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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const maxTime = 5000
  
  const randomSleep = () => {
    return new Promise((resolve, reject) => {
      const success = maxTime * Math.random()
      const failure = maxTime * Math.random() + 100
      setTimeout(resolve, success)
      setTimeout(reject, failure)
    })
  }
  
  const fetchMachine = Machine({
    id: 'fetch',
    initial: 'loading',
    context: {
      retries: 0
    },
    states: {
      loading: {
        invoke: {
          id: 'getResults',
          src: randomSleep,
          onDone: 'success',
          onError: 'failure'
        },
        after: {
          [maxTime]: 'failure'
        }
      },
      success: {
        type: 'final'
      },
      failure: {
        type: 'final'
      }
    }
  });