message: chore(BUILD): fix broken build
  TypeScript seemed to have an issue with XHR all of a sudden, I presume it's some TS update, quick fix any for now to fix the build
diff: @@ -465,13 +465,17 @@ function parseXhrResponse(responseType: string, xhr: XMLHttpRequest) {
  //IE does not support json as responseType, parse it internally
  return xhr.responseType ? xhr.response : JSON.parse(xhr.response || xhr.responseText || 'null');
  } else {
  - return JSON.parse(xhr.responseText || 'null');
  + // HACK(benlesh): TypeScript shennanigans
  + // tslint:disable-next-line:no-any latest TS seems to think xhr is "never" here.
  + return JSON.parse((xhr as any).responseText || 'null');
  }
  case 'xml':
  return xhr.responseXML;
  case 'text':
  default:
  - return ('response' in xhr) ? xhr.response : xhr.responseText;
  + // HACK(benlesh): TypeScript shennanigans
  + // tslint:disable-next-line:no-any latest TS seems to think xhr is "never" here.
  + return ('response' in xhr) ? xhr.response : (xhr as any).responseText;
  }
  }
  