fix(vscode): syntax highlighting error if type declaration at the end of script block

[zhiyuanzmj]

closed #2060

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commit: 343437b

[johnsoncodehk]

Thanks for the PR, but this is an upstream issue: https://github.com/microsoft/TypeScript-TmLanguage/issues/873

We cannot add this patch fix on our side because we cannot maintain of it's complexity. Most importantly, since this introduces inconsistencies in TS syntax highlights, we cannot verify whether it will cause other regressions.