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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'botscript',
    initial: 'digest',
    context: {
      retries: 0
    },
    states: {
      digest: {
        on: {
          DIALOG: 'dialogue',
          FLOW: 'flow',
          DEFECT: 'nomatch'
        }
      },
      dialogue: {
        on: {
          FLOW: 'flow',
          RESOLVE: 'output',
        }
      },
      flow: {
        on: {
          NEXT: 'flow',
          RESOLVE: 'dialogue',
          //REPLY: 'output' (cannot go straight to output, must resolve and back to the dialogue)
        }
      },
      nomatch: {
        on: {
          RETRY: {
            target: 'digest',
            actions: assign({
              retries: (context, event) => context.retries + 1
            })
          },
          RESOLVE: 'output'
        }
      },
      command: {
        on: {
          RESOLVE: 'output'
        }
      },
      populate: {
        on: {
          RESOLVE: 'output'
        }
      },
      output: {
        on: {
          POPULATE: 'populate',
          COMMAND: 'command',
          REPLY: 'response',
        }
      },
      response: {
        type: 'final'
      }
    }
  });