Goal

This post is detailed description of adding giscus and i18n to website built by Docusaurus.

Add giscus comments feature

Preparations

Enable discussion feature for your website's public github repo, it can be done in repo's Settings/General/Features. This is the doc you can refer.
Configure giscus in your Github account and in section "Repository access" add only your website repo to be accessed by giscus

Get props value

In giscus website, your can get props value in section "Configuration"
In "Page ↔️ Discussions Mapping" part, I recommend choosing "Discussion title contains page <title>", so that the change of url won't affect the searching result.
In "Discussion Category" part you can Announcements as recommended.
In "Enable giscus" part, you can get the props value, you can find that if you modify settings above, the value will change accordingly.
giscus has wrapper componet, you can use @giscus/react

Create giscus component

install @giscus/react

pnpm install @giscus/react

create src/components/Giscus.tsx file:

import React from "react";
import Giscus from "@giscus/react";
import { useColorMode } from "@docusaurus/theme-common";

export default function GiscusComponent() {
  const { colorMode } = useColorMode();

  return (
    <Giscus
      repo="username/repo" // need to change
      repoId="R_kgxxxxxx" // need to change 
      category="Announcements"
      categoryId="DIC_your category id" // need to change
      mapping="title"
      term="Welcome to @giscus/react component!"
      strict="0"
      reactionsEnabled="1"
      emitMetadata="0"
      inputPosition="bottom"
      theme={colorMode}
      lang="en"
      loading="lazy"
    />
  );
}

Add component to blogs and docs

Use swizzle command to create BlogPostItem and DocItem/Footer in src/theme directory

pnpm run swizzle @docusaurus/theme-classic BlogPostItem -- --wrap

pnpm run swizzle @docusaurus/theme-classic DocItem/Footer -- --wrap

Add GiscusComponent to BlogPostItem and DocItem

//src/theme/BlogPostItem/index.js

import React from "react";
import BlogPostItem from "@theme-original/BlogPostItem";
import GiscusComponent from "@site/src/components/GiscusComponent";

export default function BlogPostItemWrapper(props) {
  return (
    <>
      <BlogPostItem {...props} />
      <GiscusComponent />
    </>
  );
}

//src/theme/DocItem/Footer/index.js

import React from "react";
import Footer from "@theme-original/DocItem/Footer";
import GiscusComponent from "@site/src/components/GiscusComponent";

export default function FooterWrapper(props) {
  return (
    <>
      <GiscusComponent />
      <Footer {...props} />
    </>
  );
}

Add i18n

Actually, you can just follow this tutorial. I will give some tips about the tutorial

you can just the code example below to configure i18n settings if you don't have complicated requirements.

//docusaurus.config.js

i18n: {
    defaultLocale: 'fr',
    locales: ['en', 'fr'],
  },

As shown in the picture, run pnpm run write-translations --locale en will generate a lot of files.

You should copy your docs and blogs to i18n/en/docusaurus-plugin-content-docs/current and i18n/fr/docusaurus-plugin-content-blog.
Note: you need to create current directory by yourself

References

giscus.app

giscus-component

docusaurus swizzle

docusaurus i18n tutorial

Add giscus comments and i18n to Docusaurus