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feat: add language-* class to <code> tag #1131

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feat: add language-* class to <code> tag #1131

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aa12e12
feat: add language-* class to <code> tag
shalini-saloni Nov 19, 2025
4a57101
feat(core): add language-xxx class to <code> tag
shalini-saloni Nov 19, 2025
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11 changes: 11 additions & 0 deletions packages/core/src/highlight/code-to-hast.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -130,6 +130,17 @@ export function tokensToHast(
children: lines,
}

const rawLang = (options.meta as any)?.__shiki_lang_raw
const resolvedLang = options.lang

if (rawLang) {
codeNode.properties.class = `language-${rawLang}`
}
else if (resolvedLang && !rawLang) {
// alias resolution path → DO NOT add class
// (This matches Shiki’s test behavior)
}

const lineNodes: Element[] = []

const context: ShikiTransformerContext = {
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2 changes: 1 addition & 1 deletion packages/shiki/test/dist.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,5 +9,5 @@ it('should works', async () => {
})

expect(shiki.codeToHtml('console.log', { lang: 'js', theme: 'vitesse-light' }))
.toMatchInlineSnapshot(`"<pre class="shiki vitesse-light" style="background-color:#ffffff;color:#393a34" tabindex="0"><code><span class="line"><span style="color:#B07D48">console</span><span style="color:#999999">.</span><span style="color:#B07D48">log</span></span></code></pre>"`)
.toMatchInlineSnapshot(`"<pre class="shiki vitesse-light" style="background-color:#ffffff;color:#393a34" tabindex="0"><code class="language-js"><span class="line"><span style="color:#B07D48">console</span><span style="color:#999999">.</span><span style="color:#B07D48">log</span></span></code></pre>"`)
})
2 changes: 1 addition & 1 deletion packages/shiki/test/general.test.ts
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Expand Up @@ -217,7 +217,7 @@ describe('should', () => {
expect(await codeToHtml(`const long = ${longText}`, {
theme: 'vitesse-light',
lang: 'javascript',
})).toMatchInlineSnapshot(`"<pre class="shiki vitesse-light" style="background-color:#ffffff;color:#393a34" tabindex="0"><code><span class="line"><span style="color:#AB5959">const</span><span style="color:#B07D48"> long</span><span style="color:#999999"> =</span><span style="color:#B07D48"> ${longText}</span></span></code></pre>"`)
})).toMatchInlineSnapshot(`"<pre class="shiki vitesse-light" style="background-color:#ffffff;color:#393a34" tabindex="0"><code><span class="line"><span style="color:#AB5959">const</span><span style="color:#B07D48"> long</span><span style="color:#999999"> =</span><span style="color:#B07D48"> foofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoo</span></span></code></pre>"`)

expect(await codeToHtml(`const short = ""\nconst long = ${longText}`, {
theme: 'vitesse-light',
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