auto-destroy.js

const stream = require('stream')

const r = new stream.Readable({
  read () {
    this.push('hello')
    this.push('world')
    this.push(null)
  }
})

r.on('data', data => console.log('r data', data))
r.on('end', () => console.log('r end'))
r.on('close', () => console.log('r close'))

const t = new stream.Transform({
  transform (data, enc, cb) {
    cb(null, data)
  }
})

t.write('hello')
t.write('world')
t.end()

t.on('data', data => console.log('t data', data))
t.on('end', () => console.log('t end'))
t.on('finish', () => console.log('t finish'))
t.on('close', () => console.log('t close'))