gulp\tasks\dist.js

'use strict';

var gulp = require('gulp');
var webpack = require('gulp-webpack');

gulp.task('dist', function () {
  return gulp.src('src/[LIBRARY ENTRY POINT (i.e. backbone.freeze.js)]')
    .pipe(webpack({
      output: {
        filename: '[NAME OF FINAL FILE (i.e. backbone.freeze.js)]',
        libraryTarget: 'umd'
      },
      externals: {
        backbone: {
        amd: 'backbone',
        commonjs: 'backbone',
        commonjs2: 'backbone',
        root: 'Backbone'
      },
      underscore: {
        amd: 'underscore',
        commonjs: 'underscore',
        commonjs2: 'underscore',
        root: '_'
      },
      devtool: 'source-map'
    }
  }))
  .pipe(gulp.dest('dist'));
});