Can I make sourcemaps work after concatenation + minification?

'use strict';

var gulp   = require('gulp'),
    concat = require('gulp-concat'),
    uglify = require('gulp-uglify'),
    rename = require('gulp-rename'),
    sass   = require('gulp-sass'),
    maps   = require('gulp-sourcemaps');

gulp.task('concatScripts', function() {
  return gulp.src([
    'js/jquery.js',
    'js/sticky/jquery.sticky.js',
    'js/main.js'])
  .pipe(maps.init())
  .pipe(concat('app.js'))
  .pipe(maps.write('./'))
  .pipe(gulp.dest('js'));
});

gulp.task('minifyScripts', ['concatScripts'], function() {
  return gulp.src('js/app.js')
  .pipe(maps.init())
  .pipe(uglify())
  .pipe(rename('app.min.js'))
  .pipe(maps.write('./'))
  .pipe(gulp.dest('js'));
});

gulp.task('compileSass', function() {
  return gulp.src('scss/application.scss')
  .pipe(maps.init())
  .pipe(sass())
  .pipe(maps.write('./'))
  .pipe(gulp.dest('css'));
});

gulp.task('default', ['concatScripts', 'minifyScripts', 'compileSass'], function() {
  console.log("This is the default task!");
});