Missing Intl.Locale.prototype.getWeekInfo()

Description

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

Contributor guide

Tech stack

typescriptjavascript

Domain

apitooling

Issue type

feature

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

TypeScript type declaration syntaxContribution guidelines for microsoft/TypeScriptFamiliarity with Intl.Locale API

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

80

Research direction

This issue asks to add the missing `Intl.Locale.prototype.getWeekInfo()` method to TypeScript's built in type definitions. The method is specified in the TC39 proposal and documented on MDN. The file to modify is likely `lib.esnext.d.ts` in the TypeScript source, where other `Intl.Locale` methods are defined. Review the existing `Intl.Locale` type definitions for patterns. The issue has three comments; check if any additional context or guidance is provided there. The implementation should follow the spec exactly, returning an object with `firstDay`, `weekend`, `minDays` properties.