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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  // add, compound, harvest, exit
  // are all things to calculate on evaluation loops, they're not so much "state"
    
  const poolMachine = {
    id: 'pool',
    initial: 'unknown',
    states: {
      unknown: {
        on: {
          ELIGIBLE: 'eligible',
          ARCHIVE: 'archived',
          INSPECT: 'inspect'
        }
      },
      eligible: {
        on: {
          ARCHIVE: 'archived'
        }
      },
      inspect: {
        on: {
          REVISIT: 'unknown'
        }
      },
      archived: {
        on: {
          REVISIT: 'unknown'
        }
      }
    }
  }
  
  const farmMachine = Machine({
    id: 'farm',
    initial: 'unknown',
    context: {
      retries: 0
    },
    states: {
      unknown: {
        on: {
          CAN_READ: 'readable',
          CANT_READ: 'inspect'
        }
      },
      readable: {
        on: {
          CAN_FARM: 'farmable',
          CANT_FARM: 'inspect'
        }
      },
      farmable: {
        on: {
          DUSTBOWL: 'archived'
        },
        ...poolMachine
      },
      inspect: {
        on: {
          FIXED: 'unknown',
          WONTFIX: 'archived'
        }
      },
      archived: {
        on: {
          REVISIT: 'unknown'
        }
      },
    }
  });