Well, maybe not. It seems to have frozen in npm run dev:
> jsforwp-blocks@2.0.0 dev /Users/russellweller/Sites/wpblocks/wp-content/plugins/gutenberg-course-master
> cross-env BABEL_ENV=default webpack –watch
Webpack is watching the files…
Hash: 45459f496af61c52f922
Version: webpack 3.12.0
Time: 3636ms
Asset Size Chunks Chunk Names
./assets/js/editor.blocks.js 473 kB 0 [emitted] [big] ./assets/js/editor.blocks
./assets/js/frontend.blocks.js 3.02 kB 1 [emitted] ./assets/js/frontend.blocks
./assets/css/blocks.style.css 5.67 kB 0 [emitted] ./assets/js/editor.blocks
./assets/css/blocks.editor.css 658 bytes 0 [emitted] ./assets/js/editor.blocks
[49] ./blocks/index.js 444 bytes {0} [built]
[50] ./blocks/i18n.js 51 bytes {0} [built]
[51] ./blocks/01-static/index.js 1.63 kB {0} [built]
[55] ./blocks/02-richtext/index.js 2.18 kB {0} [built]
[58] ./blocks/03-text-alignment-toolbar/index.js 2.73 kB {0} [built]
[60] ./blocks/04-block-alignment-toolbar/index.js 3.64 kB {0} [built]
[62] ./blocks/05-custom-toolbar/index.js 5 kB {0} [built]
[69] ./blocks/07-inspector-control-fields/index.js 3.24 kB {0} [built]
[117] ./blocks/08-form-fields/index.js 2.31 kB {0} [built]
[123] ./blocks/10-media-upload/index.js 3.65 kB {0} [built]
[126] ./blocks/11-url-input/index.js 3.99 kB {0} [built]
[128] ./blocks/11-url-input-conditional/index.js 4.18 kB {0} [built]
[130] ./blocks/12-dynamic/index.js 2.01 kB {0} [built]
[133] ./blocks/14-meta-box/index.js 2.1 kB {0} [built]
[136] ./blocks/frontend.js 33 bytes {1} [built]
+ 122 hidden modules
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[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–1-2!./node_modules/sass-loader/lib/loader.js??ref–1-3!./blocks/14-meta-box/style.scss 85 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–1-2!node_modules/sass-loader/lib/loader.js??ref–1-3!blocks/12-dynamic/style.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–1-2!./node_modules/sass-loader/lib/loader.js??ref–1-3!./blocks/12-dynamic/style.scss 182 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–1-2!node_modules/sass-loader/lib/loader.js??ref–1-3!blocks/08-form-fields/style.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–1-2!./node_modules/sass-loader/lib/loader.js??ref–1-3!./blocks/08-form-fields/style.scss 635 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–1-2!node_modules/sass-loader/lib/loader.js??ref–1-3!blocks/07-inspector-control-fields/style.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–1-2!./node_modules/sass-loader/lib/loader.js??ref–1-3!./blocks/07-inspector-control-fields/style.scss 958 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–1-2!node_modules/sass-loader/lib/loader.js??ref–1-3!blocks/06-inspector-controls/style.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–1-2!./node_modules/sass-loader/lib/loader.js??ref–1-3!./blocks/06-inspector-controls/style.scss 898 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–1-2!node_modules/sass-loader/lib/loader.js??ref–1-3!blocks/05-custom-toolbar/style.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–1-2!./node_modules/sass-loader/lib/loader.js??ref–1-3!./blocks/05-custom-toolbar/style.scss 858 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–1-2!node_modules/sass-loader/lib/loader.js??ref–1-3!blocks/04-block-alignment-toolbar/style.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–1-2!./node_modules/sass-loader/lib/loader.js??ref–1-3!./blocks/04-block-alignment-toolbar/style.scss 731 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–1-2!node_modules/sass-loader/lib/loader.js??ref–1-3!blocks/03-text-alignment-toolbar/style.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–1-2!./node_modules/sass-loader/lib/loader.js??ref–1-3!./blocks/03-text-alignment-toolbar/style.scss 723 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–1-2!node_modules/sass-loader/lib/loader.js??ref–1-3!blocks/02-richtext/style.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–1-2!./node_modules/sass-loader/lib/loader.js??ref–1-3!./blocks/02-richtext/style.scss 476 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–1-2!node_modules/sass-loader/lib/loader.js??ref–1-3!blocks/01-static/style.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–1-2!./node_modules/sass-loader/lib/loader.js??ref–1-3!./blocks/01-static/style.scss 464 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–2-2!node_modules/sass-loader/lib/loader.js??ref–2-3!blocks/10-media-upload/editor.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–2-2!./node_modules/sass-loader/lib/loader.js??ref–2-3!./blocks/10-media-upload/editor.scss 495 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–2-2!node_modules/sass-loader/lib/loader.js??ref–2-3!blocks/05-custom-toolbar/editor.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–2-2!./node_modules/sass-loader/lib/loader.js??ref–2-3!./blocks/05-custom-toolbar/editor.scss 109 bytes {0} [built]
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/raw-loader/index.js!node_modules/postcss-loader/lib/index.js??ref–2-2!node_modules/sass-loader/lib/loader.js??ref–2-3!blocks/01-static/editor.scss:
[0] ./node_modules/raw-loader!./node_modules/postcss-loader/lib??ref–2-2!./node_modules/sass-loader/lib/loader.js??ref–2-3!./blocks/01-static/editor.scss 133 bytes {0} [built]