Ignore unused functions

[rafmos]

Hi,

It would be nice to have an option that is going to ignore functions in imported files that are not used in the entryfile.

Example:

entry-file.scss:

@import "imported-file.scss
$test: my-function1();

imported-file.scss:

@function my-function1() {
  @return (
     color: red;
  );
}

@function my-function2() {
  @return (
     color: blue;
  );
}

The output file should look like this:

@function my-function1() {
  @return (
     color: red;
  );
}

$test: my-function1();

Instead of this:

@function my-function1() {
  @return (
     color: red;
  );
}

@function my-function2() {
  @return (
     color: blue;
  );
}

$test: my-function1();

[MartynasZilinskas]

The initial project feature is bundling all scss source files into one big bundle, so it will be easier to carry around.

So this feature could be implemented in the future, but not anytime soon. Before that, we need to have scss file AST to analyze what was used and what is not.