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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const childMachine = Machine({
    id: 'child',
    initial: 'step1',
    states: {
      step1: {
        on: { STEP: 'step2'}
      },
      step2: {
        on: { STEP: 'step3'}
      },
      step3: {
        type: 'final'
      },
    }
  })
  
  const parentMachine = Machine({
    id: 'parent',
    initial: 'idle',
   
    states: {
      idle: {
        on: {
          ACTIVATE: 'active'
        }
      },
      active: {
        invoke: {
          id: 'child',
          src: childMachine,
          onDone: 'done'
        },
        on: {
          STEP: {
            actions: send('STEP', {
              to: 'child'
            })
          }
        }
      },
      done: {}
    }
  });