JSON string encoded in Base64
       {String} options.callback.url the OSS sends a callback request to this URL
       {String} [options.callback.host] The host header value for initiating callback requests
       {String} options.callback.body The value of the request body when a callback is initiated
       {String} [options.callback.contentType] The Content-Type of the callback requests initiated
       {Boolean} [options.callback.callbackSNI] Whether OSS sends SNI to the origin address specified by callbackUrl when a callback request is initiated from the client
       {Object} [options.callback.customValue] Custom parameters are a map of key-values, e.g:
                 customValue = {
                   key1: 'value1',
                   key2: 'value2'
                 }