flatMap polyfill

karesztrk · Apr 12, 2021 · a148e85 · a148e85
1 parent d074c53
commit a148e85
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Showing 2 changed files with 17 additions and 25 deletions.
diff --git a/src/lib/tags.ts b/src/lib/tags.ts
@@ -7,26 +7,25 @@ export type TagContent = {
 
 export function listTags(limit?: number): TagContent[] {
   const postContent = fetchPostContent();
-  console.log('Received tags: ');
-  console.log(postContent.map((content) => content.tags));
-  const allTags =
-    postContent && Array.isArray(postContent) && postContent.map
-      ? Array.from(
-          new Set<string>(
-            postContent
-              .map((content) => content.tags)
-              .flat()
-              .filter((t) => t)
-              .map((t) => t.toLowerCase()),
-          ),
-        )
-      : [];
-  const tags = allTags.map((tag) => ({
+  if (!postContent || !Array.isArray(postContent)) {
+    return [];
+  }
+
+  const tagSet = new Set<string>(
+    // flatMap() polyfill
+    [].concat(
+      ...postContent.map((content) =>
+        content.tags.filter((t) => t).map((t) => t.toLowerCase()),
+      ),
+    ),
+  );
+  const tags = Array.from(tagSet).map((tag) => ({
     name: tag,
     slug: tag,
   }));
-  if (!limit) {
-    return tags;
+
+  if (limit) {
+    return tags.slice(0, limit);
   }
-  return tags.slice(0, limit);
+  return tags;
 }
diff --git a/src/pages/posts/tags/[[...slug]].tsx b/src/pages/posts/tags/[[...slug]].tsx
@@ -67,13 +67,6 @@ export const getStaticProps: GetStaticProps = async ({ params }) => {
 };
 
 export const getStaticPaths: GetStaticPaths = async () => {
-  const tags = listTags();
-  if (!tags || !Array.isArray(tags) || !tags.flatMap) {
-    return {
-      paths: [],
-      fallback: false,
-    };
-  }
   const paths = listTags().flatMap((tag) => {
     const pages = Math.ceil(countPosts(tag.slug) / config.posts_per_page);
     return Array.from(Array(pages).keys()).map((page) =>