We are in a golden age for new languages. You have https://microsoft.github.io/language-server-protocol/ https://microsoft.github.io/language-server-protocol/

We are in a golden age for new languages. You have https://microsoft.github.io/language-server-protocol/ https://microsoft.github.io/language-server-protocol/ for doing the integration between IDE and your parser. Also, https://highlightjs.org/ https://highlightjs.org/ which lets you broadcast your code in a pretty way. I do however feel that your QoL will depend on whether or not you make a compiler or a translator. The key benefit of a translator is that you can co-opt the host language's standard runtime and debugger.