From ed611260f3c2d7427bce012e0cd0d478edeb5eec Mon Sep 17 00:00:00 2001
From: Chase McCoy <chasem000@gmail.com>
Date: Fri, 12 Apr 2019 11:25:32 -0500
Subject: [PATCH 1/2] Use a Set for shortcode names

Fixes #518
---
 packages/mdx/mdx-hast-to-jsx.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/mdx/mdx-hast-to-jsx.js b/packages/mdx/mdx-hast-to-jsx.js
index 265308adb..df4839cde 100644
--- a/packages/mdx/mdx-hast-to-jsx.js
+++ b/packages/mdx/mdx-hast-to-jsx.js
@@ -174,7 +174,7 @@ MDXContent.isMDXComponent = true`
   return <div {...props}/>
 };
 ` +
-      jsxNames
+      new Set(jsxNames)
         .filter(name => !importExportNames.includes(name))
         .map(name => {
           return `const ${name} = makeShortcode("${name}");`

From b4fdbab9758e6380113128ab3c0181bbb33891b3 Mon Sep 17 00:00:00 2001
From: Chase McCoy <chasem000@gmail.com>
Date: Fri, 12 Apr 2019 11:30:57 -0500
Subject: [PATCH 2/2] Use a Set for shortcode names

---
 packages/mdx/mdx-hast-to-jsx.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/mdx/mdx-hast-to-jsx.js b/packages/mdx/mdx-hast-to-jsx.js
index df4839cde..6e1458b64 100644
--- a/packages/mdx/mdx-hast-to-jsx.js
+++ b/packages/mdx/mdx-hast-to-jsx.js
@@ -174,7 +174,7 @@ MDXContent.isMDXComponent = true`
   return <div {...props}/>
 };
 ` +
-      new Set(jsxNames)
+      [...new Set(jsxNames)]
         .filter(name => !importExportNames.includes(name))
         .map(name => {
           return `const ${name} = makeShortcode("${name}");`