In writable stream, should we always set state.errorEmitted to true when executing stream.emit('error')? #18181
Description
I have read the source code of lib/_stream_writable.js. I have a doubt about the meaning of state.errorEmitted.
Why do we set state.errorEmitted to true in some situations of stream.emit('error'), but doesn't set it in other situations. Moreover, it doesn't achieve emitting 'error' event only one time. For example, as shown below, the code will emit 'error' event two times :
const { Writable } = require('stream');
w = new Writable();
w.on('error', error => {
console.log('on error.', error);
});
w.write(null);
w.write(null);