gulpfile.js

'use strict';

var gulp = require('gulp');
var less = require('gulp-less');
var sourcemaps = require('gulp-sourcemaps');
var uglify = require('gulp-uglify');

var LessAutoprefix = require('less-plugin-autoprefix');
var autoprefix = new LessAutoprefix({ browsers: ['last 2 versions'] });

gulp.task('less', function(done) {
  gulp.src('./source/css/microb.less')
    .pipe(sourcemaps.init())
    .pipe(less({
      plugins: [autoprefix]
     }))
    .on('error', console.error.bind(console))
    .pipe(sourcemaps.write('.'))
    .pipe(gulp.dest('./source/css'));
    done();
});

gulp.task('scripts', function(done) {
  var files = [
    './source/js/microb.js',
  ];

  gulp.src(files)
    .pipe(uglify())
    .pipe(gulp.dest('./source/js'));
  done();
});

gulp.task('default', gulp.series('less'));
gulp.watch('./source/css/*.less', gulp.series('less'));