This extension allows you to use GitHub permalink to code snippet in your markdown file, and it'll render just like how GitHub rendenrs code snippet from its repository, as long as

1. You provide a GitHub access token.
2. The token has access right to the repository your permalink points to.

Here we'll walk through how to try out this extension from scratch, this assumes you have the following:

• installed node and npm
• have a GitHub access token ready (since rendering the permalink requires fetching from GitHub API)

First we create a new directory, initialize npm and download marked and this extension (for npm init just hit defaults for everything it asks):

mkdir test
npm init -y
npm install marked marked-gh-permalink

Then we create a test file index.mjs with the following content:

import { marked } from 'marked';
import markedGhPermalink from 'marked-gh-permalink';

// Set up marked
const ghToken = process.env.GH_PERMALINK_API_TOKEN
marked.setOptions(marked.getDefaults());
marked.use(markedGhPermalink(ghToken));

// Example markdown text with permalink to GitHub code snippet
const input = `
This is how \`marked\` renders a code block:
https://github.com/markedjs/marked/blob/91ee15b2d43da92f751165c88d1a78ebc3b99114/src/Renderer.ts#L17-L33
`

// Convert to html and print it out.
const result = await marked(input);
console.log(result);

Finally we run it with our github token:

GH_PERMALINK_API_TOKEN=<fill-in-your-token> node index.mjs

Finally, you'll see the HTML printed in your terminal. If you copy and paste that to html code editer, you'll see this:

Note that it doesn't have syntax highlighting, that's because we use highlight.js for that and it requires importing CSS separately. So if we add the following line to the beginning of the HTML we had:

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/github.min.css">

We get the github-style syntax highlighting, as shown below: