code: function compileSass(path, ext, file, callback) {
    let compiledCss = sass.renderSync({
      file: path,
      outputStyle: 'compressed',
    });
    callback(null, compiledCss.css);
  }
docs: Compile SASS to CSS.
  @see https://github.com/ludohenin/gulp-inline-ng2-template
  @see https://github.com/sass/node-sass