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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'check_card',
    initial: 'idle',
    states: {
      idle: {
        on: {
          CHECK: {
            target: "fetching",
            actions: ['send_check']
            
          }
        }
      },
      fetching: {
        on: {
          RESOLVE: "success",
          REJECT: "failure"
        },
        after: {250: "waiting"}
      },
      waiting: {
        on: {
          RESOLVE: "success",
          REJECT: "failure"
        },
        after: {5000: "failure"}
      },
      failure: {
        on: { RETRY: {
          target:"fetching",
          actions: ["send_check"]
        } }
      },
      success: {}
    },
    actions: {
      send_check: (context, event) => {
        console.log("telling the server the card is checked")
      }
    }
  });