diff --git a/bin/packages/get-babel-config.js b/bin/packages/get-babel-config.js
index cdbce9b51a58ad..e79bc306d07c4c 100644
--- a/bin/packages/get-babel-config.js
+++ b/bin/packages/get-babel-config.js
@@ -35,17 +35,11 @@ const babelConfigs = {
 		{},
 		babelDefaultConfig,
 		{
-			plugins: map(
-				plugins,
-				( plugin ) => overrideOptions( plugin, '@babel/plugin-transform-runtime', {
-					corejs: false,
-				} )
-			),
+			plugins,
 			presets: map(
 				babelDefaultConfig.presets,
 				( preset ) => overrideOptions( preset, '@babel/preset-env', {
 					modules: 'commonjs',
-					useBuiltIns: false,
 				} )
 			),
 		}
@@ -57,7 +51,6 @@ const babelConfigs = {
 			plugins: map(
 				plugins,
 				( plugin ) => overrideOptions( plugin, '@babel/plugin-transform-runtime', {
-					corejs: false,
 					useESModules: true,
 				} )
 			),
@@ -65,7 +58,6 @@ const babelConfigs = {
 				babelDefaultConfig.presets,
 				( preset ) => overrideOptions( preset, '@babel/preset-env', {
 					modules: false,
-					useBuiltIns: false,
 				} )
 			),
 		}
diff --git a/lib/client-assets.php b/lib/client-assets.php
index e00c39586cc733..446a7c68409f6d 100644
--- a/lib/client-assets.php
+++ b/lib/client-assets.php
@@ -102,63 +102,63 @@ function gutenberg_register_scripts_and_styles() {
 	wp_register_script(
 		'wp-url',
 		gutenberg_url( 'build/url/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/url/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-autop',
 		gutenberg_url( 'build/autop/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/autop/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-wordcount',
 		gutenberg_url( 'build/wordcount/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/wordcount/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-dom-ready',
 		gutenberg_url( 'build/dom-ready/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/dom-ready/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-a11y',
 		gutenberg_url( 'build/a11y/index.js' ),
-		array( 'wp-dom-ready' ),
+		array( 'wp-dom-ready', 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/a11y/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-hooks',
 		gutenberg_url( 'build/hooks/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/hooks/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-i18n',
 		gutenberg_url( 'build/i18n/index.js' ),
-		array( 'wp-deprecated' ),
+		array( 'wp-deprecated', 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/i18n/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-is-shallow-equal',
 		gutenberg_url( 'build/is-shallow-equal/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/is-shallow-equal/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-token-list',
 		gutenberg_url( 'build/token-list/index.js' ),
-		array( 'lodash' ),
+		array( 'lodash', 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/token-list/index.js' ),
 		true
 	);
@@ -167,7 +167,7 @@ function gutenberg_register_scripts_and_styles() {
 	wp_register_script(
 		'wp-api-fetch',
 		gutenberg_url( 'build/api-fetch/index.js' ),
-		array( 'wp-hooks', 'wp-i18n' ),
+		array( 'wp-polyfill-ecmascript', 'wp-hooks', 'wp-i18n' ),
