Add an interceptor functionality

[kkamkou]

It would be nice to have an option to modify the api (the instance or request) dynamically. The close examples are interceptor or middleware. The closest case is to add a global header for each request without modifying the get method or use the 3rd argument.

ie:

api.interceptors.push((request, next) => {
  request.headers.set('example', 'example');
  next();
});

[wopian]

I think 5.0.0 changed the Axios usage (or somewhere in 2018) to fully expose it - so the following was possible:

const api = new Kitsu()
api.axios.interceptors.response.use(function (response) {
    // Any status code that lie within the range of 2xx cause this function to trigger
    // Do something with response data
    return response;
  }, function (error) {
    // Any status codes that falls outside the range of 2xx cause this function to trigger
    // Do something with response error
    return Promise.reject(error);
  });

PR above will also add it as an alias for it directly on the class (api.interceptors) when its merged.

[wopian]

api.interceptors will be in 7.2.0