rehype-highlight

Syntax highlighting for rehype.

Installation

npm:

npm install rehype-highlight

Usage

Say example.html looks as follows:

<h1>Hello World!</h1>

<pre><code class="language-js">var name = "World";
console.warn("Hello, " + name + "!")</code></pre>

...and example.js like this:

var vfile = require('to-vfile')
var report = require('vfile-reporter')
var rehype = require('rehype')
var highlight = require('rehype-highlight')

rehype()
  .data('settings', {fragment: true})
  .use(highlight)
  .process(vfile.readSync('example.html'), function(err, file) {
    console.error(report(err || file))
    console.log(String(file))
  })

Now, running node example yields:

example.html: no issues found
<h1>Hello World!</h1>

<pre><code class="hljs language-js"><span class="hljs-keyword">var</span> name = <span class="hljs-string">"World"</span>;
<span class="hljs-built_in">console</span>.warn(<span class="hljs-string">"Hello, "</span> + name + <span class="hljs-string">"!"</span>)</code></pre>

API

rehype().use(highlight[, options])

Syntax highlight pre > code. Uses lowlight under the hood, which is a virtual version of highlight.js.

Configure the language by using a lang-js or language-js class. Ignore code with a no-highlight or nohighlight class. Will auto-detect the syntax language otherwise.

options

options.prefix

string, default: 'hljs-' — Prefix to use before classes.

options.subset

boolean or Array.<string>, default: all languages — Scope of languages to check when auto-detecting. Pass false to not highlight code without language classes.

options.ignoreMissing

boolean, default: false. By default, unregistered syntaxes throw an error when they are used. Pass true to swallow those errors and thus ignore code with unknown code languages.

options.plainText

Array.<string>, default: []. Pass any languages you would like to be kept as plain-text instead of getting highlighted.

options.aliases

Object<string | Array.<string>>, default: {}. Register more aliases. Passed to lowlight.registerAlias.

Contribute

See contributing.md in rehypejs/rehype for ways to get started.

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License

MIT © Titus Wormer