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Snowpack
Discontinued ESM-powered frontend build tool. Instant, lightweight, unbundled development. ✌️ [Moved to: https://github.com/FredKSchott/snowpack] (by withastro)
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proposal-Array.prototype.includes
Discontinued Spec, tests, reference implementation, and docs for ESnext-track Array.prototype.includes
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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.
If extending global objects like that wasn't allowed then it wouldn't be a problem - that's the horrific part in my opinion. They even had to rename a new array method as it would've broken a popular library at the time.