 		filemtime( gutenberg_dir_path() . 'build/api-fetch/index.js' ),
 		true
 	);
@@ -175,8 +175,7 @@ function gutenberg_register_scripts_and_styles() {
 		'wp-api-fetch',
 		gutenberg_get_script_polyfill(
 			array(
-				'\'Promise\' in window' => 'wp-polyfill-promise',
-				'\'fetch\' in window'   => 'wp-polyfill-fetch',
+				'\'fetch\' in window' => 'wp-polyfill-fetch',
 			)
 		),
 		'before'
@@ -201,35 +200,35 @@ function gutenberg_register_scripts_and_styles() {
 	wp_register_script(
 		'wp-deprecated',
 		gutenberg_url( 'build/deprecated/index.js' ),
-		array( 'wp-hooks' ),
+		array( 'wp-polyfill-ecmascript', 'wp-hooks' ),
 		filemtime( gutenberg_dir_path() . 'build/deprecated/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-blob',
 		gutenberg_url( 'build/blob/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/blob/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-compose',
 		gutenberg_url( 'build/compose/index.js' ),
-		array( 'wp-element', 'wp-is-shallow-equal', 'lodash' ),
+		array( 'lodash', 'wp-element', 'wp-is-shallow-equal', 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/compose/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-keycodes',
 		gutenberg_url( 'build/keycodes/index.js' ),
-		array( 'lodash' ),
+		array( 'lodash', 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/keycodes/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-html-entities',
 		gutenberg_url( 'build/html-entities/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/html-entities/index.js' ),
 		true
 	);
@@ -237,10 +236,11 @@ function gutenberg_register_scripts_and_styles() {
 		'wp-data',
 		gutenberg_url( 'build/data/index.js' ),
 		array(
-			'wp-element',
+			'lodash',
 			'wp-compose',
+			'wp-element',
 			'wp-is-shallow-equal',
-			'lodash',
+			'wp-polyfill-ecmascript',
 			'wp-redux-routine',
 		),
 		filemtime( gutenberg_dir_path() . 'build/data/index.js' ),
@@ -264,14 +264,14 @@ function gutenberg_register_scripts_and_styles() {
 	wp_register_script(
 		'wp-core-data',
 		gutenberg_url( 'build/core-data/index.js' ),
-		array( 'wp-data', 'wp-api-fetch', 'wp-url', 'lodash' ),
+		array( 'wp-data', 'wp-api-fetch', 'wp-polyfill-ecmascript', 'wp-url', 'lodash' ),
 		filemtime( gutenberg_dir_path() . 'build/core-data/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-dom',
 		gutenberg_url( 'build/dom/index.js' ),
-		array( 'wp-tinymce', 'lodash' ),
+		array( 'lodash', 'wp-polyfill-ecmascript', 'wp-tinymce' ),
 		filemtime( gutenberg_dir_path() . 'build/dom/index.js' ),
 		true
 	);
@@ -285,7 +285,7 @@ function gutenberg_register_scripts_and_styles() {
 	wp_register_script(
 		'wp-block-serialization-spec-parser',
 		gutenberg_url( 'build/block-serialization-spec-parser/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/block-serialization-spec-parser/index.js' ),
 		true
 	);
@@ -301,21 +301,21 @@ function gutenberg_register_scripts_and_styles() {
 	wp_register_script(
 		'wp-shortcode',
 		gutenberg_url( 'build/shortcode/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/shortcode/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-redux-routine',
