Fix `CompletionItem.command` deprecation for built-in js/ts

Description

Contributor guide

Tech stack

typescriptjavascript

Domain

developer experience

Issue type

bug

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.

blocked

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

mostly clear

Prerequisites

Understanding of VSCode extension APITypeScript basics

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

25

Research direction

Investigate the deprecation of `CompletionItem.command` during resolve. Look at the completion provider code for built in JavaScript/TypeScript in VSCode. The changes likely involve updating the resolve method to set command before creation rather than during resolve. Refer to issue #237857 for context.