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

machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const collectRecordsMachine = Machine({
    id: 'child',
    initial: 'working',
    context: {
      records: []
    },
    on: {
      ADD_RECORD: [
        {
          cond: c => c.records.length < 3,
          actions: [
            assign({
              records: (c, e) => [...c.records, e.record]
            }),
          ]
        },
        {
          target: 'done'
        }
      ],
    },
    states: {
      working: {},
      done: {
        type: 'final',
        data: {
          records: c => c.records
        }
      }
    }
  });
  
  
  const parentMachine = Machine({
    id: 'parent',
    initial: 'idle',
    states: {
      idle: {
        on: {
          START: 'collectRecords'
        }
      },
      collectRecords: {
        invoke: {
          id: 'child',
          src: collectRecordsMachine,
          onDone: 'success',
          onError: 'idle'
        },
        on: {
          ADD_RECORD: {
            actions: send(
              { 
                type: 'ADD_RECORD', 
                record: Math.random() 
              }, 
              { 
                to: 'child' 
              }
            )
            
          }
        }
      },
      success: {
        entry: (c, e) => console.log('collected records', e.data.records) 
      }
    }
  })