Microsoft/TypeScript

Missing Intl.Locale.prototype.getWeekInfo()

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#61,713 opened on May 16, 2025

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BugDomain: lib.d.tsHelp Wanted

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Description

⚙ Compilation target

esnext

⚙ Library

ESNext

Missing / Incorrect Definition

Intl.Locale.prototype.getWeekInfo() of the Intl Locale Info API is missing.

The method is available in multiple major browsers as well as in Node.js since v18.

Sample Code

const enUS = new Intl.Locale("en-US");
console.log(enUS.getWeekInfo());

Documentation Link

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/getWeekInfo

Contributor guide

Research direction
Look at the existing Intl.Locale type definitions in TypeScript's lib files (e.g., lib.esnext.intl.d.ts) and add the getWeekInfo() method with proper return type based on MDN documentation.
Tech stack
typescript
Domain
internationalizationapi
Issue type
Feature
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
TypeScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70