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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.
Tools however can use custom keys here as well, like "types", "browser", "development", or "production". This is nice, because it means tools can easily distinguish between environments without having to rely on process.env; this is how esm-env cleverly utilizes package exports to distinguish between development and production environments;
There are many quirks related to this however, for example if you use "types" it should always be the first entry in your exports, and if you use "default" it should always be the last entry in your exports. Package exports are easy to mess up, and get wrong. Thankfully, there's a really nice project called publint that helps you with things like these.