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---
'@astrojs/markdown-remark': minor
'astro': minor
---
Adds a `markdown.shikiConfig.langAlias` option that allows [aliasing a non-supported code language to a known language](https://shiki.style/guide/load-lang#custom-language-aliases). This is useful when the language of your code samples is not [a built-in Shiki language](https://shiki.style/languages), but you want your Markdown source to contain an accurate language while also displaying syntax highlighting.
The following example configures Shiki to highlight `cjs` code blocks using the `javascript` syntax highlighter:
```js
import { defineConfig } from 'astro/config';
export default defineConfig({
markdown: {
shikiConfig: {
langAlias: {
cjs: 'javascript',
},
},
},
});
```
Then in your Markdown, you can use the alias as the language for a code block for syntax highlighting:
````md
```cjs
'use strict';
function commonJs() {
return 'I am a commonjs file';
}
```
````
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