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var gulp = require('gulp');
var sass = require('gulp-sass');
var sourcemaps = require('gulp-sourcemaps');
var autoprefixer = require('gulp-autoprefixer');

// ... variables
var autoprefixerOptions = {
  browsers: ['last 2 versions', '> 5%', 'Firefox ESR']
};

gulp.task('sass', function () {
  return gulp
    .src(input)
    .pipe(sourcemaps.init())
    .pipe(sass(sassOptions).on('error', sass.logError))
    .pipe(sourcemaps.write())
    .pipe(autoprefixer(autoprefixerOptions))
    .pipe(gulp.dest(output));
});