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machine.js

const turnMachine = Machine({
  id: 'turn',
  initial: 'beginning',
  states: {
    beginning: {
      initial: 'untap',
      states: {
        untap: {
          entry: sendParent({type: 'UNTAP_STEP_START'}),
          exit: sendParent({type: 'UNTAP_STEP_END'}),
          on: {
            'ADVANCE_STEP': {target: 'upkeep'}
          }
        },
        upkeep: {
          entry: sendParent({type: 'UPKEEP_STEP_START'}),
          exit: sendParent({type: 'UPKEEP_STEP_END'}),
          on: {
            'ADVANCE_STEP': {target: 'draw'}
          }
        },
        draw: {
          entry: sendParent({type: 'DRAW_STEP_START'}),
          exit: sendParent({type: 'DRAW_STEP_END'}),
          on: {
            'ADVANCE_STEP': {target: '#turn.main'}
          }
        },
      }
    },
    main: {
      initial: 'firstMain',
      states: {
        firstMain: {
          entry: sendParent({type: 'FIRST_MAIN_STEP_START'}),
          exit: sendParent({type: 'FIRST_MAIN_STEP_END'}),
          on: {
            'ADVANCE_STEP': {target: 'attackStep'}
          }
        },
        attackStep: {
          inital: 'makeChoice',
          entry: sendParent({type: 'ATTACK_STEP_START'}),
          exit: sendParent({type: 'ATTACK_STEP_END'}),
          states: {
            makeChoice: {
              on: {
                'ATTACK': {target: 'attack'},
                'SKIP_ATTACK': {target: '#turn.main.secondMain'}
              }
            },
            attack: {
              initial: 'chooseAttackers',
              states: {
                chooseAttackers: {
                  entry: sendParent({type: 'CHOOSE_ATTACKERS_STEP_START'}),
                  exit: sendParent({type: 'CHOOSE_ATTACKERS_STEP_END'}),
                  on: {
                    'ADVANCE_STEP': {target: 'chooseBlockers'}
                  }
                },
                chooseBlockers: {
                  entry: sendParent({type: 'CHOOSE_BLOCKERS_STEP_START'}),
                  exit: sendParent({type: 'CHOOSE_BLOCKERS_STEP_END'}),
                  on: {
                    'ADVANCE_STEP': {target: 'resolveDamage'}
                  }
                },
                resolveDamage: {
                  entry: sendParent({type: 'RESOLVE_DAMAGE_STEP_START'}),
                  exit: sendParent({type: 'RESOLVE_DAMAGE_STEP_END'}),
                  on: {
                    'ADVANCE_STEP': {target: '#turn.main.secondMain'}
                  }
                }
              }
            }
          },
        },
        secondMain: {
          entry: sendParent({type: 'SECOND_MAIN_STEP_START'}),
          exit: sendParent({type: 'SECOND_MAIN_STEP_END'}),
          on: {
            'ADVANCE_STEP': {target: '#turn.end'}
          }
        }
      }
    },
    end: {
      type: 'final',
      entry: sendParent({type: 'END_STEP_START'}),
      exit: sendParent({type: 'END_STEP_END'}),
    }
  }
})