From b87094e33d111af948d2726f5c1a0fecad94fbca Mon Sep 17 00:00:00 2001
From: David Anson <david@dlaa.me>
Date: Sun, 8 Mar 2020 19:49:52 -0700
Subject: [PATCH] Update MD018/no-missing-space-atx to ignore Keycap Number
 Sign emoji at start of line (fixes #257).

---
 lib/md018.js           |  5 ++++-
 test/emoji-headings.md | 23 +++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 test/emoji-headings.md

diff --git a/lib/md018.js b/lib/md018.js
index 5aec9053..bd8beafc 100644
--- a/lib/md018.js
+++ b/lib/md018.js
@@ -11,7 +11,10 @@ module.exports = {
   "tags": [ "headings", "headers", "atx", "spaces" ],
   "function": function MD018(params, onError) {
     forEachLine(lineMetadata(), (line, lineIndex, inCode) => {
-      if (!inCode && /^#+[^#\s]/.test(line) && !/#\s*$/.test(line)) {
+      if (!inCode &&
+        /^#+[^#\s]/.test(line) &&
+        !/#\s*$/.test(line) &&
+        !line.startsWith("#️⃣")) {
         const hashCount = /^#+/.exec(line)[0].length;
         addErrorContext(
           onError,
diff --git a/test/emoji-headings.md b/test/emoji-headings.md
new file mode 100644
index 00000000..f0a3af21
--- /dev/null
+++ b/test/emoji-headings.md
@@ -0,0 +1,23 @@
+# Emoji Headings
+
+#️⃣ Keycap Number Sign
+
+<https://emojipedia.org/keycap-number-sign/>
+
+# #️⃣ Keycap Number Sign
+
+Text
+
+##️⃣ Keycap Number Sign {MD018}
+
+Text
+
+# Keycap Number Sign #️⃣
+
+Text
+
+# Keycap Number Sign#️⃣
+
+Text
+
+<!-- markdownlint-disable-file MD025 -->