It uses GitHub Issues as the comments' backend. So, you need to install the app on your GitHub repository in order to connect the two. After that, you just need to include a small script to your website.
The script will search for a matching issue based on the container page's
<title>, etc.) and display the issue's comments
on the page. If a matching issue doesn't exist, a bot will automatically create
it the first time someone leaves a comment.
I think the idea is really cool! However, I find it funny how it (ab)uses GitHub Issues: an issue tracker, which isn't really suitable for conversations. Yet, it's funny how utterances takes something and turn it into a completely different thing...
It works because GitHub's markdown renderer is very feature-rich. It works because GitHub Issues lets you add emoji reactions to comments. It works because people who would use it have audiences that are likely to have GitHub accounts, which they'd use rather than signing up for some random website.
If only we can lift those advantages off of the fact that it uses GitHub Issues, an issue tracker...
Last year, GitHub announced a new feature: GitHub Discussions! You've probably already heard (or used) it. If you haven't, I'll just quote from the announcement:
Until now, GitHub only offered issues and pull requests as places to have these conversations. But issues and pull requests both have a linear format—well suited for merging code, but not for creating a community knowledge base. Conversations need their own place—that’s what GitHub Discussions is for. ... Their threaded format makes it easy to start, respond to, and organize unstructured conversations.
That sounds like something that'd work much better for utterances. And it does.
GitHub Discussions was initially only available on select repositories. Then, it went live as a public beta in December last year.
However, it wasn't until February this year that the API became accessible.
So, I immediately began to work on it.
Initially, I wanted to fit Discussions support into utterances directly. However, with the obstacles I encountered and the limited time I have, I decided it would be much faster to build the thing from scratch.
giscus is a comments widget built on GitHub Discussions. It's really similar to utterances. Basically, just replace Issues in utterances with Discussions and you get giscus.
Even the landing page is similar.
Behind the scenes, though, it's quite different.
The Discussions API is only available through GitHub's GraphQL API. It requires
authentication for all requests, which means you can't fetch comments without
signing in. Plus, as Discussions is still in beta, it requires a custom
GraphQL-Features: discussions_api header to be set, which unfortunately has
Those are just some of the challenges that I faced. I already wrote more details and I almost included them here, but it would make this post be too long to be an announcement. (It probably already is). I'll just turn it into a separate blog post for later.
Anyway, in short, building giscus wasn't so easy as I originally thought it would be.
Thus, I'd really appreciate it if you would use it. Put it on your website. Tell your friends, too. Contribute.
And, try it, right below this blog post! 👇