POC. Gulp tasks as modules.

build-styles.js

const path = require('path');

const gulp = require('gulp');
const sourcemaps = require('gulp-sourcemaps');
const sass = require('gulp-sass');
const postcss = require('gulp-postcss');
const autoprefixer = require('autoprefixer-core');

module.exports = function(opts) {
  return function() {
    return gulp.src(opts.src)
      .pipe(sourcemaps.init())
      .pipe(sass().on('error', sass.logError))
      .pipe(postcss([
        autoprefixer({ browsers: ['last 2 version'] })
      ]))
      .pipe(sourcemaps.write('.'))
      .pipe(gulp.dest(opts.dest))
  }
};

scaffold-task.js

const gulp = require('gulp');
const buildStyles = require('./build-styles');

gulp.task('styles', buildStyles({
	src: 'source/styles/*.scss',
	dest: 'dest/assets'
}));