It's no secret that web technologies are everywhere now. Be it embedded platforms, cloud software, mobile and desktop apps, your toaster and microve and yes, also the web, imagine that. More and more people are starting to write code in JavaScript, and it's slowly, but surely becoming a universal programming language. Given the low barrier of the language, it's only natural that GNOME also has decided to go with JavaScript for the desktop apps. However to rephrase a quote infamous meme - it is not the same JavaScript that you're used to.
First time for everything - GNOME JavaScript
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GNOME
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JavaScript
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Linux