Example 4

machine.js

const doTheThingMachine = Machine({
  id: 'do-the-thing',
  initial: 'validating',
  states: {
    validating: {
      invoke: {
        src: 'validateArgs',
        onDone: 'handlingThings',
        onError: {
          target: 'failure',
          actions: 'invalidArgsError'
        }
      }
    },
    handlingThings: {
      type: 'parallel',
      onDone: [
        {target: 'success', cond: 'noErrorsHappened'},
        {target: 'failure', actions: 'performCleanups'},
      ],
      states: {
        thingOne: {
          initial: 'handlingA',
          states: {
            handlingA: {
              invoke: {
                src: 'handleA',
                onDone: {
                  target: 'complete',
                  actions: 'handleASuccess',
                },
                onError: {
                  target: 'complete',
                  actions: 'handleAError',
                },
              },
            },
            complete: {
              type: 'final',
            },
          },
        },
        thingTwo: {
          initial: 'handlingB',
          states: {
            handlingB: {
              invoke: {
                src: 'handleB',
                onDone: {
                  target: 'handlingC',
                  actions: 'handleBSuccess',
                },
                onError: {
                  target: 'complete',
                  actions: 'handleBError',
                },
              },
            },
            handlingC: {
              invoke: {
                src: 'handleC',
                onDone: {
                  target: 'complete',
                  actions: 'handleCSuccess',
                },
                onError: {
                  target: 'complete',
                  actions: ['handleCError', 'cleanupB'],
                },
              },
            },
            complete: {
              type: 'final'
            }
          },
        },
      },
    },
    success: {
      type: 'final',
    },
    failure: {
      type: 'final',
    },
  },
}, 
{
  guards: {
    noErrorsHappened: () => /* check for errors */ true
  }
})