Generated by XState Viz: https://xstate.js.org/viz

machine.js

const pongMachine = Machine({
  initial: 'waiting',
  states: {
    waiting: {
      on: {
        PING: {
          actions: sendParent('PONG', { delay: 1000 })
        }
      }
    }
  }
});

const pingMachine = Machine({
  initial: 'active',
  invoke: {
    id: 'pong',
    src: pongMachine
  },
  states: {
    active: {
      entry: send('PING', { to: 'pong' }),
      on: {
        PONG: 'ponged'
      }
    },
    ponged: {
      after: {
        5000: 'active'
      }
    }
  }
})