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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  const step1 = {
    checkConditions: ()=>raise('CONDITIONS_PASSED')
  }
  
  const testMachine = Machine({
    id: 'test',
    initial: 'ready',
    context: {
      stepNumber: 0,
      steps: [step1,'step2']
    },
    states: {
      ready: {
        on: {
          STATE_CHANGE: 'checkingConditions'
        }
      },
      checkingConditions: {
        entry: (context, event)=>context.steps[context.stepNumber].checkConditions(),
        on: {
          CONDITIONS_PASSED: 'doStep',
          CONDITIONS_FAILED: 'ready'
        }
      },
      doStep: {
        on: {
          FINISHED: [{
            target: 'ready',
            actions: assign({
              stepNumber: (context, event)=> context.stepNumber+1
            }),
            cond: (context, event)=> 
              (context.stepNumber+1) <= context.steps.length
          }, {
            target: 'success',
          }],
          FAILED: 'failure'
        }
      },
      success: {
        type: 'final'
      },
      failure: {
        type: 'final'
      }
    }
  });