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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.
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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.
Underneath the covers, the Angular CLI uses Webpack, a module bundler. Among other things, Webpack (with the help of many plugins) transforms the project code and assets into JavaScript bundles. Those bundles contain all of the code of the application, as well as the code of third-parties (e.g., Angular, and other libraries that you may use).
If you open up the index.html file in the sources of a brand new Angular application, you won't find any of the scripts that you saw above. Why? Because they're added by the build process. When you use the Angular CLI, it first reads the angular.json file (or angular-cli.json) to learn about the project's configuration. Then, based on that, it builds the whole application.