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node-typescript-architecture
Hexagonal architecture / ports-and-adapters for Node.js using simple functional programming
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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.
I would also say that certain practices are invaluable for working efficiently, just as they are in a job. I don't unit test my open source work particularly religiously - to be honest, I don't feel it gives me much more confidence. But I do have a personal architecture (based on ports and adapters, if you're interested), that I stick to because it always allows me to keep my pure logic and IO / effects code strictly separated.