 		gutenberg_url( 'build/redux-routine/index.js' ),
-		array(),
+		array( 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/redux-routine/index.js' ),
 		true
 	);
 	wp_register_script(
 		'wp-date',
 		gutenberg_url( 'build/date/index.js' ),
-		array( 'moment' ),
+		array( 'moment', 'wp-polyfill-ecmascript' ),
 		filemtime( gutenberg_dir_path() . 'build/date/index.js' ),
 		true
 	);
@@ -357,7 +357,7 @@ function gutenberg_register_scripts_and_styles() {
 	wp_register_script(
 		'wp-element',
 		gutenberg_url( 'build/element/index.js' ),
-		array( 'react', 'react-dom', 'lodash' ),
+		array( 'wp-polyfill-ecmascript', 'react', 'react-dom', 'lodash' ),
 		filemtime( gutenberg_dir_path() . 'build/element/index.js' ),
 		true
 	);
@@ -378,6 +378,7 @@ function gutenberg_register_scripts_and_styles() {
 			'wp-i18n',
 			'wp-is-shallow-equal',
 			'wp-keycodes',
+			'wp-polyfill-ecmascript',
 			'wp-url',
 		),
 		filemtime( gutenberg_dir_path() . 'build/components/index.js' ),
@@ -401,26 +402,17 @@ function gutenberg_register_scripts_and_styles() {
 			'wp-hooks',
 			'wp-i18n',
 			'wp-is-shallow-equal',
+			'wp-polyfill-ecmascript',
 			'wp-shortcode',
 			'lodash',
 		),
 		filemtime( gutenberg_dir_path() . 'build/blocks/index.js' ),
 		true
 	);
-
-	wp_add_inline_script(
-		'wp-blocks',
-		gutenberg_get_script_polyfill(
-			array(
-				'\'Promise\' in window' => 'wp-polyfill-promise',
-			)
-		),
-		'before'
-	);
 	wp_register_script(
 		'wp-viewport',
 		gutenberg_url( 'build/viewport/index.js' ),
-		array( 'wp-element', 'wp-data', 'wp-compose', 'lodash' ),
+		array( 'wp-polyfill-ecmascript', 'wp-element', 'wp-data', 'wp-compose', 'lodash' ),
 		filemtime( gutenberg_dir_path() . 'build/viewport/index.js' ),
 		true
 	);
@@ -437,13 +429,14 @@ function gutenberg_register_scripts_and_styles() {
 			'wp-blocks',
 			'wp-components',
 			'wp-compose',
-			'wp-data',
 			'wp-core-data',
+			'wp-data',
 			'wp-editor',
 			'wp-element',
 			'wp-html-entities',
 			'wp-i18n',
 			'wp-keycodes',
+			'wp-polyfill-ecmascript',
 			'wp-url',
 			'wp-viewport',
 		),
@@ -453,10 +446,24 @@ function gutenberg_register_scripts_and_styles() {
 	wp_register_script(
 		'wp-nux',
 		gutenberg_url( 'build/nux/index.js' ),
-		array( 'wp-element', 'wp-components', 'wp-compose', 'wp-data', 'wp-i18n', 'lodash' ),
+		array(
+			'wp-element',
+			'wp-components',
+			'wp-compose',
+			'wp-data',
+			'wp-i18n',
+			'wp-polyfill-ecmascript',
+			'lodash',
+		),
 		filemtime( gutenberg_dir_path() . 'build/nux/index.js' ),
 		true
 	);
+	wp_register_script(
+		'wp-plugins',
+		gutenberg_url( 'build/plugins/index.js' ),
+		array( 'lodash', 'wp-compose', 'wp-element', 'wp-hooks', 'wp-polyfill-ecmascript' ),
+		filemtime( gutenberg_dir_path() . 'build/plugins/index.js' )
+	);
 	// Loading the old editor and its config to ensure the classic block works as expected.
 	wp_add_inline_script(
 		'editor',
@@ -585,6 +592,7 @@ function gutenberg_register_scripts_and_styles() {
 			'wp-is-shallow-equal',
 			'wp-keycodes',
 			'wp-nux',
+			'wp-polyfill-ecmascript',
 			'wp-tinymce',
 			'wp-token-list',
 			'wp-url',
