Is it possible to edit vuejs\'s *.vue component files in Visual Studio 2017 with highlighting and intellisense support for HTML, TypeScript AND SCSS?
At the moment,
Currently the answer is no. The HTML editor is aware of some languages that can be hosted, such as CSS, JavaScript, and Razor (ASP.NET). In these cases, the editor does some fancy things to map sections of the text to each language service. However, TypeScript and SCSS do not support that at the moment, and as far as I know it's not on the backlog for either team.
Please request this using the VS Feedback tool. Since vuejs support this, it bears some weight and may get taken into account for future feature planning. A customer report can sometimes carry more weight than mine.
(Full Disclosure: I work on the team that owns the HTML and SCSS editors in VS. We don't own TypeScript, but we work with the team for things like this.)