Workflow with Sass compilation, JavaScript concatenation and image optimisation — so many *ation's

Gulpfile.js

/**
 * Terminal shortcut:
 * `npm install --save-dev gulp gulp-imagemin gulp-sass gulp-sourcemaps gulp-concat gulp-uglify gulp-rename`
 */

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

/**
 * Compile scss to css
 */
gulp.task('compile:css', function(){

  // Scan all scss files
  gulp.src('assets/sass/**/*.scss')

    // initalize sourcemaps
    .pipe(sourcemaps.init())

      // compile sass files
      .pipe(sass().on('error', sass.logError))
      
      // apply vendor prefixes
      .pipe(autoprefixer({
            browsers: ['last 2 versions'],
            cascade: false
        }))

    // write sourcemaps
    .pipe(sourcemaps.write())

    // deliver assets
    .pipe(gulp.dest('public/css'));
});

/**
 * Concatinate JavaScript files
 */
gulp.task('concat:js', function(){

  // Scan all js files and attach the main init file to the end of the queue
  gulp.src(['assets/js/**/!(init)*.js', 'assets/js/init.js'])

    // initalize sourcemaps
    .pipe(sourcemaps.init())

      // concat all files into common.js
      .pipe(concat('common.js'))

    // write sourcemaps
    .pipe(sourcemaps.write())

    // deliver assets
    .pipe(gulp.dest('public/js'))

    // uglify current files in stream
    .pipe(uglify())

    .pipe(rename({suffix: '.min'}))

    // deliver assets
    .pipe(gulp.dest('public/js'))
});

/**
 * Optimize images
 */
gulp.task('optimize:images', function(){

  // scan images
  gulp.src('assets/images/**/*')

    // run through an optimizer
    .pipe(imagemin({
        progressive: true,
        svgoPlugins: [{removeViewBox: false}]
    }))

    // deliver images
    .pipe(gulp.dest('public/images'));
});

/**
 * Watch files
 */
gulp.task('watch', ['compile:css', 'concat:js', 'optimize:images'], function(){
  gulp.watch('assets/sass/**/*.scss', ['compile:css']);
  gulp.watch('assets/js/**/*.js', ['concat:js']);
  gulp.watch('assets/images/**/*', ['optimize:images']);
});

/**
 * Build
 */
gulp.task('build', ['compile:css', 'concat:js', 'optimize:images']);

/**
 * Kickouff workflow
 */
gulp.task('default', ['watch']);