node/test/parallel/test-stream-transform-callback-twice.js
cjihrig f8c617dbe2 stream: improve multiple callback error message
When a transform stream's callback is called more than once,
an error is emitted with a somewhat confusing message. This
commit hopes to improve the quality of the error message.

Fixes: https://github.com/nodejs/node/issues/12513
PR-URL: https://github.com/nodejs/node/pull/12520
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
2017-05-22 11:54:53 -04:00

15 lines
385 B
JavaScript

'use strict';
const common = require('../common');
const assert = require('assert');
const { Transform } = require('stream');
const stream = new Transform({
transform(chunk, enc, cb) { cb(); cb(); }
});
stream.on('error', common.mustCall((err) => {
assert.strictEqual(err.toString(),
'Error: write callback called multiple times');
}));
stream.write('foo');