pipeline-minify-js/src/index.js

Gulp pipeline to minify and optionally concatenate js files

'use strict';

var concat = require('gulp-concat');
var gulpIf = require('gulp-if');
var handyman = require('pipeline-handyman');
var lazypipe = require('lazypipe');
var sourcemaps = require('gulp-sourcemaps');
var uglify = require('gulp-uglify');
var rename = require('gulp-rename');

var config = {
  addSourceMaps: true,
  concat: true,
  concatFilename: handyman.getPackageName() + '.min.js',
  concatOutput: '.',
  plugins: {
    uglify: {}
  }
};

module.exports = {
  minifyJS: function(options) {
    if (options) {
      handyman.log('Minifying with custom options');
      config = handyman.mergeConfig(config, options);
    }
    return pipelineFactory();
  }
};

function pipelineFactory() {
  var stream = lazypipe()
    .pipe(function () {
      return gulpIf(config.addSourceMaps, sourcemaps.init());
    })
    .pipe(uglify, config.plugins.uglify)
    .pipe(function () {
      return gulpIf(!config.concat, rename({extname: '.min.js'}));
    })
    .pipe(function () {
      return gulpIf(config.concat, concat(config.concatFilename));
    })
    .pipe(function () {
      return gulpIf(config.addSourceMaps, sourcemaps.write(config.concatOutput));
    });

  return stream();
}