From b71867348d51dd5fb5fe671c9ecd2b5e95a5c72e Mon Sep 17 00:00:00 2001
From: Titus Wormer <tituswormer@gmail.com>
Date: Sun, 3 Oct 2021 17:29:48 +0200
Subject: [PATCH] Fix support for explicit nullish `processor`

Closes GH-21.
---
 index.js |  4 ++--
 test.js  | 11 +++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index 62f029c..444a59c 100644
--- a/index.js
+++ b/index.js
@@ -26,12 +26,12 @@ import {toHast} from 'mdast-util-to-hast'
  *   Options passed to `mdast-util-to-hast`.
  */
 const remarkRehype =
-  /** @type {(import('unified').Plugin<[Processor, Options?]|[Options]|[], MdastRoot>)} */
+  /** @type {(import('unified').Plugin<[Processor, Options?]|[null|undefined, Options?]|[Options]|[], MdastRoot>)} */
   (
     function (destination, options) {
       return destination && 'run' in destination
         ? bridge(destination, options)
-        : mutate(destination)
+        : mutate(destination || options)
     }
   )
 
diff --git a/test.js b/test.js
index e9e1a65..260a094 100644
--- a/test.js
+++ b/test.js
@@ -28,6 +28,17 @@ test('remarkRehype', (t) => {
     'should mutate with options'
   )
 
+  t.equal(
+    unified()
+      .use(remarkParse)
+      .use(remarkRehype, null, {allowDangerousHtml: true})
+      .use(rehypeStringify, {allowDangerousHtml: true})
+      .processSync('## Hello, <i>world</i>! ##')
+      .toString(),
+    '<h2>Hello, <i>world</i>!</h2>',
+    'should mutate with `processor: null` and options'
+  )
+
   t.equal(
     unified()
       .use(remarkParse)