He’s not wrong

• xstate

  60 26,186 9.6 TypeScript

  Actor-based state management & orchestration for complex app logic.

  

For context - He wrote xstate, one of the more complex typescript projects out there. I have been using the lib as of late and was pretty surprised that he was able to get the typing to work everywhere. I am still having a hard time understanding how the generics work inside the project (and sadly have been using any’s in a lot of places) but still quite impressed that the entire library is typesafe. I think he is in the position to make this joke!

• DefinitelyTyped

  158 47,199 10.0 TypeScript

  The repository for high quality TypeScript type definitions.

  

The problems described in the post will be fixed in the React 18 types since we remove {} from ReactNode

• SurveyJS

  surveyjs.io featured

  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.

  

• TypeScript

  1,307 98,169 9.9 TypeScript

  TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

  

It's React.ReactNode but TypeScript will reject that during type-checking. This is not a limitation in @types/react but TypeScript itself: https://github.com/microsoft/TypeScript/pull/29818

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