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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const machine = Machine({
    id: 'collapsible',
    initial: 'closed',
    states: {
      closed: {
        on: {
          OPEN: {
            target: 'opening',
            actions: 'closedToOpeningAnimation',
          },
        },
      },
      opening: {
        invoke: {
          src: 'openingAnimation',
          onDone: 'opened',
        },
        on: {
          CLOSE: 'closing',
        },
      },
      opened: {
        entry: 'openedAnimation',
        on: {
          CLOSE: {
            target: 'closing',
            actions: 'openedToClosingAnimation',
          },
        },
      },
      closing: {
        invoke: {
          src: 'closingAnimation',
          onDone: 'closed',
        },
        on: {
          OPEN: 'opening',
        },
      },
    },
  }, {
    services: {
      openingAnimation: () => new Promise(resolve => setTimeout(resolve, 2000)),
      closingAnimation: () => new Promise(resolve => setTimeout(resolve, 2000)),
    },
  });