test/parallel/test-stream2-pipe-error-once-listener.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

require('../common');
const stream = require('stream');

class Read extends stream.Readable {
  _read(size) {
    this.push('x');
    this.push(null);
  }
}

class Write extends stream.Writable {
  _write(buffer, encoding, cb) {
    this.emit('error', new Error('boom'));
    this.emit('alldone');
  }
}

const read = new Read();
const write = new Write();

write.once('error', () => {});
write.once('alldone', function(err) {
  console.log('ok');
});

process.on('exit', function(c) {
  console.error('error thrown even with listener');
});

read.pipe(write);