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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'questionsStream',
    initial: 'notAnswering',
    context: {
      currentQuestion: ''
    },
    states: {
      notAnswering: { 
        on: {
          ANSWER_NEW_QUESTION: {
            target: 'answering',
            actions: assign({
              currentQuestion: (ctx, event) => event.newQuestion
            })
          },
        }
      },
      answering: {
        on: {
          ANSWER_NEW_QUESTION: {
            target: 'answering',
            actions: assign({
              currentQuestion: (ctx, event) => event.newQuestion
            })
          },
          CLOSE_CURRENT_QUESTION: {
            target: 'notAnswering',
            actions: assign({
              currentQuestion: ''
            })
          }
        }
      }
    }
  });