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TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output. (by jakebailey)
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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.
What was years in the making turned into a hefty pull request with over 282,000 lines changed.
You can see the entire stack of changes I merged visualized kinda like it'd look in Gerrit here: https://github.com/jakebailey/TypeScript/pull/1
Out of curiosity, have you tried analyzing your codebase for sources of the slowdown? We have a really helpful tool called @typescript/analyze-trace which can give clues about the most expensive parts of compilation and type-checking.