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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'pomodoro',
    initial: 'idle',
    context: {
      pomodoros: 0,
      rounds: 0,
      extra: 0
    },
    states: {
      idle: {
        on: {
          START: 'working'
        }
      },
      working: {
        entry: ['pomodoroComplete'],
        on: {
          TAKE_SHORT_BREAK: {
            target: 'shortBreak',
            cond: 'notTimeForLongBreak'
          },
          TAKE_LONG_BREAK: {
            target: 'longBreak',
            cond: 'timeForLongBreak'
          },
          KEEP_GOING: {
            target: 'working',
            actions: ['doingExtraWork']
          }
        }
      },
      shortBreak: {
        on: {
          TIMER: 'working',
        }
      },
      longBreak: {
        exit: ['startOver'],
        on: {
          TIMER: 'working'
        }
      }
    }
  }, {
    actions: {
      pomodoroComplete: assign({
              pomodoros: (context, event) => context.pomodoros + 1
            }),
      startOver: assign({
        pomodoros: 0,
        rounds: (context, event) => context.rounds + 1
      }),
      doingExtraWork: assign({
        extra: (context, event) => context.extra + 1
      })
    },
    guards: {
      timeForLongBreak: (context, event) => {
        return context.pomodoros > 3;
      },
      notTimeForLongBreak: (context, event) => {
        return context.pomodoros < 4;
      }
    }
  });