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44 changes: 44 additions & 0 deletions test/known_issues/test-stream-writable-sync-error.js
Original file line number Diff line number Diff line change
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'use strict';
const common = require('../common');

// Tests for the regression in _stream_writable discussed in
// https://github.com/nodejs/node/pull/31756

// Specifically, when a write callback is invoked synchronously
// with an error, and autoDestroy is not being used, the error
// should still be emitted on nextTick.

const { Writable } = require('stream');

class MyStream extends Writable {
#cb = undefined;

constructor() {
super({ autoDestroy: false });
}

_write(_, __, cb) {
this.#cb = cb;
}

close() {
// Synchronously invoke the callback with an error.
this.#cb(new Error('foo'));
}
}

const stream = new MyStream();

const mustError = common.mustCall(2);

stream.write('test', () => {});

// Both error callbacks should be invoked.

stream.on('error', mustError);

stream.close();

// Without the fix in #31756, the error handler
// added after the call to close will not be invoked.
stream.on('error', mustError);