Is there any way to make emacs display this kind of lines?

I have no idea what these lines are called, but what they did is basically indicate the range of the function. ​ https://preview.redd.it/zzvqarkajd591.png?width=1592&format=png&auto=webp&s=943907a1ce99ec263043bc73ffade85eab5d655f

I use [https://github.com/antonj/Highlight-Indentation-for-Emacs/](https://github.com/antonj/Highlight-Indentation-for-Emacs/) for it.. it's available on melpa.

Thank you! I literally don't know what's the name of it.

It just looks like indentation markers, so it's not really clever enough to detect functions scopes or anthing, but it works well enough with well-formatted code :) There are a number of packages for this.. Like this one looking more like your screenshot: [https://github.com/DarthFennec/highlight-indent-guides](https://github.com/DarthFennec/highlight-indent-guides)

Yes I like the latter one more. Thanks again!

While older than Highlight-Indentation-for-Emacs, you can see also [https://github.com/DarthFennec/highlight-indent-guides](https://github.com/DarthFennec/highlight-indent-guides), the latter supports dynamic indent width detection (may not be important for JS, though).

You're welcome, I just switched to the other one myself like a minute ago :D

It does look nicer and I just switched myself and (probably) ran into the same problem I had when trying out some of the indentation highlighting modes: It didn't show anything in my theme :D After switching from fill to character mode and adjusting the colours a bit, it's now looking a lot less chunky than before :)

Much appreciated!

This one isn't working correctly on emacs-git with pixel precision scrolling, I opened a bug report. The other one you have suggested below works perfectly, so thanks!

They don't seem to work with Tree-sitter though?

IIRC, the tree-sitter package implemented via modules outright disables font-lock-mode which explains why the package doesn't work for you.

That line is called a [vinculum](https://www.merriam-webster.com/dictionary/vinculum). I've waited more than a dozen years to use that word. LOL.

> a straight *horizontal* mark Is it though? That's from the second definition, but I can't see how the first definition fits any better.

Traditionally a vinculum was a horizontal line. It's purpose is to group a number of items together. That is a better definition. It doesn't have to be ***only*** horizontal, but IIRC it is modern code that has started using it as a vertical grouping. I don't know of any vertical use before that. [Here's the wikipedia page](https://en.wikipedia.org/wiki/Vinculum_(symbol)). You can see that it too sticks with the "horizontal only" definition. However, I don't see the advantage of insisting it cannot be vertical.

Thanks! Just learned this today

That was 2 years ago, tree-sitter does works with packages using font-lock-mode now.