constructor-of-circuit-breaker.js

...
constructor(http: IHttp, options: ICircuitBreakerOptions) {
  this.http = http;
  this.timeout = options.timeout;
  this.errorHandler = options.errorHandler;

  this.http.instance.interceptors.request.use(this.interceptRequest.bind(this));
  this.http.instance.interceptors.response.use(
    (response: AxiosResponse) => response,
    this.interceptErrorResponse.bind(this),
  );
}
...