Add plainText option

lib/index.js

@@ -13,6 +13,8 @@ const listFormat = new Intl.ListFormat('en', {type: 'disjunction'})
 
 /** @type {Readonly<Options>} */
 const emptyOptions = {}
+/** @type {ReadonlyArray<never>} */
+const emptyPlainText = []
 
 const prefix = 'language-'
 
@@ -30,6 +32,7 @@ const max = 4
 export default function rehypeStarryNight(options) {
   const settings = options || emptyOptions
   const grammars = settings.grammars || common
+  const plainText = settings.plainText || emptyPlainText
   const starryNightPromise = createStarryNight(grammars, settings)
   const names = grammars.flatMap(function (d) {
     return d.names
@@ -67,7 +70,9 @@ export default function rehypeStarryNight(options) {
           const language = languageClass.slice(prefix.length)
           const scope = starryNight.flagToScope(language)
 
-          if (scope) {
+          if (plainText.includes(language)) {
+            // Empty.
+          } else if (scope) {
             const fragment = starryNight.highlight(toString(node), scope)
             node.children = /** @type {Array<ElementContent>} */ (
               fragment.children

lib/types.d.ts

@@ -13,4 +13,8 @@ export interface Options extends StarryNightOptions {
    * Grammars to support (default: `common`).
    */
   grammars?: ReadonlyArray<Grammar> | null | undefined
+  /**
+   * List of language names to not highlight (default: `[]`).
+   */
+  plainText?: ReadonlyArray<string> | null | undefined
 }

readme.md

@@ -135,6 +135,8 @@ Configuration for `rehype-starry-night`.
 
 * `grammars?` (`ReadonlyArray<Grammar> | null | undefined`)
   — grammars to support (default: `common`)
+* `plainText?` (`ReadonlyArray<string> | null | undefined`)
+  — list of language names to not highlight (default: `[]`)
 
 ### `rehypeStarryNight(options) (default)`
 

test/index.js

@@ -57,6 +57,22 @@ alert(hi)
       '1:6-1:47: Unexpected unknown language `hypescript` defined with `language-` class, expected a known name; did you mean `typescript` or `cakescript`'
     ])
   })
+
+  await t.test('should ignore languages in `plainText`', async function () {
+    const file = await unified()
+      .use(rehypeParse, {fragment: true})
+      .use(rehypeStarryNight, {plainText: ['hypescript', 'javascript']})
+      .use(rehypeStringify)
+      .process(
+        '<pre><code class="language-javascript">"hi"</code></pre>\n<pre><code class="language-hypescript"></code></pre>'
+      )
+
+    assert.equal(
+      String(file),
+      '<pre><code class="language-javascript">"hi"</code></pre>\n<pre><code class="language-hypescript"></code></pre>'
+    )
+    assert.deepEqual(file.messages.map(String), [])
+  })
 })
 
 test('fixtures', async function (t) {