// Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
const asyncState = (src, onDone, onError = 'err') => {
  const err = onError === 'err' ? {
    on: {
      RETRY: 'await'
    }
  } : null;
  
  const state = {
    initial: 'await',
    states: {
      await: {
        invoke: {
          src,
          onDone,
          onError
        }
      }
    }
  }
  
  if (err) {
    state.states.err = err
  }
  
  return state;
}
  
  const CRUDMachine = Machine({
    id: 'crud',
    initial: 'init',
    states: {
      init: {
        on: {
          CREATE: 'asyncCreate'
        }
      },
      
      // CREATE
      asyncCreate: asyncState('create', '#crud.entity'),
      
      entity: {
        on: {
          READ: 'asyncRead',
          UPDATE: 'asyncUpdate',
          DELETE: 'asyncDelete',
        }
      },
      
      // READ
      asyncRead: asyncState('read', '#crud.entity'),
      
      // UPDATE
      asyncUpdate: asyncState('update', '#crud.entity'),
      
      // DELETE
      asyncDelete: asyncState('delete', '#crud.trash'),
      
      
      trash: {
        type: 'final'
      }
    }
  });