Create a vue language service extension for typescript

[lucastheisen]

What problem does this feature solve?

Provides types for custom components written as SFC (.vue), imported by other files (like unit tests). Right now, you suggest:

declare module '*.vue' {
    import Vue from 'vue'
    export default typeof Vue
}

But that results in every imported SFC component being of type Vue rather than the component type (which extends Vue). It makes it much more difficult (annoying) to test.

What does the proposed API look like?

It would conform to the recently released (ts version 2.3) language server plugin supporty

[lucastheisen]

Support for .vue files was mentioned in the typescript git repo, but that essentially just said:

I've spoken with Evan (@yyx990803) before. Supporting .vue files would be something that ideally a language service extension would take on (see #10160 for details).

So now, i would like to request that an extension for .vue files gets written.

[ktsn]

There is a language service implementation for vscode by @octref and we currently working for it.
https://github.com/octref/vetur

[yyx990803]

^ we currently don't have plan to implement it as a standalone project, so if you want some IDE-like experience, you'll need to use VSCode + vetur. Maybe @octref will be able to extract the language service into a standalone project in the future?

[octref]

Tracked in vuejs/vetur#168 but not going to happen soon, since the language service is undergoing a major rewrite to have better template IntelliSense (previously dealing with each html/css/js regions using multiple language services separately, now combining them together so vetur can provide even more advanced IntelliSense in template, using info from css/js sections).