diff --git a/src/dev-app/system-config.js b/src/dev-app/system-config.js
index b63c346991c8..bedd8d6ac85c 100644
--- a/src/dev-app/system-config.js
+++ b/src/dev-app/system-config.js
@@ -6,7 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-const CDK_PACKAGES = [
+// Note that this file isn't being transpiled so we need to keep it in ES5.
+
+var CDK_PACKAGES = [
   'a11y',
   'accordion',
   'bidi',
@@ -26,13 +28,13 @@ const CDK_PACKAGES = [
   'tree',
 ];
 
-const CDK_EXPERIMENTAL_PACKAGES = [
+var CDK_EXPERIMENTAL_PACKAGES = [
   'dialog',
   'popover-edit',
   'scrolling',
 ];
 
-const MATERIAL_PACKAGES = [
+var MATERIAL_PACKAGES = [
   'autocomplete',  'badge',
   'bottom-sheet',  'button',
   'button-toggle', 'card',
@@ -53,11 +55,11 @@ const MATERIAL_PACKAGES = [
   'tree',
 ];
 
-const GOOGLE_MAPS_PACKAGES = [
+var GOOGLE_MAPS_PACKAGES = [
   'google-map',
 ];
 
-const MATERIAL_EXPERIMENTAL_PACKAGES = [
+var MATERIAL_EXPERIMENTAL_PACKAGES = [
   'mdc-button',
   'mdc-card',
   'mdc-checkbox',
@@ -71,13 +73,13 @@ const MATERIAL_EXPERIMENTAL_PACKAGES = [
 ];
 
 /** Bazel runfile path referring to the "src/" folder of the project. */
-const srcRunfilePath = 'angular_material/src';
+var srcRunfilePath = 'angular_material/src';
 
 /** Path mappings that will be registered in SystemJS. */
-const pathMapping = {};
+var pathMapping = {};
 
 /** Package configurations that will be used in SystemJS. */
-const packagesConfig = {};
+var packagesConfig = {};
 
 // Configure all primary entry-points.
 configureEntryPoint('cdk');
@@ -88,88 +90,97 @@ configureEntryPoint('material-examples');
 configureEntryPoint('material-moment-adapter');
 
 // Configure all secondary entry-points.
-CDK_PACKAGES.forEach(pkgName => configureEntryPoint('cdk', pkgName));
-CDK_EXPERIMENTAL_PACKAGES.forEach(pkgName => configureEntryPoint('cdk-experimental', pkgName));
-MATERIAL_EXPERIMENTAL_PACKAGES.forEach(
-    pkgName => configureEntryPoint('material-experimental', pkgName));
-MATERIAL_PACKAGES.forEach(pkgName => configureEntryPoint('material', pkgName));
-GOOGLE_MAPS_PACKAGES.forEach(pkgName => configureEntryPoint('google-maps', pkgName));
+CDK_PACKAGES.forEach(function(pkgName) {
+  configureEntryPoint('cdk', pkgName);
+});
+CDK_EXPERIMENTAL_PACKAGES.forEach(function(pkgName) {
+  configureEntryPoint('cdk-experimental', pkgName);
+});
+MATERIAL_EXPERIMENTAL_PACKAGES.forEach(function(pkgName) {
+  configureEntryPoint('material-experimental', pkgName);
+});
+MATERIAL_PACKAGES.forEach(function(pkgName) {
+  configureEntryPoint('material', pkgName);
+});
+GOOGLE_MAPS_PACKAGES.forEach(function(pkgName) {
+  configureEntryPoint('google-maps', pkgName);
+});
 
 /** Configures the specified package and its entry-point. */
 function configureEntryPoint(pkgName, entryPoint) {
   if (entryPoint === undefined) {
-    pathMapping[`@angular/${pkgName}`] = `${srcRunfilePath}/${pkgName}`;
-    packagesConfig[`${srcRunfilePath}/${pkgName}`] = {main: 'index.js'};
+    pathMapping['@angular/' + pkgName] = srcRunfilePath + '/' + pkgName;
+    packagesConfig[srcRunfilePath + '/' + pkgName] = {main: 'index.js'};
   } else {
-    pathMapping[`@angular/${pkgName}/${entryPoint}`] = `${srcRunfilePath}/${pkgName}/${entryPoint}`;
-    packagesConfig[`${srcRunfilePath}/${pkgName}/${entryPoint}`] = {main: 'index.js'};
+    pathMapping['@angular/' + pkgName + '/' + entryPoint] =
+        srcRunfilePath + '/' + pkgName + '/' + entryPoint;
+    packagesConfig[srcRunfilePath + '/' + pkgName + '/' + entryPoint] = {main: 'index.js'};
   }
 }
 
