zloirock/core-js

requestAnimationFrame polyfill

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#1523 opened on Mar 16, 2026

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enhancementhelp wantedweb standards

Description

Is there plans to support requestAnimationFrame?

The polyfill plans, if planned I propose to be as follows---

  • Ancient webkit and firefox: redirect to mozRAF, webkitRAF (RAF is abbreviated) / mozCAF, webkit CRAF, etc.
  • Older broswers / node: Store a list of callbacks, pump them every 16ms (so all usages of RAF animates at the same time)

Contributor guide

Tech stack
javascript
Domain
frontendperformance
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
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.
mostly clear
Prerequisites
basic JavaScriptunderstanding of requestAnimationFrame
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
The issue proposes a requestAnimationFrame polyfill with a clear implementation plan for ancient WebKit/Firefox and older browsers/Node. However, there is no maintainer response yet. Check the repository's contribution guidelines and any existing discussion in related issues or PRs. Look at core js's existing polyfill patterns (e.g., for other timer functions) to ensure consistency. The file likely to be modified is `modules/web.timers.js` or a new module. Verify if the maintainer is open to adding this polyfill by reviewing comments or asking in the issue.