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I've wanted to take a look at some of the alternative JavaScript runtimes for a while. The thing that has held me back is npm compatibility. I want to be able to run my code in a runtime that isn't Node.js and still be able to use npm packages. I've been using ts-node for a long time now; it's what I reach for when I'm building any kind of console app. In this post I want to port a console app from ts-node to Bun and see how easy it is.
These scripts are implemented as a simple ts-node console app. For historical reasons it's called trim-xml (it originally just truncated the sitemap.xml file). It's not a particularly good name but I'm not going to change it now. As the blog is open source, you can see the [code of trim-xml here](https://github.com/johnnyreilly/blog.johnnyreilly.com/tree/main/trim-xml].
As well, a new bun.lockb file had appeared in the directory alongside the package.json. Although I can't find any documentation on it, I'm guessing that this is the Bun equivalent of package-lock.json or yarn.lock. It's a binary file, so you can't read it. I did find this project which allows you read bun.lockb files which looks like a useful way to solve that problem.