SessionStore.js

import { observable } from 'mobx';
import { withStateTransition, stateTransition } from './StateTransition';

@withStateTransition
export class SessionStore {
  constructor() {}

  @observable accessToken = null;
  @observable user = null;

  @stateTransition('loading', 'idle')
  async logInByAccessToken(accessToken) {
    await this._setAccessToken(accessToken);
    await this._fetchUser();
  }

  @stateTransition('loading', 'idle')
  async logInWithFacebookAccessToken(facebookAccessToken) {
    const response = await axios.get(SMUGL_API_FACEBOOK_TOKEN_CALLBACK, {
      params: {
        access_token: facebookAccessToken
      }
    });

    await this._setAccessToken(response.data.content.token);
    await this._fetchUser();
  }

  // ...
}