Can you tell any other part of the compiler ecosystem that helps you write a new programming language in 1 hour?

This is supposed to be a fun article for experimentation in programming languages, not a new advancement in a garbage collection algorithm for increasing the efficiency of a datacenter by 2%.

My favourite new programming language is Svelte for example (just a parser that emits javascript), it's just a little different from HTML/CSS/JS, but just enough to make web development fun again for me.