Extension example produces build error "Cannot find name 'AbortSignal'." when using the docs in https://code.visualstudio.com/api/get-started/your-first-extension

[ghost]

Does this issue occur when all extensions are disabled?: Yes/No
Yes

• VS Code Version:
  1.6.1.2 (system setup)

• OS Version:
  Windows 10 Enterprise

Steps to Reproduce:

1. Prepare the helloworld extension example, as per the docs. Running it with F5.
2. Edit the extension.ts file in any way
3. Notice the "Problems" tab give the above error
4. This can be fixed by adding "DOM" to the lib:[] compiler option in tsconfig.json

[aeschli]

Caused by the update of @types/node to 14.17.28
DefinitelyTyped/DefinitelyTyped#56388
DefinitelyTyped/DefinitelyTyped@87f7309

Workaround is to use "@types/node": "14.17.27"