+var map = Object.assign({
+  'main': 'main.js',
+  'tslib': 'tslib/tslib.js',
+  'moment': 'moment/min/moment-with-locales.min.js',
+
+  'rxjs': 'rxjs/bundles/rxjs.umd.min.js',
+  'rxjs/operators': 'system-rxjs-operators.js',
+
+  // MDC Web
+  '@material/animation': '@material/animation/dist/mdc.animation.js',
+  '@material/auto-init': '@material/auto-init/dist/mdc.autoInit.js',
+  '@material/base': '@material/base/dist/mdc.base.js',
+  '@material/checkbox': '@material/checkbox/dist/mdc.checkbox.js',
+  '@material/chips': '@material/chips/dist/mdc.chips.js',
+  '@material/dialog': '@material/dialog/dist/mdc.dialog.js',
+  '@material/dom': '@material/dom/dist/mdc.dom.js',
+  '@material/drawer': '@material/drawer/dist/mdc.drawer.js',
+  '@material/floating-label': '@material/floating-label/dist/mdc.floatingLabel.js',
+  '@material/form-field': '@material/form-field/dist/mdc.formField.js',
+  '@material/grid-list': '@material/grid-list/dist/mdc.gridList.js',
+  '@material/icon-button': '@material/icon-button/dist/mdc.iconButton.js',
+  '@material/line-ripple': '@material/line-ripple/dist/mdc.lineRipple.js',
+  '@material/linear-progress': '@material/linear-progress/dist/mdc.linearProgress.js',
+  '@material/list': '@material/list/dist/mdc.list.js',
+  '@material/menu': '@material/menu/dist/mdc.menu.js',
+  '@material/menu-surface': '@material/menu-surface/dist/mdc.menuSurface.js',
+  '@material/notched-outline': '@material/notched-outline/dist/mdc.notchedOutline.js',
+  '@material/radio': '@material/radio/dist/mdc.radio.js',
+  '@material/ripple': '@material/ripple/dist/mdc.ripple.js',
+  '@material/select': '@material/select/dist/mdc.select.js',
+  '@material/slider': '@material/slider/dist/mdc.slider.js',
+  '@material/snackbar': '@material/snackbar/dist/mdc.snackbar.js',
+  '@material/switch': '@material/switch/dist/mdc.switch.js',
+  '@material/tab': '@material/tab/dist/mdc.tab.js',
+  '@material/tab-bar': '@material/tab-bar/dist/mdc.tabBar.js',
+  '@material/tab-indicator': '@material/tab-indicator/dist/mdc.tabIndicator.js',
+  '@material/tab-scroller': '@material/tab-scroller/dist/mdc.tabScroller.js',
+  '@material/text-field': '@material/textfield/dist/mdc.textfield.js',
+  '@material/top-app-bar': '@material/top-app-bar/dist/mdc.topAppBar.js'
+}, pathMapping);
+
+var packages = Object.assign({
+  // Set the default extension for the root package, because otherwise the dev-app can't
+  // be built within the production mode. Due to missing file extensions.
+  '.': {defaultExtension: 'js'},
+
+  // Angular specific mappings.
+  '@angular/core': {main: 'bundles/core.umd.js'},
+  '@angular/common': {main: 'bundles/common.umd.js'},
+  '@angular/common/http': {main: '../bundles/common-http.umd.js'},
+  '@angular/compiler': {main: 'bundles/compiler.umd.js'},
+  '@angular/forms': {main: 'bundles/forms.umd.js'},
+  '@angular/animations': {main: 'bundles/animations.umd.js'},
+  '@angular/elements': {main: 'bundles/elements.umd.js'},
+  '@angular/router': {main: 'bundles/router.umd.js'},
+  '@angular/animations/browser': {main: '../bundles/animations-browser.umd.js'},
+  '@angular/platform-browser/animations': {main: '../bundles/platform-browser-animations.umd'},
+  '@angular/platform-browser': {main: 'bundles/platform-browser.umd.js'},
+  '@angular/platform-browser-dynamic': {main: 'bundles/platform-browser-dynamic.umd.js'},
+}, packagesConfig);
+
 // Configure the base path and map the different node packages.
 System.config({
-  map: {
-    'main': 'main.js',
