[Feature Request] CSS in JS/TS capability

[DavraYoung]

Context

• This issue is not a bug report. (please use a different template for reporting a bug)
• This issue is not a duplicate of an existing issue. (please use the search to find existing issues)

Description

It would be nice, if have css in js capability for typescript and javascript files.

This will allow to edit code for styled-components, emotion css and other.

For example:

css`

display: ${jsVariable.prop};

`

In VS Code there is an extensionthat allows this:

I tried to find all possible ways to do it, but it seems that currently its not possible.

[tamayika]

I read extension implementation and found that its completion is provided by tsserver plugin.
But there is no plugin feature in monaco editor typescript mode.