What's actually getting faster is the TypeScript compiler, not the TypeScript language itself or the JavaScript's runtime performance. Your TypeScript code will compile faster, but it won't suddenly execute 10x faster in the browser or Node.js. It's a bit like saying, "We made your car 10x faster!" and then clarifying that they only made the manufacturing process faster—the car itself still drives at the same speed. It's still valuable, especially if you've been waiting months for your car, but not quite what the headline suggests. Hadn't considered that people might misinterpret it this way, I suppose if you only read headlines that complaint is reasonable. The article itself was pretty clear what they were talking about. More on reddit.com

Yes it compiles to vanilla JS. This chart is basically click bait as it's been reposted constantly but there's really no way to account for all the factors that would influence a language's net power consumption. The only reasonable justification for a difference would be the additional compute required to type check when building, but the idea that would result in a 500% total increase compared to JS is nonsense. More on reddit.com

I would say that TS doesn't do things JS cannot do, from a functional PoV, since TS is "compiled" to JS, and often the result is very close of the initial code. Why would you want a better control over the data types? To take a trivial example, you can make a function taking a number to do a computation. In JS, you can call it with a string (a mistake easy to do), it will throw a runtime error and the program will stop. TypeScript would make an error at compile time, and even at the time you type the call, in a smart text editor like Visual Studio Code or similar. So you can avoid some runtime errors and gain some time. In a less trivial but similar and more realistic case, you can pass a complex object, TS will warn if you pass the wrong object (type). And you can build relatively complex types. Likewise, in classes, you can make private members. It was simulating them actually, but it was useful. Now JS has real private members. In short, TypeScript adds rules that limits you, which can be a good thing to avoid trivial and subtle programming errors, and it can be expressive, leading to quite self-documenting code, and it helps smart editors for auto-completion and inline documentation. There is so much more to say, but this post is already quite long… More on reddit.com

You'll thank yourself in the long term, if you use typescript for your current projects More on reddit.com