From d94b78e6bfd20b061b1856a70faedd16a7b4d17a Mon Sep 17 00:00:00 2001
From: David Anson <david@dlaa.me>
Date: Tue, 22 Oct 2024 22:03:05 -0700
Subject: [PATCH] Refactor getEvents slightly to avoid modifying the
 MicromarkParseOptions object.

---
 demo/markdownlint-browser.js | 12 ++++++------
 helpers/micromark-parse.cjs  | 12 ++++++------
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/demo/markdownlint-browser.js b/demo/markdownlint-browser.js
index e41416622..6d810f7eb 100644
--- a/demo/markdownlint-browser.js
+++ b/demo/markdownlint-browser.js
@@ -1023,15 +1023,15 @@ function getEvents(
   markdown,
   micromarkParseOptions = {}
 ) {
-  // Customize options object to add useful extensions
-  micromarkParseOptions.extensions = micromarkParseOptions.extensions || [];
-  micromarkParseOptions.extensions.push(
+  // Customize extensions list to add useful extensions
+  const extensions = [
     micromark.directive(),
     micromark.gfmAutolinkLiteral(),
     micromark.gfmFootnote(),
     micromark.gfmTable(),
-    micromark.math()
-  );
+    micromark.math(),
+    ...(micromarkParseOptions.extensions || [])
+  ];
 
   // // Shim labelEnd to identify undefined link labels
   /** @type {Event[][]} */
@@ -1153,7 +1153,7 @@ function getEvents(
     // Use micromark to parse document into Events
     const encoding = undefined;
     const eol = true;
-    const parseContext = micromark.parse(micromarkParseOptions);
+    const parseContext = micromark.parse({ ...micromarkParseOptions, extensions });
     const chunks = micromark.preprocess()(markdown, encoding, eol);
     const events = micromark.postprocess(parseContext.document().write(chunks));
 
diff --git a/helpers/micromark-parse.cjs b/helpers/micromark-parse.cjs
index 62ce20369..0ca3373ed 100644
--- a/helpers/micromark-parse.cjs
+++ b/helpers/micromark-parse.cjs
@@ -32,15 +32,15 @@ function getEvents(
   markdown,
   micromarkParseOptions = {}
 ) {
-  // Customize options object to add useful extensions
-  micromarkParseOptions.extensions = micromarkParseOptions.extensions || [];
-  micromarkParseOptions.extensions.push(
+  // Customize extensions list to add useful extensions
+  const extensions = [
     micromark.directive(),
     micromark.gfmAutolinkLiteral(),
     micromark.gfmFootnote(),
     micromark.gfmTable(),
-    micromark.math()
-  );
+    micromark.math(),
+    ...(micromarkParseOptions.extensions || [])
+  ];
 
   // // Shim labelEnd to identify undefined link labels
   /** @type {Event[][]} */
@@ -162,7 +162,7 @@ function getEvents(
     // Use micromark to parse document into Events
     const encoding = undefined;
     const eol = true;
-    const parseContext = micromark.parse(micromarkParseOptions);
+    const parseContext = micromark.parse({ ...micromarkParseOptions, extensions });
     const chunks = micromark.preprocess()(markdown, encoding, eol);
     const events = micromark.postprocess(parseContext.document().write(chunks));