gulpfile.jsテンプレ
https://github.com/contra/gulp-concat
https://github.com/floridoo/gulp-sourcemaps
https://github.com/floatdrop/gulp-plumber
https://github.com/mikaelbr/gulp-notify
https://github.com/dlmanning/gulp-sass
https://github.com/chilijung/gulp-cssmin
https://github.com/hparra/gulp-rename
https://github.com/terinjokes/gulp-uglify
https://github.com/hustxiaoc/gulp-minify
https://github.com/OverZealous/run-sequence
// プラグイン読み込み
var gulp         = require('gulp');
var concat       = require('gulp-concat');//ファイル結合
var sourcemaps   = require('gulp-sourcemaps');//ソースマップ出力
var plumber      = require('gulp-plumber');//エラーで処理を止めないためのプラグイン
var notify       = require('gulp-notify');//エラー時通知
var sass         = require('gulp-sass');//sass
var cssmin       = require('gulp-cssmin');//css minify
var rename       = require('gulp-rename');//ファイル名変更
var uglify       = require('gulp-uglify');//js minify&難読化
//var minify       = require('gulp-minify');
var runSequence  = require('run-sequence');//処理順序指定用

//js結合
gulp.task('js-concat', function() {
  return gulp.src(['./js.src/_intro.js',
                   './js.src/_variable.js',
                   './js.src/_common.js',
                   './js.src/_model.js',
                   './js.src/_view.article.js',
                   './js.src/_outro.js'])
    .pipe(plumber({
      errorHandler: notify.onError("Error[js-concat]: <%= error.message %>")
    }))
    .pipe(sourcemaps.init())
    .pipe(concat('script.js'))
    .pipe(sourcemaps.write('./'))
    .pipe(gulp.dest('./js'));
});
/*
gulp.task('js-minify',function(){
  return gulp.src(['./js/script.js'])
    .pipe(minify({
      ext:{
        min:'.min.js'
      },
      compress:
    }))
    .pipe(gulp.dest('./js'));
});
*/
//js-concatの後に実行
gulp.task('js-uglify',['js-concat'], function() {
  return gulp.src(['./js/script.js'])
    .pipe(plumber({
      errorHandler: notify.onError("Error[js-uglify]: <%= error.message %>")
    }))
    .pipe(sourcemaps.init())
    .pipe(uglify({
      mangle       :false//変数名を変えない
    }))
    .pipe(rename({suffix:'.min'}))
    .pipe(sourcemaps.write('./'))
    .pipe(gulp.dest('./js'));
});
gulp.task('sass', function(){
  return gulp.src('./css.src/*.scss')
    .pipe(plumber({
      errorHandler: notify.onError("Error[sass]: <%= error.message %>")
    }))
    .pipe(sass({outputStyle: 'expanded'}))
    .pipe(gulp.dest('./css'));
});
//sassの後に実行
gulp.task('cssmin',['sass'], function(){
  return gulp.src(['./css/override.css'])
    .pipe(plumber({
      errorHandler: notify.onError("Error[cssmin]: <%= error.message %>")
    }))
    .pipe(cssmin())
    .pipe(rename({suffix: '.min'}))
    .pipe(gulp.dest('./css'));
});
// ファイルを監視して実行させる
gulp.task('watch',function() {
  return gulp.watch(['js.src/*.js','./css.src/*.scss'],['build']);
});
gulp.task('build', function(callback) {
  runSequence(['js-concat','js-uglify','sass','cssmin'],
              'watch',
              callback);
});
gulp.task('default',['build']);

concat + babel
var gulp = require("gulp");
var babel = require("gulp-babel");
var concat       = require('gulp-concat');
var plumber      = require('gulp-plumber');
var rename       = require('gulp-rename');
var notify       = require('gulp-notify');
var runSequence  = require('run-sequence');
var sourcemaps = require('gulp-sourcemaps');
var dir = './src/';

//結合
gulp.task('file-concat', function() {
    return gulp.src([
        dir + 'parts.intro.es6',
        dir + 'class.A.es6',
        dir + 'class.B.es6',
        dir + 'class.C.es6',
        dir + 'class.D.es6',
        dir + 'class.E.es6',
        dir + 'init.A.es6',
        dir + 'parts.outro.es6'
        ])
        .pipe(plumber({
            errorHandler: notify.onError("Error[js-concat]: <%= error.message %>")
        }))
        .pipe(concat('meter.es6'))
        .pipe(gulp.dest(dir));
});

gulp.task('babel', function() {
    return gulp.src(dir + 'result.es6')
        .pipe(sourcemaps.init())
        .pipe(babel({
            presets: ['es2015-ie']
        }))
        .pipe(sourcemaps.write('./'))
        .pipe(gulp.dest('./'));
});

gulp.task('watch', function() {
    return gulp.watch(dir + '*.es6', ['build']);
});

gulp.task('build', function(callback) {
    return runSequence(
        'file-concat',
        'babel',
        'watch',
        callback);
});

gulp.task('default', ['build']);