[coldtea]

>It is very difficult to save the images as bitmap (.jpeg, .mpng) or vector (.svg)

Huh? It's quite trivial, and even some tools for VS Code and other environments support it.

>You basically have to use a headless browser rendering toolkit, and guess what? The images aren't consistent (different rendering styles)

Is your problem saving Mermaid as images or lamenting cross browser rendering consistency?

If it's the former, why is the latter a problem? Use a single headless browser rendering toolkit and stick with it. Who said you need to use multiple and compare?

And there are other ways to do it, like exporting from an actual in-browser render, or even a VS Code extension - it can also be found in other tools based on Electron.