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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: {
      // 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