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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const sessionStart = Machine({
    id: 'sessionStart',
    initial: 'run',
    
    states: {
      run: {
        entry: ['log'],
        type: 'final'
      }
    }
  }, {
    actions: {
      log(context, event){
        console.log('log', context, event)
      }
    }
  });
  
  const sessionManager = Machine({
    
    id: 'sessionManager',
    type: 'parallel',
    initial: 'idle',
    
    context: {
      sessions: []
    },
    
    states: {
      idle: {
        on: {
          START: {
            target: 'start',
            actions: ['addSession']
          }
        }
      },
      
      start: {
        invoke: {
          id: 'sessionStart',
          onDone: 'save',
          onError: 'error'
        }
      },
      
      save: {
        invoke: {
          id: 'sessionSave',
          onDone: 'idle',
          onError: 'error'
        }
      },
      
      error: {
        invoke: {
          id: 'sessionError',
          onDone: 'idle'
        }
      }
    }
    
  }, {
    actions: {
      addSession(context, event) {
        console.log('addSession', context, event)
        context.sessions.push(event.session)
      }
    },
    services: {
      sessionStart
    }
  });