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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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webpack
A bundler for javascript and friends. Packs many modules into a few bundled assets. Code Splitting allows for loading parts of the application on demand. Through "loaders", modules can be CommonJs, AMD, ES6 modules, CSS, Images, JSON, Coffeescript, LESS, ... and your custom stuff.
For some days now, I've been working on a React Tab component that preserves the state of each Tab (or nav items) when it is clicked upon and when you navigate away from and back to where this component is mounted.
An example is this helper function — that extracts the heading texts from any markdown file — I worked on a while back. You can take a look at the configuration of the compiler here
Years back, one approach towards building these packages was completely dependent on the use of webpack as the go-to bundler, which also comes with a lot of plugins that can be used to bundle your JavaScript code.