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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.
Redux core uses plain Rollup, and outputs a couple different bundle files. It has an unpublished TS conversion on master, and the current builds are on the 4.x branch. See the rollup.config.js file on both branches.
React-Redux also uses Rollup, but just outputs individual Babel-transformed files. master is a mostly-complete TS conversion that's in preparation for an upcoming v8 release, 7.x is the current live version. Again, see rollup.config.js.
Redux Toolkit uses a custom combination of ESBuild + TypeScript, outputs numerous different build formats (CJS/ESM/UMD, each with variations), and also has multiple entry points. See scripts/build.ts for the build logic and a list of output formats.