[typescript] dom definitions not up to date

From @yukulele on October 5, 2017 12:7

• VSCode Version: 1.16.1
• OS Version: macOS Sierra 10.12.6

Steps to Reproduce:

• Create this code in typescript file

const elm = document.createElement('main')

• elm is typed as HTMLElement instead of HTMLMainElement

lib.dom.d.ts is not up to date

how to update it without wait for vscode update ?

Reproduces without extensions: Yes

Copied from original issue: Microsoft/vscode#35620