So siehts ganz gut aus !

node_modules/pug/test/output/mixin-at-end-of-file.js

@@ -0,0 +1,15 @@
+function template(locals) {
+    var pug_html = "", pug_mixins = {}, pug_interp;
+    pug_mixins["slide"] = pug_interp = function() {
+        var block = this && this.block, attributes = this && this.attributes || {};
+        pug_html = pug_html + '<section class="slide">';
+        block && block();
+        pug_html = pug_html + "</section>";
+    };
+    pug_mixins["slide"].call({
+        block: function() {
+            pug_html = pug_html + "<p>some awesome content</p>";
+        }
+    });
+    return pug_html;
+}