Unhandled rejections and other awaited promise tales

on YouTube ↗20m

" summary

Concrete claims and actions matter: Node Core adds a runtime flag that turns unhandled rejections into exceptions, V8 and Node 12 expose async stack traces (zero-cost) so the origin of awaited errors is visible, and several core APIs gain native promise variants (file system, DNS, events) instead of ad hoc wrappers. The talk demonstrates async/await refactors, explains why unhandled promise accumulation keeps processes running, and shows that the flag and native APIs actually land and make error handling and observability work better.

AI-written summary · about

" chapters (8)

1. 0:00Rejections and promises
2. 2:52Promises as language feature
3. 8:13Async/await implications
4. 11:20Unhandled rejections in Node.js
5. 14:09Proper rejection handling
6. 16:36Async stack traces in Chrome
7. 17:17Node.js native promises
8. 18:44Future improvements

" related talks

• 57mError handling: doing it right!Ruben Bridgewater · HolyJS Piter 2019
• 28mError handling: doing it right!Ruben Bridgewater · JSNation 2019
• 20mPromises API in Node.js Core: Part "Do", the Update!Joe Sepi · Node+JS Interactive 2019
• 14mThe Promised Path to Async, AwaitsMichael Robinson · Decompress AU 2016
• 32mError handling: doing it right!Ruben Bridgewater · JSCamp Barcelona 2019
• 24mFinding Broken Promises in Asynchronous JavaScript ProgramsSaba Alimadadi · OOPSLA 2018
• 23mHolding on to Your Performance PromisesBenedikt Meurer, Maya Lekova · NodeConf EU 2018
• 21mPromises API in Node.js core: where we are and where we’ll get toJoe Sepi · JSConf EU 2019