improve handling of draft posts

lib/mdx.js

@@ -85,17 +85,15 @@ export async function getFileBySlug(type, slug) {
 export async function getAllFilesFrontMatter(type) {
   const files = fs.readdirSync(path.join(root, 'data', type))
 
-  const allFrontMatter = files.reduce((allPosts, postSlug) => {
-    const source = fs.readFileSync(path.join(root, 'data', type, postSlug), 'utf8')
+  const allFrontMatter = []
+
+  files.forEach((file) => {
+    const source = fs.readFileSync(path.join(root, 'data', type, file), 'utf8')
     const { data } = matter(source)
-    return [
-      {
-        ...data,
-        slug: postSlug.replace(/\.(mdx|md)/, ''),
-      },
-      ...allPosts,
-    ]
-  }, [])
+    if (data.draft !== true) {
+      allFrontMatter.push({ ...data, slug: file.replace(/\.(mdx|md)/, '') })
+    }
+  })
 
   return allFrontMatter.sort((a, b) => dateSortDesc(a.date, b.date))
 }