feat(build): system.js bundles replaced with UMD bundles

BREAKIN CHANGES:
- please read sample repo readme.md to update you system.js config
https://github.com/valor-software/angular2-quickstart

Author: valorkin

.config/bundle-system.js

@@ -0,0 +1,88 @@
+#!/usr/bin/env node
+
+'use strict';
+
+/*eslint no-console: 0, no-sync: 0*/
+
+// UMD bundler
+// simple and yet reusable system.js bundler
+// bundles, minifies and gzips
+
+const fs = require('fs');
+const del = require('del');
+const path = require('path');
+const zlib = require('zlib');
+const async = require('async');
+const Builder = require('systemjs-builder');
+
+const pkg = require('../package.json');
+const name = pkg.name;
+const targetFolder = path.resolve('./bundles');
+
+async.waterfall([
+  cleanBundlesFolder,
+  getSystemJsBundleConfig,
+  buildSystemJs({minify: false, sourceMaps: true, mangle: false, noEmitHelpers: false, declaration: true}),
+  getSystemJsBundleConfig,
+  buildSystemJs({minify: true, sourceMaps: true, mangle: false, noEmitHelpers: false, declaration: true})
+], err => {
+  if (err) {
+    throw err;
+  }
+});
+
+function getSystemJsBundleConfig(cb) {
+  const config = {
+    baseURL: '.',
+    transpiler: 'typescript',
+    typescriptOptions: {
+      module: 'cjs'
+    },
+    map: {
+      typescript: './node_modules/typescript/lib/typescript',
+      '@angular': './node_modules/@angular',
+      rxjs: './node_modules/rxjs'
+    },
+    paths: {
+      '*': '*.js'
+    },
+    meta: {
+      './node_modules/@angular/*': {build: false},
+      './node_modules/rxjs/*': {build: false},
+      moment: {build: false}
+    }
+  };
+
+  return cb(null, config);
+}
+
+function cleanBundlesFolder(cb) {
+  return del(targetFolder)
+    .then(paths => {
+      console.log('Deleted files and folders:\n', paths.join('\n'));
+      cb();
+    });
+}
+
+function buildSystemJs(options) {
+  return (config, cb) => {
+    const minPostFix = options && options.minify ? '.umd.min' : '.umd';
+    const fileName = `${name}${minPostFix}.js`;
+    const dest = path.resolve(__dirname, targetFolder, fileName);
+    const builder = new Builder();
+
+    console.log('Bundling system.js file:', fileName, options);
+    builder.config(config);
+
+    return builder
+      .buildStatic(name, dest, {format: 'umd'})
+      .then(() => {
+        console.log('Build complete.');
+        cb();
+      })
+      .catch(err => {
+        console.log('Error', err);
+        cb();
+      });
+  };
+}

.config/umd-bundler.js

@@ -7,7 +7,7 @@
     "flow.docs": "npm run typedoc -- --exclude '**/*.spec.ts' ./components/",
     "flow.compile": "npm run flow.compile:common && npm run flow.compile:system",
     "flow.compile:common": "ngc -p tsconfig.publish.json",
-    "flow.compile:system": "node ./.config/bundle-system.js",
+    "flow.compile:system": "node .config/umd-bundler.js",
     "flow.copy:src": "cpy ng2-bootstrap.ts \"components/*.ts\" ts --parents",
     "flow.clean": "del-cli bundles coverage demo-build \"components/**/*.+(js|d.ts|js.map|metadata.json)\" dist \"ng2-bootstrap.+(js|d.ts|js.map|metadata.json)\" factories",
     "flow.deploy:gh-pages": "npm run flow.build:prod && gh-pages -d demo-build",
@@ -30,7 +30,8 @@
     "version": "npm run flow.changelog && git add -A",
     "postversion": "git push origin development && git push --tags"
   },
-  "main": "ng2-bootstrap.js",
+  "main": "bundles/ng2-bootstrap.js",
+  "module": "ng2-bootstrap.js",
   "typings": "ng2-bootstrap.d.ts",
   "keywords": [
     "angular2",