Sass lint

.sass-lint.yml

options:
  formatter: stylish
files:
  include: '**/*.s+(a|c)ss'
#  ignore:
rules:
  # Extends
  extends-before-mixins: 1
  extends-before-declarations: 1
  placeholder-in-extend: 1

  # Mixins
  mixins-before-declarations: 1

  # Line Spacing
  one-declaration-per-line: 1
  empty-line-between-blocks: 0
  single-line-per-selector: 0

  # Disallows
  no-color-keywords: 0
  no-color-literals: 0
  no-css-comments: 1
  no-debug: 1
  no-duplicate-properties: 1
  no-empty-rulesets: 1
  no-extends: 0
  no-ids: 0
  no-important: 0
  no-invalid-hex: 1
  no-mergeable-selectors: 1
  no-misspelled-properties: 1
  no-qualifying-elements: 0
  no-trailing-zero: 1
  no-transition-all: 1
  no-url-protocols: 1
  no-vendor-prefixes: 1
  no-warn: 0

  # Nesting
  force-attribute-nesting: 0
  force-element-nesting: 0
  force-pseudo-nesting: 0

  # Name Formats
  function-name-format: 1
  mixin-name-format: 1
  placeholder-name-format: 1
  variable-name-format: 1

  # Style Guide
  border-zero: 1
  brace-style: 1
  clean-import-paths: 0
  empty-args: 1
  hex-length: 1
  hex-notation: 1
  indentation: 1
  leading-zero: 0
  nesting-depth: 1
  property-sort-order: 1
  quotes: 1
  shorthand-values: 0
  url-quotes: 1
  variable-for-property: 1
  zero-unit: 1

  # Inner Spacing
  space-after-comma: 1
  space-before-colon: 1
  space-after-colon: 1
  space-before-brace: 1
  space-before-bang: 1
  space-after-bang: 1
  space-between-parens: 1

  # Final Items
  trailing-semicolon: 1
  final-newline: 1

gulpfile.js

// Sass task
//------------------------------------------------------------------------------

gulp.task('sass', ['sass-lint'], function() {
  var onError = function(err) {
    notify.onError({
      title: "Gulp",
      subtitle: "Failure!",
      message: "Error: <%= error.message %>",
      sound: "Beep"
    })(err);
    this.emit('end');
  };
  gulp.src('css/**/*.scss')
    .pipe(plumber({ errorHandler: onError }))
    .pipe(sourcemaps.init())
    .pipe(sass({ outputStyle: 'expanded' }).on('error', sass.logError))
    .pipe(autoprefixer('last 2 versions', '> 1%', 'ie 9'))
    .pipe(sourcemaps.write('./'))
    .pipe(gulp.dest('../css'))
    .pipe(browsersync.stream({ match: '**/*.css' }));
});


// Sass Lint task
//------------------------------------------------------------------------------

gulp.task('sass-lint', function() {
  return gulp.src('css/**/*.scss')
    .pipe(sasslint())
    .pipe(sasslint.format())
    .pipe(sasslint.failOnError())
});