remark-alerts

remark plugin to support GitHub-style alerts.

This project is a fork of the antfu/markdown-it-github-alerts project.

Note

Highlights information that users should take into account, even when skimming.

Tip

Optional information to help a user be more successful.

Important

Crucial information necessary for users to succeed.

Warning

Critical content demanding immediate user attention due to potential risks.

Caution

Negative potential consequences of an action.

> [!NOTE]
> Highlights information that users should take into account, even when skimming.

> [!TIP]
> Optional information to help a user be more successful.

> [!IMPORTANT]
> Crucial information necessary for users to succeed.

> [!WARNING]
> Critical content demanding immediate user attention due to potential risks.

> [!CAUTION]
> Negative potential consequences of an action.

Usage

npm i remark-alerts

import { unified } from "unified";
import remarkHtml from "remark-html";
import remarkParse from "remark-parse";
import remarkAlerts from 'remark-alerts'

const content = `
# Hello

> [!NOTE]
> Highlights information that users should take into account, even when skimming.

> [!TIP]
> Optional information to help a user be more successful.

> [!IMPORTANT]
> Crucial information necessary for users to succeed.

> [!WARNING]
> Critical content demanding immediate user attention due to potential risks.

> [!CAUTION]
> Negative potential consequences of an action.

`

const parsedContent = await unified()
  .use(remarkParse)
  .use(remarkAlerts)
  .use(remarkHtml, { sanitize: false })
  .process(content);

console.log(parsedContent)

For the options available, please refer to the jsdoc.

Functionality

This plugin transforms the following markdown:

> [!NOTE]
> Highlights information that users should take into account, even when skimming.

to the following HTML:

<div class="markdown-alert markdown-alert-note">
  <p class="markdown-alert-title" dir="auto"><!-- svg icon-->Note</p><p>
  Highlights information that users should take into account, even when skimming.</p>
</div>

Which is compatible with the GitHub's output.

Styling

You can write your custom styles for your alerts.

We also provide some CSS extracted from GitHub's styles for you to use.

import 'remark-alerts/styles/github-colors-light.css'
import 'remark-alerts/styles/github-colors-dark-media.css'
import 'remark-alerts/styles/github-base.css'

You might change github-colors-dark-media.css to github-colors-dark-class.css if you are using class-based (.dark) dark mode.

Refer to the source code for more details.

Customization

In order to also support Obsidian callouts syntax it is possible to allow any type of markers with the following setting:

unified().use(remarkAlerts, { markers: "*" })

Alternative titles are also supported, by appending it to the marker like this:

> [!note] Nota bene
> The custom title will replace the regular title.

License

MIT