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As a solo-developer for Secutils.dev, I operate with very limited resources and cannot accommodate every user's feature request, even if I wish to. On the other hand, prioritizing and developing features based on assumptions and limited upfront user feedback has its own challenges and risks. That's why, right from the start, I've been considering adding some sort of "extension points" into Secutils.dev that would allow users to customize the certain behavior of the utilities according to their needs.
Protecting against memory-hungry scripts in Deno is more challenging. I won't go into details about how it works and instead direct you to the issue in the Deno repository with all the details. In short, you need to create a JavaScript runtime with a specific heap limit and add a callback that's invoked when the memory limits are approached. This gives you a chance to terminate the execution before Deno/V8 crashes the entire process.