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Every serious programming language I've ever used...

https://docs.microsoft.com/en-us/dotnet/api/system.console.f...

It's even easier on UNIX-like terminals, where ANSI escape codes should work.

Okay? You gave one example, C#, and extrapolated that to every single serious programming language you've ever used. I just took a quick look and none of Java, ruby, python, and PHP has this functionality in its standard library. Also yes ANSI codes work but it's not easy to write or read, so that's what these libraries are for. I'm not a JS apologist but it seems inaccurate to imply that its need for a terminal colorization library is a unique deficiency of the language.

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