// Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'timer',
    initial: 'stopped',
    context: {
      duration: 0,
      endDate: null
    },
    states: {
      stopped: {
        on: {
          START: {
            cond: (_, event) => event.endDate,
            target: 'running',
            actions: assign({
              duration: (context, event) => 
                new Date(event.endDate) - (new Date()),
              endDate: (context, event) => 
                new Date(event.endDate),
            })
          }
        }
      },
      running: {
        on: {
          TICK: [
            {
              cond: (context) => 
                context.endDate <= (new Date()),
              target: 'stopped'
            },
            {
              actions: assign({
                duration: (context, event) => 
                  context.endDate - (new Date())
              })
            }
          ],
          PAUSE: 'paused'
        }
      },
      paused: {
        on: {
          START: 'running',
          STOP: {
            target: 'stopped',
            actions: assign({
              duration: 0
            })
          }
        }
      }
    }
  });