fix: link tag comment with no url (#94)

.changeset/puny-pets-refuse.md

@@ -0,0 +1,5 @@
+---
+'starlight-typedoc': patch
+---
+
+Fixes a potential error when rendering link tags in comments that reference reflections without URLs.

fixtures/basics/src/types.ts

@@ -11,3 +11,11 @@ export interface Thing {
 }
 
 export type Things = Thing[]
+
+export type ThingWithBazAndQuux = Thing & {
+  baz: string
+  /**
+   * @see {@link ThingWithBazAndQuux.baz}
+   */
+  quux: number[]
+}

packages/starlight-typedoc/libs/theme.ts

@@ -91,6 +91,11 @@ class StarlightTypeDocThemeRenderContext extends MarkdownThemeContext {
       (part.tag === '@link' || part.tag === '@linkcode' || part.tag === '@linkplain') &&
       part.target instanceof Reflection
     ) {
+      if (!this.router.hasUrl(part.target)) {
+        const { target, ...rest } = part
+        return rest
+      }
+
       return {
         ...part,
         target: this.urlTo(part.target),

packages/starlight-typedoc/tests/e2e/basics/sidebar.test.ts

@@ -58,7 +58,7 @@ test('should generate the proper items for for a single entry point', async ({ d
     },
     {
       label: 'Type Aliases',
-      items: [{ name: 'Things' }],
+      items: [{ name: 'Things' }, { name: 'ThingWithBazAndQuux' }],
       collapsed: true,
     },
     {