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Server-side GitHub Flavored Markdown rendering for Deno

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# deno-gfm

Server-side GitHub Flavored Markdown rendering for Deno, including GitHub style
CSS, syntax highlighting, and HTML sanitization.

## Usage

First install the package with the command:

```sh
deno add jsr:@deno/gfm
```

```js
import { CSS, render } from "@deno/gfm";

const markdown = `
# Hello, world!

| Type | Value |
| ---- | ----- |
| x    | 42    |

\`\`\`js
console.log("Hello, world!");
\`\`\`
`;

const body = render(markdown, {
  baseUrl: "https://example.com",
});

### Styling

The GitHub CSS styles (https://primer.style) are used. There are two themes
available: light and dark.

There are three data attributes that can be used to control the theme:

- `data-color-mode`: `light` or `dark` or `auto`.
- `data-light-theme`: the name of the light theme (`light` or `dark`).
- `data-dark-theme`: the name of the dark theme (`light` or `dark`).

For example, if you want to use the dark theme only, set the following:

```html
<div data-color-mode="dark" data-dark-theme="dark" class="markdown-body">
  ... markdown body here ...
</div>
```

If you want to use the light or dark theme depending on the user's browser
preference, set the following:

```html
<div
  data-color-mode="auto"
  data-light-theme="light"
  data-dark-theme="dark"
  class="markdown-body"
>
  ... markdown body here ...
</div>
```

Also see the example application in the `example/` directory.

## Extensibility

By default syntax highlighting for JavaScript, Markdown, and HTML is included.
You can include more languages importing them:

```js
import { CSS, render } from "@deno/gfm";

// Add support for TypeScript, Bash, and Rust.
import "npm:prismjs@1.29.0/components/prism-typescript.js";
import "npm:prismjs@1.29.0/components/prism-bash.js";
import "npm:prismjs@1.29.0/components/prism-rust.js";
```

A full list of supported languages is available here:
https://unpkg.com/browse/prismjs@1.29.0/components/

## Inline rendering

By default, all rendering is in blocks. There are cases where one would like to
render some inline markdown, and this is achievable using the `inline` setting:

```ts
import { render } from "@deno/gfm";

const markdown = "My [Deno](https://deno.land) Blog";
const header = render(markdown, { inline: true });
console.log(header);
```

## Math rendering

By default math rendering is disabled. To enable it, you must include the
additional CSS and enable the `allowMath` setting:

```ts
import { CSS, KATEX_CSS, render } from "jsr:@deno/gfm";

const markdown = `
Block math:

$$ y = x^2 $$

Inline math: $y = x^2$
`;

const body = render(markdown, {
  allowMath: true,
});

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