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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
const guards = {
  isInitialized: (context, { data }) => {
    return false;
  },
};

  
const purchaseDefinition = {
  initial: 'IDLE',
  context: {
    error: {},
  },
  states: {
    IDLE: {
      on: {
        PURCHASE: {
          target: 'VALIDATING',
        },
      },
    },
    // @TODO: some states might conditionally send to error or idle based on the
    // type of error that occurs
    ERROR: {
      type: 'final',
    },
    VALIDATING: {
      invoke: {
        src: 'validate', // recaptcha, not owned by current user, etc.
        onDone: 'CHECK_INITIALIZATION',
        onError: 'ERROR',
      },
    },
    CHECK_INITIALIZATION: {
      invoke: {
        src: 'checkPurchaseInitialization',
        onDone: [
          {
            cond: 'isInitialized',
            target: 'FINAL_CHECKS',
          },
          {
            target: 'INITIALIZING',
          },
        ],
        onError: 'IDLE',
      },
    },
    INITIALIZING: {
      invoke: {
        src: 'initialize', // is NFT still for sale, etc.
        onDone: 'PURCHASING',
        onError: 'IDLE',
      },
    },
    FINAL_CHECKS: {
      invoke: {
        src: 'runFinalChecks', // is NFT still for sale, etc.
        onDone: 'PURCHASING',
        onError: 'IDLE',
      },
    },
    PURCHASING: {
      invoke: {
        src: 'purchaseNFT', // recaptcha, not owned by current user, etc.
        onDone: 'TAIL_TX',
        onError: 'IDLE',
      },
    },
    TAIL_TX: {
      invoke: {
        src: 'tailPurchase',
        onDone: 'POLL_API',
        onError: 'IDLE',
      },
    },
    POLL_API: {
      invoke: {
        src: 'getUserNFT',
        onDone: 'SUCCESS',
        onError: 'IDLE',
      },
    },
    SUCCESS: {
      type: 'final',
    },
  },
};

  
  
Machine(purchaseDefinition, { guards });