Docusaurus OG enables you to automate the generation of custom OpenGraph (OG) images for your Docusaurus website, enhancing the visual representation of your content when shared on social media and other platforms.

This plugin leverages Vercel's Satori to convert your HTML and CSS into images. It lets you define image renderers tailored to each Docusaurus content plugin, allowing you to create unique OG images for your website's content.

To get started, simply follow these steps:

1. Install the plugin:

yarn add @acid-info/docusaurus-og

# or

npm install @acid-info/docusaurus-og

2. Integrate the plugin into your docusaurus.config.js:

plugins: [
  [
    '@acid-info/docusaurus-og',
    {
      path: './preview-images', // relative to the build directory
      imageRenderers: {},
    },
  ],
]

3. Define your image renderers for the content plugins of your choice. Here's an example:

imageRenderers: {
  'docusaurus-plugin-content-docs': require('./lib/ImageRenderers').docs,
  'docusaurus-plugin-content-pages': require('./lib/ImageRenderers').pages,
  'docusaurus-plugin-content-blog': require('./lib/ImageRenderers').blog,
}

An image renderer is a function that receives a data object representing page data and a context object representing the Docusaurus context. This function returns HTML or JSX content, which serves as input for Satori, the image generation tool. Satori processes this content to produce the corresponding OpenGraph image.

For example, here's an image renderer for the @docusaurus/plugin-content-docs plugin:

// src/ImageRenderers.tsx
import type { DocsPageData, ImageRenderer } from '@acid-info/docusaurus-og'
import { readFileSync } from 'fs'
import { join } from 'path'
import React from 'react'

export const docs: ImageRenderer<DocsPageData> = (data, context) => [
  <div style={{ display: 'flex', background: 'black', color: 'white' }}>
    {data.metadata.title}
  </div>,
  {
    width: 1200,
    height: 630,
    fonts: [
      {
        name: 'Inter',
        data: readFileSync(
          join(__dirname, '../../static/Inter/Inter-Regular.ttf'),
        ),
        weight: 400,
        style: 'normal',
      },
    ],
  },
]

If you wish to use JSX within your image renderer, you'll need to compile your code to JavaScript. Here's a TypeScript example:

1. Create a tsconfig.client.json file in your project root to compile your src directory:

// tsconfig.client.json
{
  "compilerOptions": {
    "noEmit": false,
    "composite": true,
    "incremental": true,
    "esModuleInterop": true,
    "tsBuildInfoFile": "./lib/.tsbuildinfo-client",
    "rootDir": "src",
    "outDir": "lib",
    "module": "CommonJS",
    "target": "esnext",
    "jsx": "react",
    "types": ["node"],
    "baseUrl": "./",
    "lib": ["DOM"]
  },
  "include": ["src"]
}

2. Add prestart and prebuild scripts to your package.json:

// package.json
{
  "scripts": {
    "prestart": "tsc --project tsconfig.client.json",
    "prebuild": "tsc --project tsconfig.client.json"
  }
}

3. Exclude the lib directory from your version control by adding it to your .gitignore file:

echo "lib" >> .gitignore

4. Import your image renderer from the lib directory:

plugins: [
  [
    '@acid-info/docusaurus-og',
    {
      path: './preview-images', // relative to the build directory
      imageRenderers: {
        'docusaurus-plugin-content-docs': require('./lib/ImageRenderers').docs,
        'docusaurus-plugin-content-pages': require('./lib/ImageRenderers')
          .pages,
        'docusaurus-plugin-content-blog': require('./lib/ImageRenderers').blog,
      },
    },
  ],
]