How to use SASS in Dart editor

I stumbled upon this a few days ago

Sass integration for pub

Here is a build.dart file with basic support for SASS:

import 'dart:io';void main(List<String> args) {  for (String arg in args) {    if (arg.startsWith('--changed=')) {      String file = arg.substring('--changed='.length);      if (file.endsWith('.scss')) {        var result = Process.runSync('sass',            [ '--line-numbers', file,              file.substring(0, file.length - '.scss'.length) + '.css']);        if (result.exitCode != 0) {          // report error (SASS seems to only report first error)          // split error lines          var lines = result.stderr.split('\n');          // escape quotes in error message on first line          var error = lines[0].replaceAll('"', r'\"');          // extract line number from second line          var numMatch = new RegExp(r'\d+').firstMatch(lines[1]);          var lineNum = numMatch == null ? 1 : num.parse(numMatch.group(0));          // Report error via JSON          print('[{"method":"error","params":{"file":"$file","line":$lineNum,"message":"$error"}}]');        }      }    }  }}

During development (with Dart Editor or another editor...), just use sass the way it's meant to be used, in your directory project :

sass -w .

Put the CSS generated files in the ignore list of your source code management system (aka .gitignore for git).

And for dart2js compilation, use the sass pub package : http://pub.dartlang.org/packages/sass