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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
// const pingMachine = Machine({
//   id: 'ping',
//   initial: 'active',
//   states: {
//     active: {
//       invoke: {
//         id: 'pong',
//         src: pongMachine
//       }
//       // Sends 'PING' event to child machine with ID 'pong'
//       entry: send('PING', { to: 'pong' }),
//       on: {
//         PONG: {
//           actions: send('PING', {
//             to: 'pong',
//             delay: 1000
//           })
//         }
//       }
//     }
//   }
// });

// Invoked child machine
const pongMachine = Machine({
  id: 'pong',
  initial: 'active',
  states: {
    active: {
      on: {
        PING: {
          // Sends 'PONG' event to parent machine
          actions: sendParent('PONG', {
            delay: 1000
          })
        }
      }
    }
  }
});