Initial commit.

.babelrc

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+{
+    "presets": [ "@babel/preset-env", "@babel/preset-react" ]
+}

.browserlistrc

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+> 1%
+ie >= 11
+last 1 Android versions
+last 1 ChromeAndroid versions
+last 2 Chrome versions
+last 2 Firefox versions
+last 2 Safari versions
+last 2 iOS versions
+last 2 Edge versions
+last 2 Opera versions

.gitignore

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+.vscode
+node_modules

block.js

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+const { registerBlockType } = wp.blocks;
+
+registerBlockType('gwg/esnext-starter', {
+    title: 'Get With Gutenberg - ESNext Starter',
+    category: 'common',
+
+    edit(props) {
+        return <p className={props.className}>Hello editor.</p>;
+    },
+
+    save(props) {
+        return <p className={props.className}>Hello saved content.</p>;
+    },
+});

editor.css

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+
+.wp-block-gwg-esnext-starter {
+    background-color: green;
+}

index.php

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+<?php
+/**
+ * Plugin Name: ESNext Starter - Get With Gutenberg
+ * Plugin URI: https://github.com/Wordpress
+ * Description: Demonstrate how to start building a Gutenberg block in ESNext.
+ * Version: 1.0.0
+ * Author: Get With Gutenberg
+ * Author URI: https://getwithgutenberg.com
+ * Text Domain: gwg
+ * Domain Path: languages
+ * License: GPL2+
+ * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
+ */
+
+defined( 'ABSPATH' ) || exit;
+
+define( 'GWG_ESNEXT_VERSION', '1.0.0' );
+define( 'GWG_ESNEXT_PLUGIN_DIR', dirname( __FILE__ ) );
+define( 'GWG_ESNEXT_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
+
+function gwg_block_assets() {
+	wp_enqueue_style(
+		'gwg-style-css',
+		GWG_ESNEXT_PLUGIN_URL . 'style.css',
+		[],
+		GWG_ESNEXT_VERSION
+	);
+}
+add_action( 'enqueue_block_assets', 'gwg_block_assets' );
+
+function gwg_editor_assets() {
+	wp_enqueue_script(
+		'gwg-block-js',
+		GWG_ESNEXT_PLUGIN_URL . 'block.build.js',
+		[],
+		GWG_ESNEXT_VERSION,
+		true // Enqueue script in the footer.
+	);
+
+	wp_enqueue_style(
+		'gwg-editor-css',
+		GWG_ESNEXT_PLUGIN_URL . 'editor.css',
+		[],
+		GWG_ESNEXT_VERSION
+	);
+}
+add_action( 'enqueue_block_editor_assets', 'gwg_editor_assets' );