-    'tslib': 'tslib/tslib.js',
-    'moment': 'moment/min/moment-with-locales.min.js',
-
-    'rxjs': 'rxjs/bundles/rxjs.umd.min.js',
-    'rxjs/operators': 'system-rxjs-operators.js',
-
-    // MDC Web
-    '@material/animation': '@material/animation/dist/mdc.animation.js',
-    '@material/auto-init': '@material/auto-init/dist/mdc.autoInit.js',
-    '@material/base': '@material/base/dist/mdc.base.js',
-    '@material/checkbox': '@material/checkbox/dist/mdc.checkbox.js',
-    '@material/chips': '@material/chips/dist/mdc.chips.js',
-    '@material/dialog': '@material/dialog/dist/mdc.dialog.js',
-    '@material/dom': '@material/dom/dist/mdc.dom.js',
-    '@material/drawer': '@material/drawer/dist/mdc.drawer.js',
-    '@material/floating-label': '@material/floating-label/dist/mdc.floatingLabel.js',
-    '@material/form-field': '@material/form-field/dist/mdc.formField.js',
-    '@material/grid-list': '@material/grid-list/dist/mdc.gridList.js',
-    '@material/icon-button': '@material/icon-button/dist/mdc.iconButton.js',
-    '@material/line-ripple': '@material/line-ripple/dist/mdc.lineRipple.js',
-    '@material/linear-progress': '@material/linear-progress/dist/mdc.linearProgress.js',
-    '@material/list': '@material/list/dist/mdc.list.js',
-    '@material/menu': '@material/menu/dist/mdc.menu.js',
-    '@material/menu-surface': '@material/menu-surface/dist/mdc.menuSurface.js',
-    '@material/notched-outline': '@material/notched-outline/dist/mdc.notchedOutline.js',
-    '@material/radio': '@material/radio/dist/mdc.radio.js',
-    '@material/ripple': '@material/ripple/dist/mdc.ripple.js',
-    '@material/select': '@material/select/dist/mdc.select.js',
-    '@material/slider': '@material/slider/dist/mdc.slider.js',
-    '@material/snackbar': '@material/snackbar/dist/mdc.snackbar.js',
-    '@material/switch': '@material/switch/dist/mdc.switch.js',
-    '@material/tab': '@material/tab/dist/mdc.tab.js',
-    '@material/tab-bar': '@material/tab-bar/dist/mdc.tabBar.js',
-    '@material/tab-indicator': '@material/tab-indicator/dist/mdc.tabIndicator.js',
-    '@material/tab-scroller': '@material/tab-scroller/dist/mdc.tabScroller.js',
-    '@material/text-field': '@material/textfield/dist/mdc.textfield.js',
-    '@material/top-app-bar': '@material/top-app-bar/dist/mdc.topAppBar.js',
-
-    ...pathMapping,
-  },
-  packages: {
-    // Set the default extension for the root package, because otherwise the dev-app can't
-    // be built within the production mode. Due to missing file extensions.
-    '.': {defaultExtension: 'js'},
-
-    // Angular specific mappings.
-    '@angular/core': {main: 'bundles/core.umd.js'},
-    '@angular/common': {main: 'bundles/common.umd.js'},
-    '@angular/common/http': {main: '../bundles/common-http.umd.js'},
-    '@angular/compiler': {main: 'bundles/compiler.umd.js'},
-    '@angular/forms': {main: 'bundles/forms.umd.js'},
-    '@angular/animations': {main: 'bundles/animations.umd.js'},
-    '@angular/elements': {main: 'bundles/elements.umd.js'},
-    '@angular/router': {main: 'bundles/router.umd.js'},
-    '@angular/animations/browser': {main: '../bundles/animations-browser.umd.js'},
-    '@angular/platform-browser/animations': {main: '../bundles/platform-browser-animations.umd'},
-    '@angular/platform-browser': {main: 'bundles/platform-browser.umd.js'},
-    '@angular/platform-browser-dynamic': {main: 'bundles/platform-browser-dynamic.umd.js'},
-
-    // Project specific configurations.
-    ...packagesConfig,
-  }
+  map: map,
+  packages: packages
 });