How to properly import css from node_modules using sass or less?

Question

Sass

I decided to style the grid according to the instructions.
https://github.com/swimlane/ngx-datatable/blob/mas...
Installed grid via npm.
Installed gulp.
Created scss, added to it

@import '[email protected]/ngx-datatable/release/index.css';
@import '[email protected]/ngx-datatable/release/themes/material.css';
@import '[email protected]/ngx-datatable/release/assets/icons.css';

But in the output css file I get

@import url([email protected]/ngx-datatable/release/index.css);
@import url([email protected]/ngx-datatable/release/themes/material.css);
@import url([email protected]/ngx-datatable/release/assets/icons.css);

With Less, the situation is about the same (
The rest of the sass or less rules are interpreted normally.
Please, tell me how to import correctly?

Answer 1

Everything turned out through sass

@import '../node_modules/@swimlane/ngx-datatable/release/index';
@import '../node_modules/@swimlane/ngx-datatable/release/themes/material';
@import '../node_modules/@swimlane/ngx-datatable/release/assets/icons';

Only the fonts folder had to be copied by hand, I'm not sure if this is good.