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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'fetch',
    initial: 'idle',
    context: {
      retries: 0
    },
    states: {
      idle: {
        on: {
          EVT_UPDATE_NOTIFICATION: 'get_notification_from_db'
        }
      },
      get_notification_from_db: {
        on: {
          OK_SOME_DB_RECORD: 'ok_some_db_record',
          OK_NONE_DB_RECORD: 'weak_success',
          ERROR_DB_RECORD: 'db_failure'          
        }
      },
      weak_success: {
        type: 'final'
      },
      success: {
        type: 'final'
      },
      ok_some_db_record: {
        on: {
          "UNSEEN_TO_READ": "update_record",
          "UNREAD_TO_READ": "update_record",
          "UNSEEN_TO_UNREAD": "update_record",
          "OTHER": "invalid_update_msg"
        }
      },
      update_record: {
        on: {
          OK_DB_WRITE: 'success',
          ERROR_DB_WRITE: 'db_failure'
        }
      },
      invalid_update_msg: {
        type: "final"
      },
      db_failure: {
        on: {
          RETRY: {
            target: 'get_notification_from_db',
            actions: assign({
              retries: (context, event) => context.retries + 1
            })
          }
        }
      }
    }
  });