From ba6a4132bb0847fdf063e3b3f90b7078f81e91b4 Mon Sep 17 00:00:00 2001
From: Daniel Roe <daniel@roe.dev>
Date: Thu, 22 Feb 2024 12:03:57 +0000
Subject: [PATCH] fix(nuxt): handle `undefined` paths in
 `resolveTrailingSlashBehavior`

---
 packages/nuxt/src/app/components/nuxt-link.ts | 20 ++++++++++++-------
 .../nuxt/src/pages/runtime/plugins/router.ts  |  6 ++++--
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/packages/nuxt/src/app/components/nuxt-link.ts b/packages/nuxt/src/app/components/nuxt-link.ts
index c0d8d42417..eed79ef4cd 100644
--- a/packages/nuxt/src/app/components/nuxt-link.ts
+++ b/packages/nuxt/src/app/components/nuxt-link.ts
@@ -88,7 +88,7 @@ export interface NuxtLinkProps extends Omit<RouterLinkProps, 'to'> {
   noPrefetch?: boolean
 }
 
-  /*@__NO_SIDE_EFFECTS__*/
+/*@__NO_SIDE_EFFECTS__*/
 export function defineNuxtLink (options: NuxtLinkOptions) {
   const componentName = options.componentName || 'NuxtLink'
 
@@ -100,7 +100,8 @@ export function defineNuxtLink (options: NuxtLinkOptions) {
 
   function resolveTrailingSlashBehavior (to: string, resolve: Router['resolve']): string
   function resolveTrailingSlashBehavior (to: RouteLocationRaw, resolve: Router['resolve']): Exclude<RouteLocationRaw, string>
-  function resolveTrailingSlashBehavior (to: RouteLocationRaw, resolve: Router['resolve']): RouteLocationRaw | RouteLocation {
+  function resolveTrailingSlashBehavior (to: undefined, resolve: Router['resolve']): undefined
+  function resolveTrailingSlashBehavior (to: RouteLocationRaw | undefined, resolve: Router['resolve']): RouteLocationRaw | RouteLocation | undefined {
     if (!to || (options.trailingSlash !== 'append' && options.trailingSlash !== 'remove')) {
       return to
     }
@@ -109,13 +110,18 @@ export function defineNuxtLink (options: NuxtLinkOptions) {
       return applyTrailingSlashBehavior(to, options.trailingSlash)
     }
 
-    const path = 'path' in to ? to.path : resolve(to).path
+    const path = 'path' in to && to.path !== undefined ? to.path : resolve(to).path
 
-    return {
+    const resolvedPath = {
       ...to,
-      name: undefined, // named routes would otherwise always override trailing slash behavior
       path: applyTrailingSlashBehavior(path, options.trailingSlash)
     }
+
+    if ('name' in resolvedPath) {
+      delete resolvedPath.name
+    }
+
+    return resolvedPath
   }
 
   return defineComponent({
@@ -326,8 +332,8 @@ export function defineNuxtLink (options: NuxtLinkOptions) {
         const href = typeof to.value === 'object'
           ? router.resolve(to.value)?.href ?? null
           : (to.value && !props.external && !isAbsoluteUrl.value)
-              ? resolveTrailingSlashBehavior(joinURL(config.app.baseURL, to.value), router.resolve) as string
-              : to.value || null
+            ? resolveTrailingSlashBehavior(joinURL(config.app.baseURL, to.value), router.resolve) as string
+            : to.value || null
 
         // Resolves `target` value
         const target = props.target || null
diff --git a/packages/nuxt/src/pages/runtime/plugins/router.ts b/packages/nuxt/src/pages/runtime/plugins/router.ts
index 0de9129194..53a62bdcf8 100644
--- a/packages/nuxt/src/pages/runtime/plugins/router.ts
+++ b/packages/nuxt/src/pages/runtime/plugins/router.ts
@@ -237,9 +237,11 @@ const plugin: Plugin<{ router: Router }> = defineNuxtPlugin({
 
     nuxtApp.hooks.hookOnce('app:created', async () => {
       try {
+        const to = router.resolve(initialURL)
+        // #4920, #4982
+        if ('name' in to) { delete to.name }
         await router.replace({
-          ...router.resolve(initialURL),
-          name: undefined, // #4920, #4982
+          ...to,
           force: true
         })
         // reset scroll behavior to initial value