mozilla/rhino

Support ES2021 WeakRef & FinalizationRegistry

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#943 opened on Jun 23, 2021

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 (2 comments) (0 reactions) (0 assignees)JavaScript (3,728 stars) (812 forks)batch import
Ecma Incompatibilityfeaturegood first issue

Description

WeakRef, for referring to a target object without preserving it from garbage collection FinalizationRegistry, to manage registration and unregistration of cleanup operations performed when target objects are garbage collected

Proposal: https://github.com/tc39/proposal-weakrefs MDN: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakRef

Contributor guide

Tech stack
javascriptjava
Domain
backendapi
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Understanding of JavaScript WeakRef and FinalizationRegistryFamiliarity with Rhino's garbage collectionJava development experience
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15
Research direction
Study the TC39 WeakRef proposal (https://github.com/tc39/proposal weakrefs) and MDN documentation. Review how other JavaScript engines implement these features, especially in Rhino's context. Look at Rhino's source code for existing built in objects and garbage collection mechanisms. Check if there are any prior attempts or related discussions in the issue tracker. Implement WeakRef and FinalizationRegistry classes in Java, integrating with Rhino's engine.