@@ -617,6 +625,7 @@ function gutenberg_register_scripts_and_styles() {
 			'wp-i18n',
 			'wp-keycodes',
 			'wp-plugins',
+			'wp-polyfill-ecmascript',
 			'wp-viewport',
 		),
 		filemtime( gutenberg_dir_path() . 'build/edit-post/index.js' ),
@@ -714,13 +723,6 @@ function gutenberg_register_scripts_and_styles() {
 	);
 	wp_style_add_data( 'wp-block-library-theme', 'rtl', 'replace' );
 
-	wp_register_script(
-		'wp-plugins',
-		gutenberg_url( 'build/plugins/index.js' ),
-		array( 'lodash', 'wp-element', 'wp-hooks', 'wp-compose' ),
-		filemtime( gutenberg_dir_path() . 'build/plugins/index.js' )
-	);
-
 	if ( defined( 'GUTENBERG_LIVE_RELOAD' ) && GUTENBERG_LIVE_RELOAD ) {
 		$live_reload_url = ( GUTENBERG_LIVE_RELOAD === true ) ? 'http://localhost:35729/livereload.js' : GUTENBERG_LIVE_RELOAD;
 
@@ -834,7 +836,12 @@ function gutenberg_register_vendor_scripts() {
 	);
 	gutenberg_register_vendor_script(
 		'wp-polyfill-promise',
-		'https://unpkg.com/promise-polyfill@7.0.0/dist/promise' . $suffix . '.js'
+		'https://unpkg.com/promise-polyfill@7.0.0/dist/promise' . $suffix . '.js',
+		array( 'wp-deprecated' )
+	);
+	wp_add_inline_script(
+		'wp-polyfill-promise',
+		'wp.deprecated( "wp-polyfill-promise script handle", { plugin: "Gutenberg", version: "4.0" } );'
 	);
 	gutenberg_register_vendor_script(
 		'wp-polyfill-formdata',
@@ -844,6 +851,10 @@ function gutenberg_register_vendor_scripts() {
 		'wp-polyfill-node-contains',
 		'https://unpkg.com/polyfill-library@3.26.0-0/polyfills/Node/prototype/contains/polyfill.js'
 	);
+	gutenberg_register_vendor_script(
+		'wp-polyfill-ecmascript',
+		'https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/7.0.0/polyfill' . $suffix . '.js'
+	);
 }
 
 /**
diff --git a/packages/babel-preset-default/CHANGELOG.md b/packages/babel-preset-default/CHANGELOG.md
index 79b5acdc2646e5..dfb37a7b589100 100644
--- a/packages/babel-preset-default/CHANGELOG.md
+++ b/packages/babel-preset-default/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 3.0.0 (Unreleased)
+
+## Breaking Change
+
+- The configured `@babel/preset-env` preset will no longer pass `useBuiltIns: 'usage'` as an option. It is therefore expected that a polyfill serve in its place, if necessary.
+
 ## 2.1.0 (2018-09-05)
 
 ### New Feature
diff --git a/packages/babel-preset-default/index.js b/packages/babel-preset-default/index.js
index d62a0c02dd24f3..a2bfedebe1b370 100644
--- a/packages/babel-preset-default/index.js
+++ b/packages/babel-preset-default/index.js
@@ -8,7 +8,6 @@ module.exports = function( api ) {
 				targets: {
 					browsers: [ 'extends @wordpress/browserslist-config' ],
 				},
-				useBuiltIns: 'usage',
 			} ],
 			isTestEnv && [ '@babel/preset-env', {
 				useBuiltIns: 'usage',
@@ -20,7 +19,12 @@ module.exports = function( api ) {
 				pragma: 'createElement',
 			} ],
 			'@babel/plugin-proposal-async-generator-functions',
-			! isTestEnv && [ '@babel/plugin-transform-runtime', { corejs: 2 } ],
+			! isTestEnv && [ '@babel/plugin-transform-runtime', {
+				corejs: false, // We polyfill so we don't need core-js.
+				helpers: true,
+				regenerator: false, // We polyfill so we don't need regenerator.
