chore: merge master

lib/mdx.js

@@ -121,6 +121,7 @@ export async function getFileBySlug(type, slug) {
       slug: slug || null,
       fileName: fs.existsSync(mdxPath) ? `${slug}.mdx` : `${slug}.md`,
       ...frontmatter,
+      date: frontmatter.date ? new Date(frontmatter.date).toISOString() : null,
     },
   }
 }
@@ -140,9 +141,13 @@ export async function getAllFilesFrontMatter(folder) {
       return
     }
     const source = fs.readFileSync(file, 'utf8')
-    const { data } = matter(source)
-    if (data.draft !== true) {
-      allFrontMatter.push({ ...data, slug: formatSlug(fileName) })
+    const { data: frontmatter } = matter(source)
+    if (frontmatter.draft !== true) {
+      allFrontMatter.push({
+        ...frontmatter,
+        slug: formatSlug(fileName),
+        date: frontmatter.date ? new Date(frontmatter.date).toISOString() : null,
+      })
     }
   })