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SurveyJS
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Well, you could have a look at Ramda's types if you want to see how far you can take the type system to accommodate composition and lens functions.
This: https://github.com/ezolenko/rollup-plugin-typescript2/issues/148#issuecomment-483274587
Typescript being more limited than I thought. I came to typescript thinking it'd solve my all my static typing issues but it can't even handle large range types. Eg: You can't make a type that handles integers from 0 to 100. Like if it existed it'd streamline my process by so much but it doesn't, and it seems like it'd be such a simple fix too: just check all the variables with that type are more than or equal to 0 and less than or equal to 100. No need to create all the various types individually from 0 to 100, just create a range. There's even a suggestion about it on the typescript github from 2017 but it doesn't seem like it's going anywhere despite being the second most thumbed up suggestion: https://github.com/microsoft/TypeScript/issues/15480