+				useESModules: false,
+			} ],
 		].filter( Boolean ),
 	};
 };
diff --git a/packages/babel-preset-default/test/__snapshots__/index.js.snap b/packages/babel-preset-default/test/__snapshots__/index.js.snap
index 683fe20da4ec3f..5cf000511103d0 100644
--- a/packages/babel-preset-default/test/__snapshots__/index.js.snap
+++ b/packages/babel-preset-default/test/__snapshots__/index.js.snap
@@ -1,36 +1,9 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`Babel preset default transpilation works properly 1`] = `
-"\\"use strict\\";
-
-require(\\"regenerator-runtime/runtime\\");
-
-require(\\"core-js/modules/es7.symbol.async-iterator\\");
-
-require(\\"core-js/modules/es6.symbol\\");
-
-require(\\"core-js/modules/es6.promise\\");
-
-function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }
-
-function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, \\"next\\", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, \\"throw\\", err); } _next(undefined); }); }; }
-
-function _awaitAsyncGenerator(value) { return new _AwaitValue(value); }
-
-function _wrapAsyncGenerator(fn) { return function () { return new _AsyncGenerator(fn.apply(this, arguments)); }; }
-
-function _AsyncGenerator(gen) { var front, back; function send(key, arg) { return new Promise(function (resolve, reject) { var request = { key: key, arg: arg, resolve: resolve, reject: reject, next: null }; if (back) { back = back.next = request; } else { front = back = request; resume(key, arg); } }); } function resume(key, arg) { try { var result = gen[key](arg); var value = result.value; var wrappedAwait = value instanceof _AwaitValue; Promise.resolve(wrappedAwait ? value.wrapped : value).then(function (arg) { if (wrappedAwait) { resume(\\"next\\", arg); return; } settle(result.done ? \\"return\\" : \\"normal\\", arg); }, function (err) { resume(\\"throw\\", err); }); } catch (err) { settle(\\"throw\\", err); } } function settle(type, value) { switch (type) { case \\"return\\": front.resolve({ value: value, done: true }); break; case \\"throw\\": front.reject(value); break; default: front.resolve({ value: value, done: false }); break; } front = front.next; if (front) { resume(front.key, front.arg); } else { back = null; } } this._invoke = send; if (typeof gen.return !== \\"function\\") { this.return = undefined; } }
-
-if (typeof Symbol === \\"function\\" && Symbol.asyncIterator) { _AsyncGenerator.prototype[Symbol.asyncIterator] = function () { return this; }; }
-
-_AsyncGenerator.prototype.next = function (arg) { return this._invoke(\\"next\\", arg); };
-
-_AsyncGenerator.prototype.throw = function (arg) { return this._invoke(\\"throw\\", arg); };
-
-_AsyncGenerator.prototype.return = function (arg) { return this._invoke(\\"return\\", arg); };
-
-function _AwaitValue(value) { this.wrapped = value; }
-
+"import _asyncToGenerator from \\"@babel/runtime/helpers/asyncToGenerator\\";
+import _awaitAsyncGenerator from \\"@babel/runtime/helpers/awaitAsyncGenerator\\";
+import _wrapAsyncGenerator from \\"@babel/runtime/helpers/wrapAsyncGenerator\\";
 describe('Babel preset default', function () {
   function foo() {
     return _foo.apply(this, arguments);
diff --git a/packages/babel-preset-default/test/index.js b/packages/babel-preset-default/test/index.js
index 583326d065152a..7465ce2f73512d 100644
--- a/packages/babel-preset-default/test/index.js
+++ b/packages/babel-preset-default/test/index.js
@@ -16,6 +16,7 @@ describe( 'Babel preset default', () => {
 
 		const output = transform( input, {
 			configFile: false,
+			envName: 'production',
 			presets: [ babelPresetDefault ],
 		} );
 
diff --git a/packages/components/src/toolbar/style.scss b/packages/components/src/toolbar/style.scss
index 8bb56b274b2de0..13d609e3d65584 100644
--- a/packages/components/src/toolbar/style.scss
+++ b/packages/components/src/toolbar/style.scss
@@ -3,6 +3,7 @@
 	border: $border-width solid $light-gray-500;
 	background-color: $white;
 	display: flex;
+	flex-shrink: 0;
 }
 
 div.components-toolbar {
diff --git a/packages/editor/src/components/rich-text/format-toolbar/style.scss b/packages/editor/src/components/rich-text/format-toolbar/style.scss
index 510b62166ecc70..1e1df05d7c99ae 100644
--- a/packages/editor/src/components/rich-text/format-toolbar/style.scss
+++ b/packages/editor/src/components/rich-text/format-toolbar/style.scss
@@ -1,5 +1,6 @@
 .editor-format-toolbar {
-	display: inline-flex;
+	display: flex;
+	flex-shrink: 0;
 }
 
 .editor-format-toolbar__link-container {