const releasesTrackerMachine = Machine({
  key: 'releasesTracker',
  initial: 'setup',
  context: {
    releases: null,
    error: null
  },
  states: {
    setup: {
      type: 'parallel',
      states: {
        packageJsonUpload: {
          initial: 'notUploaded',
          states: {
            notUploaded: {
              on: {
                UPLOAD_PACKAGE_JSON: 'uploaded'
              }
            },
            uploaded: {
              type: 'final'
            }
          }
        },
        yarnLockUpload: {
          initial: 'notUploaded',
          states: {
            notUploaded: {
              on: {
                UPLOAD_YARN_LOCK: 'uploaded'
              }
            },
            uploaded: {
              type: 'final'
            }
          }
        }
      },
      onDone: 'releases'
    },
    releases: {
      initial: 'start',
      states: {
        start: {
          on: {
            FETCH_RELEASES: 'fetching'
          }
        },
        fetching: {
          invoke: {
            id: 'fetchReleases',
            src: (context, event) =>
              new Promise((resolve) =>
                resolve({})
              ),
            onDone: {
              target: 'fetched',
              actions: assign({
                releases: (context, event) =>
                  event.data
              })
            },
            onError: {
              target: 'error',
              actions: assign({
                error: (context, event) =>
                  event.data
              })
            }
          },
          on: {
            SUCCESS_FETCHING_RELEASES: 'fetched',
            ERROR_FETCHING_RELEASES: 'error'
          }
        },
        fetched: {},
        error: {}
      }
    }
  }
});