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events: update and clarify error message #10387

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events: update and clarify error message #10387

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4 changes: 2 additions & 2 deletions lib/events.js
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Original file line number Diff line number Diff line change
Expand Up @@ -177,7 +177,7 @@ EventEmitter.prototype.emit = function emit(type) {
er = arguments[1];
if (domain) {
if (!er)
er = new Error('Uncaught, unspecified "error" event');
er = new Error('Unhandled "error" event');
if (typeof er === 'object' && er !== null) {
er.domainEmitter = this;
er.domain = domain;
Expand All @@ -188,7 +188,7 @@ EventEmitter.prototype.emit = function emit(type) {
throw er; // Unhandled 'error' event
} else {
// At least give some kind of context to the user
var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
const err = new Error('Unhandled "error" event. (' + er + ')');
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I'm not sure it's a good idea to remove the last part. I understand that if you emit a plain object, it will print [object Object] but it seems logical for the "error" event to emit an Error and in this case it would print the error message correctly.

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I agree.

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yea, I would prefer that we keep the er in the message

err.context = er;
throw err;
}
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8 changes: 6 additions & 2 deletions test/parallel/test-event-emitter-errors.js
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Expand Up @@ -5,6 +5,10 @@ const assert = require('assert');

const EE = new EventEmitter();

assert.throws(function() {
assert.throws(() => {
EE.emit('error', 'Accepts a string');
}, /Accepts a string/);
}, /^Error: Unhandled "error" event\. \(Accepts a string\)$/);

assert.throws(() => {
EE.emit('error', {message: 'Error!'});
}, /^Error: Unhandled "error" event\. \(\[object Object\]\)$/);