fix: only add heading to TOC if text is defined

Author: metonym

src/preprocessReadme.js

@@ -98,26 +98,31 @@ export function preprocessReadme(opts) {
             if (id === "table-of-contents") return;
 
             const text = node.children[0].raw;
-            if (prev === "h3") {
-              headings.push(`</ul><li><a href="#${id}">${text}</a></li>`);
-            } else {
-              headings.push(`<li><a href="#${id}">${text}</a></li>`);
-            }
 
-            prev = "h2";
+            if (text !== undefined) {
+              if (prev === "h3") {
+                headings.push(`</ul><li><a href="#${id}">${text}</a></li>`);
+              } else {
+                headings.push(`<li><a href="#${id}">${text}</a></li>`);
+              }
+
+              prev = "h2";
+            }
           }
 
           if (node.type === "Element" && node.name === "h3") {
             const id = node.attributes.find((attr) => attr.name === "id").value[0].raw;
             const text = node.children[0].raw;
 
-            if (prev === "h2") {
-              headings.push(`<ul><li><a href="#${id}">${text}</a></li>`);
-            } else {
-              headings.push(`<li><a href="#${id}">${text}</a></li>`);
-            }
+            if (text !== undefined) {
+              if (prev === "h2") {
+                headings.push(`<ul><li><a href="#${id}">${text}</a></li>`);
+              } else {
+                headings.push(`<li><a href="#${id}">${text}</a></li>`);
+              }
 
-            prev = "h3";
+              prev = "h3";
+            }
           }
 
           if (node.type === "Attribute" && node.name === "data-svelte") {

test/README.md

@@ -48,6 +48,7 @@ Check out my cool component library.
 localStorage.getItem("custom-theme-key");
 ```
 
+## [rollup.config.js](rollup.config.js)
 
 [package.json](package.json)