oven-sh/bun

Async generator function are not properly identified in console.log

Open

#18,324 opened on Mar 20, 2025

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 (2 comments) (0 reactions) (0 assignees)Rust (90,348 stars) (4,486 forks)batch import
bugconsolegood first issue

Description

What version of Bun is running?

1.2.6-canary.74+74768449b

What platform is your computer?

Microsoft Windows NT 10.0.19045.0 x64

What steps can reproduce the bug?

async function* arrayToIter(requests) {
  for (const request of requests) {
    yield await Promise.resolve(request);
  }
}
console.log(arrayToIter([]));

What is the expected behavior?

Node Object [AsyncGenerator] {}

What do you see instead?

Bun {}

Additional information

No response

Contributor guide

Tech stack
javascript
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
async generatorsconsole.log formatting
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
Investigate how Bun's console.log formats objects. Look for where async generator objects are created and ensure they have the correct Symbol.toStringTag set to 'AsyncGenerator'. Check if there is a missing implementation for async generators in the object printing code. Reference similar implementations for other types like regular generators.