Get rid of the _11ty folder—we don’t need it.

.eleventy.js

@@ -33,7 +33,34 @@ module.exports = function(eleventyConfig) {
     return array.slice(0, n);
   });
 
-  eleventyConfig.addCollection("tagList", require("./_11ty/getTagList"));
+  eleventyConfig.addCollection("tagList", function(collection) {
+    let tagSet = new Set();
+    collection.getAll().forEach(function(item) {
+      if( "tags" in item.data ) {
+        let tags = item.data.tags;
+
+        tags = tags.filter(function(item) {
+          switch(item) {
+            // this list should match the `filter` list in tags.njk
+            case "all":
+            case "nav":
+            case "post":
+            case "posts":
+              return false;
+          }
+
+          return true;
+        });
+
+        for (const tag of tags) {
+          tagSet.add(tag);
+        }
+      }
+    });
+
+    // returning an array in addCollection works in Eleventy 0.5.3
+    return [...tagSet];
+  });
 
   eleventyConfig.addPassthroughCopy("img");
   eleventyConfig.addPassthroughCopy("css");

.eleventyignore

@@ -1,2 +1 @@
 README.md
-_11ty/

_includes/layouts/base.njk

@@ -23,6 +23,8 @@
     </header>
 
     <main{% if templateClass %} class="{{ templateClass }}"{% endif %}>
+
+      <!-- Delete this message -->
       <div class="warning">
         <ol>
           <li>Edit the <code>_data/metadata.json</code> with your blog’s information.</li>
@@ -31,6 +33,7 @@
         </ol>
         <p><em>This is an <a href="https://www.11ty.dev/">Eleventy project</a> created from the <a href="https://github.com/11ty/eleventy-base-blog"><code>eleventy-base-blog</code> repo</a>.</em></p>
       </div>
+      <!-- Stop deleting -->
 
       {{ content | safe }}
     </main>