На 22-03-2019 структура следующая:

src/components
├── assets
│   ├── images
│   │   ├── bestsp.png
│   │   └── sliza.png
├── constants.js
├── hideWidgets.js
├── logger.js
├── widget.js
├── widget.scss

• widget.js -- основной код виджета;
• widget.scss -- верстка;
• costants.js -- настроечные константы парсеров и виджета, все данные должны быть всегда здесь;
• hideWidgets.js -- функция поиска на странице кнопок сторонних парсеров и их скрытие;
• logger.js -- логгер, все сообщения в консоль должны быть только здесь;

Все что требует допастройки прописываем тут:

// Grabli
// const script3 = document.createElement('script');
// Q-Parcer
// const script5 = document.createElement('script');

// // FIXME: Грабли не работает! Возможно нужен авторизованный виджет, data-uuid на это намекает
// script3.type = 'text/javascript';
// script3.src = 'https://grably-parser.ru/js/parser_widget.js';
// // script3.setAttribute('data-uuid', '0016f430-856c-50b8-aba6-54f61c5766b6');
// script3.setAttribute('data-position', 'position-bottom-left');
// script3.setAttribute('data-color', '#fdc049');
// script3.setAttribute(
//   'data-style',
//   'background-color: #fdc049; color: white'
// );
// // data-color="#fdc049" data-style="background-color: #fdc049; color: white"

// // FIXME: Q-Parcer требует регистрации сайта в каталоге
// script5.type = 'text/javascript';
// script5.async = true;
// script5.defer = true;
// script5.src =
//   'https://q-parser.ru/dist/widget.js?c=%232f353e&domain=&p=lc&run=false&tc=%23fff&u=0';

Как настраивать скрипт, когда у него нет src, а код прямо теге text:

// Важно!!!
// window.onload = function() {
// var s = document.createElement('script');
// s.type = 'text/javascript';
// var code = 'alert("hello world!");';
// try {
//   s.appendChild(document.createTextNode(code));
//   document.body.appendChild(s);
// } catch (e) {
//   s.text = code;
//   document.body.appendChild(s);
// }
// }

Создано на основе репозитория: https://github.com/seriousben/embeddable-react-widget

Easy creation of an embeddable widget. - https://seriousben.github.io/embeddable-react-widget

• Full ES6/ES2015 support (with Babel)
• Package fonts, css, json, javascripts together into one single package (with Webpack)
• No css styling conflicts between the host page and the widget (with https://github.com/premasagar/cleanslate)
• Bookmarklet supported for fast testing and demonstration
• User theming of widget
• Obfuscating of the widget code
• Unit Tested with code coverage enabled
• Continuous Integration ready

$ npm install

$ npm start
... server running at http://localhost:8080/

$ npm test
... test output

$ npm run build
... create files in /dist

• Widget as react app - index.html works (webpack, babel, react)
• React widget (widget builder)
• Webpack changed to output a library
• Add tests
• Add circleci integration
• Add codecov integration for codecoverage
• Production Build
• Minified
• Add greenkeeper
• Bookmarklet
• Reset / Cleanslate / No-conflicts of styles
• Obfuscation
• Theming support
• Storyboard and docs
• Integrate eslint with webpack

• Usable using a simple <script> tag
• Configurable with code
• Themable

• Interaction between the frame and the hosting page is tricky and not recommended
• You can only display content within the iframe
• iframe and content resizing is impossible
• iframe sandboxing can result in missing functionalities

Read more about about widgets, react and scoping of css.

• https://www.robinwieruch.de/minimal-react-webpack-babel-setup/#hot-module-replacement
• https://codeburst.io/building-react-widget-libraries-using-webpack-e0a140c16ce4
• https://github.com/timarney/react-app-rewired
• https://github.com/premasagar/cleanslate
• https://github.com/krasimir/third-party-react-widget
• https://github.com/jenyayel/js-widget
• https://github.com/anakinjay/react-widget-starter
• https://webpack.js.org/guides/author-libraries/
• https://github.com/webpack-contrib/webpack-serve
• https://medium.freecodecamp.org/part-1-react-app-from-scratch-using-webpack-4-562b1d231e75
• https://github.com/facebook/create-react-app/blob/next/packages/react-scripts/config/webpack.config.prod.js
• https://github.com/webpack-contrib/purifycss-webpack
• https://medium.com/quick-code/from-zero-to-deploy-set-up-react-stack-with-webpack-3-20b57d6cb8d7
• https://medium.com/dailyjs/building-a-react-component-with-webpack-publish-to-npm-deploy-to-github-guide-6927f60b3220
• http://krasimirtsonev.com/blog/article/javascript-library-starter-using-webpack-es6
• https://github.com/javascript-obfuscator/webpack-obfuscator
• https://github.com/tsileo/embedded-js-widget
• https://thomassileo.name/blog/2014/03/27/building-an-embeddable-javascript-widget-third-party-javascript/