code: function (path, body, contentType/*, options*/) {
      return this._getParentId(path).then((parentId) => {
        const fileName = baseName(path);
        const metadata = {
          title: metaTitleFromFileName(fileName),
          mimeType: contentType,
          parents: [{
            kind: "drive#fileLink",
            id: parentId
          }]
        };
        return this._request('POST', BASE_URL + '/upload/drive/v2/files?uploadType=resumable', {
          body: JSON.stringify(metadata),
          headers: {
            'Content-Type': 'application/json; charset=UTF-8'
          }
        }).then((response) => {
          return this._request('POST', response.getResponseHeader('Location'), {
            body: contentType.match(/^application\/json/) ? JSON.stringify(body) : body
          });
        });
      });
    }
docs: Create a new file.
  
  @param {string} path - File path
  @param body - File content
  @param {string} contentType - File content-type
  @returns {Promise} Resolves with the response of the network request
  
  @private