PWA Studio extending Storefront example

bash.sh

$ yarn create @magento/pwa
$ cd <project_dir>
$ yarn run buildpack create-custom-origin 
$ yarn run watch

extension.sh

$  yarn create @larsroettig/pwa-extension

local-intercept.js

 const { Targetables } = require('@magento/pwa-buildpack');

 module.exports = targets => {
   const targetables = Targetables.using(targets);
 
   const ProductFullDetailComponent = targetables.reactComponent(
       '@magento/venia-ui/lib/components/ProductFullDetail/productFullDetail.js'
   );

   ProductFullDetailComponent.insertBeforeJSX('<Button type="submit" />', '<span>Hello World! </span>');
 }