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emdash-plugin-highlightjs

v1.0.2

Published

Syntax highlighting for EmDash CMS using Highlight.js — 12 themes, auto dark/light mode, copy button, and a custom code block component for Portable Text.

Downloads

416

Vulnerabilities

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Links

Git

Maintainers

adrianoamalfiadrianoamalfi

Keywords

emdashemdash-pluginhighlightjssyntax-highlightingcode-blocksportable-textcms

Readme

emdash-plugin-highlightjs

CI Security npm version

Syntax highlighting for EmDash CMS using Highlight.js. Features 12 themes, auto dark/light switching, a copy button, and a custom Portable Text code block component.

Features

  • 12 themes — GitHub, Atom One, VS Code, A11Y, Stack Overflow, Tokyo Night, Rose Pine, Panda, Monokai, Dracula, Nord, Night Owl
  • Auto dark/light — Themes with both variants switch via MutationObserver on <html> class
  • Copy button — Optional floating copy button with "Copied!" feedback
  • Portable Text block — Code.astro component with language detection and filename support
  • Admin settings — Theme picker and copy button toggle at /_emdash/admin
  • CSS caching — Theme CSS read once and cached in memory
  • Server-side highlighting — No client JS cost for syntax highlighting

Installation

npm install emdash-plugin-highlightjs

Usage

Register the plugin in astro.config.mjs:

import { highlightjsPlugin } from "emdash-plugin-highlightjs";

export default defineConfig({
  integrations: [
    emdash({
      plugins: [highlightjsPlugin()],
    }),
  ],
});

CSS and copy button are injected automatically on all public pages. Code.astro renders automatically for code blocks in Portable Text content.

How It Works

The plugin injects four fragments via the page:fragments hook:

  1. Light CSS (<style id="hljs-l">) in <head>
  2. Dark CSS (<style id="hljs-d" disabled>) in <head>
  3. Theme toggle script in <head> — MutationObserver on <html>.class
  4. Copy button script at <body:end>

The Code.astro component renders code server-side via highlight.js — no client-side highlighting overhead.

Admin Settings

Navigate to /_emdash/admin → Highlight.js.

| Field | Default | Description | |---|---|---| | Syntax Theme | github | Pick from 12 themes | | Show copy button | true | Toggle floating copy button |

Themes

| Theme | Dark variant | Light variant | |---|---|---| | GitHub | github-dark | github | | Atom One | atom-one-dark | atom-one-light | | VS Code | vs2015 | vs | | A11Y | a11y-dark | a11y-light | | Stack Overflow | stackoverflow-dark | stackoverflow-light | | Tokyo Night | tokyo-night-dark | tokyo-night-light | | Rose Pine | rose-pine | rose-pine-dawn | | Panda | panda-syntax-dark | panda-syntax-light | | Monokai | monokai | — | | Dracula | dracula | — | | Nord | nord | — | | Night Owl | night-owl | — |

Themes with both variants switch automatically with your site's dark/light mode. Single-variant themes use the dark CSS only.

Development

git clone https://github.com/adrianoamalfi/emdash-plugin-highlightjs.git
cd emdash-plugin-highlightjs
npm install
npm run typecheck
npm test

Versioning

This project follows Semantic Versioning. Releases are automated via semantic-release — pushing fix:, feat:, or BREAKING CHANGE: commits to main triggers a release to npm and GitHub.

License

MIT © Adriano Amalfi