Sass intellisense for @extend using @import

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SASS

VS2015

i am using VS 2015 enterprise on a mvc6 .net core project. When i @import a partial i expect to get intellisense for all the classes in the @import file but i don't. I get intellisense for all other things i import like variables and mixins. Also it does compile and work fine but no intellisense. If i use less it gives me intellisense but sass does not. I need to use sass for this project. Here is example

_SassStylesheet.scss
.btn {color: red;}

then i import the file into another stylesheet

@import "_SassStylesheet.scss"
.btn2 {@extend .btn}

There is no intellisense for .btn

I dont think this is an @extend issue as if i just type . after the @import statement i don't get any css classes imported from that stylsheet. Here's Example

@import "_SassStylesheet.scss"
. 

no intellisense as it should show me all the classes from imported stylesheet but does not.

I think this may be a vs 2015 issue or web compiler. Not sure as i have tried not using those and setting up grunt-postcss and grunt sass. I am new to front end tooling. This seems like a simple solution it would be as intellsiense works for @include which is for mixins. Also even if i dont use @extend and just type dot i still don't get intellisense for classes in that stylesheet.

What I have tried:

web compiler, postcss, grunt sass. soo many other things i cant remember