return relative paths in result.map.sources - not absolute file:// URL

[milahu]

dart-sass always returns absolute file URLs like file:///absolute/path/to/src/input.css
in the sources array of result.map
also when i enter relative filepaths like src/input.css

is there a way to get relative file paths in result.map.sources?

im looking for the equivalent of options.source_map_file_urls in libsass

// libsass/src/source_map.cpp

if (ctx.c_options.source_map_file_urls) {
  source = File::rel2abs(source);
  // check for windows abs path
  if (source[0] == '/') {
    // ends up with three slashes
    source = "file://" + source;
  } else {
    // needs an additional slash
    source = "file:///" + source;
  }
}

but i had no luck grepping through dart-sass sources

related to sass/node-sass#3057

[Awjin]

This is a limitation inherent to the way that the JS API currently handles file paths. We're actively redesigning the API to allow for the use case that you describe here.