Same route added multiple times in the sitemap.xml

[Skyost]

Describe the bug

Some dynamic routes are added multiple times in my sitemap.xml. Here's an example :

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:news="http://www.google.com/schemas/sitemap-news/0.9"
        xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1"
        xmlns:video="http://www.google.com/schemas/sitemap-video/1.1">
  <url>
    <loc>http://localhost:3000/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/cinquieme/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/cinquieme/enchainement-operations/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/cinquieme/nombres-relatifs/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/cinquieme/parallelogrammes/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/cinquieme/proportionnalite/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/cinquieme/symetries/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/cinquieme/triangles/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/sixieme/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/sixieme/addition-soustraction-multiplication/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/sixieme/distance-cercle/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/sixieme/droites/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/sixieme/longueur-perimetre/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/sixieme/nombres-decimaux/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/sixieme/nombres-entiers/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/troisieme/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/troisieme/arithmetique/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/troisieme/fonctions/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/troisieme/statistiques/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/cours/troisieme/triangles/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/prof/</loc>
  </url>
  <url>
    <loc>http://localhost:3000/prof/</loc>
  </url>
</urlset>

Notice the the second and the third URLs as well as the last two URLs. Some routes are dynamic, here's my pages folder structure :

pages/
├── cours/
│   ├── [level]/
│   │   ├── [slug].vue
│   │   └── index.vue
│   └── index.vue
├── prof/
│   ├── agenda.vue
│   ├── cours.vue
│   ├── index.vue
│   └── tableau-blanc.vue
├── 404.vue
└── index.vue

Reproduction

No response

System Info

System:
    OS: Windows 10 10.0.22621
    CPU: (12) x64 AMD Ryzen 5 5600H with Radeon Graphics
    Memory: 5.97 GB / 15.35 GB
Binaries:
    Node: 16.15.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.19 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 9.1.2 - C:\Program Files\nodejs\npm.CMD
Browsers:
    Edge: Spartan (44.22621.963.0), Chromium (108.0.1462.54)
    Internet Explorer: 11.0.22621.1

### Used Package Manager

npm

### Validations

- [X] Follow our [Code of Conduct](https://github.com/harlan-zw/.github/blob/main/CODE_OF_CONDUCT.md)
- [X] Read the [Contributing Guide](https://github.com/antfu/contribute).
- [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
- [X] Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
- [X] The provided reproduction is a [minimal reproducible](https://stackoverflow.com/help/minimal-reproducible-example) of the bug.

[harlan-zw]

Hey @Skyost

Thanks for the issue. I've pushed up a workaround to avoid duplicate entries, available in v0.5.8.

You may have run into this because you have links to the same routes which have both trailing and non-trailing slashes. You may want to check your links as you'll be pre-rendering both currently, as far as I understand it. If you use https://github.com/harlan-zw/nuxt-link-checker, it will warn you.

[Skyost]

Hey @harlan-zw,

Thanks for the tip and for the fix ! In fact, I saw your package before, I just wasn't sure whether I needed it. I will definitely give it a try.