TypeScript 7 VS Code extension: a workspace "typescript" 7.x package is not detected, only "@typescript/native-preview", which is no longer published

[leonidaz]

The TypeScript 7 extension finds a workspace's own TypeScript 7 only in node_modules/@typescript/native-preview. That package was last published on 2026-07-07 (7.0.0-dev.20260707.2). TypeScript 7 now ships as typescript: typescript@7.0.2 came out the next day, and the 7.1 nightlies ship as typescript@next (7.1.0-dev.20260930.4 today). So a project that installs TypeScript 7 the current way runs the extension's bundled compiler instead of its own. Nothing tells the user, and the only fix is to write a tsdk setting by hand.

Versions: TypeScript 7 extension 1.0.1, VS Code 1.140.0, macOS.

Repro

1. In an empty folder, run npm install -D typescript@next and add main.ts with export const n: number = 1;.
2. Open the folder in VS Code with the TypeScript 7 extension installed, and open main.ts. No setting is needed: on its first start, the extension turns TypeScript 7 on by itself (it writes "js/ts.experimental.useTsgo": true into the user settings). If TypeScript 7 was turned off later, run TypeScript: Enable TypeScript 7 Language Server.

Expected: the extension offers the workspace's TypeScript, as it does for @typescript/native-preview: the "This workspace has TypeScript 7 installed" prompt, and Use Workspace Version in TypeScript: Select TypeScript Version.

Actual: no prompt, and the server runs the extension's own compiler (7.0.2), not node_modules/typescript (7.1):

…/extensions/typescriptteam.native-preview-1.0.1-darwin-x64/lib/tsc --lsp --stdio

With "js/ts.tsdk.path": "node_modules/typescript", the same project runs the workspace compiler. So only the detection is missing: resolveTsdkPathToExe already accepts a typescript package (bin tsc).

Where

In packages/vscode-typescript/src/session.ts (main at 43521c8), findWorkspaceNativePreviewPackages checks only node_modules/@typescript/native-preview. Both promptUseWorkspaceVersion and the version picker (promptSelectVersion) use it.

Suggestion

Also detect node_modules/typescript when it is TypeScript 7 or newer. pathHasTsserverJs already tells a TypeScript 5 or 6 package apart from a TypeScript 7 one.

Why it matters

• The editor and the project's tsc (CLI, CI) then run the same compiler.
• Features that need a 7.1 nightly, such as content mappers with --runExternalCode, now need either the TypeScript 7 Nightly extension or a hand-written tsdk setting. The Nightly extension applies to every workspace and changes daily. The tsdk setting is easy to miss, because the extension never mentions it.