Microsoft/TypeScript

`ReadonlySet` lacks documentation for `has`, `forEach` and `size`

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#63,481 opened on May 15, 2026

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 (4 comments) (0 reactions) (0 assignees)TypeScript (13,395 forks)batch import
Domain: lib.d.tsHelp WantedPossible Improvement

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Description

⚙ Compilation target

ES2015+

⚙ Library

lib.es2015.collection.d.ts

Missing / Incorrect Definition

ReadonlySet<T> lacks documentation for forEach, has and size.

These should ideally be copied from regular Set<T> for consistency.

Sample Code

https://www.typescriptlang.org/play/?#code/MYewdgzgLgBA5gLhgZQKZQDzQE4EsxwB8MAvDGKgO4roAUA2gEQBMjAugJQDcAUKJLABmSAEqoAhgBNwAGwCeaTDnxFS8XjwD0mmAAkQAN1TYYh4zHFhJMCKlQwoAC3uTcgwcdRhg9gLTwYR3EIGGlgEMpHXBl7QRgZcWAAaxCnVABbHkEAOkEQbABRRMceOFz8ouASnKCIUuzarOyIXAAvVHqW9p4gA

Documentation Link

N/A

Contributor guide

Research direction
Copy the JSDoc documentation from Set<T> to ReadonlySet<T> for the methods has, forEach, and size. Ensure consistency and proper formatting.
Tech stack
typescript
Domain
documentation
Issue type
Documentation
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
1
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
TypeScriptGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
90