The new editor in Obsidian was made possible by CodeMirror 6, and it has been powering both the Live Preview mode (like Typora) and the source mode in Obsidian ever since.
It can be a bit overwhelming to get into first, but as we experimented more with it, we found it to be extremely extensible and powerful. It's also highly performant for large documents. Another major reason we chose CM 6 is that it's also one of the only code editors that work decently on mobile.
While developing the new editor, Marijn was also amazingly responsive in investigating and fixing all the big and little things we ran into, even relatively niche issues like IME input bugs.
If you find CM 6 useful, consider what you can to support the project! Funding link is here: https://marijnhaverbeke.nl/fund/