message: Made a _transport type.
diff: @@ -98,6 +98,7 @@ export class Connection extends JSForceConnection {
  // the jsForce connection.tooling.logger and connection.logger.
  private logger: Logger;
  private _logger: Logger;
  + private _transport: { httpRequest: (info: RequestInfo) => JsonMap };
  private authInfo: AuthInfo;
  @@ -141,7 +142,7 @@ export class Connection extends JSForceConnection {
  * @returns {Promise<JsonMap>} The request Promise.
  */
  public async requestRaw(request: RequestInfo): Promise<JsonMap> {
  - return this['_transport'].httpRequest({
  + return this._transport.httpRequest({
  method: request.method,
  url: request.url,
  headers: request.headers,
  