Sitemap does not contain links to all pages

Describe the bug My project has 5 pages. Generated sitemap has only 2.

To Reproduce I am creating new sitemap using next-sitemap --config next-sitemap.config.js

Expected behavior I expected sitemap to contain links to all 5 pages.

Additional context next-sitemap.config.js:

module.exports = {
	siteUrl: process.env.SITE_URL || 'https://apps.is',
	generateRobotsTxt: true,
}

The generated sitemap:

<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:mobile="http://www.google.com/schemas/sitemap-mobile/1.0" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1" xmlns:video="http://www.google.com/schemas/sitemap-video/1.1">
<url><loc>https://apps.is</loc><changefreq>daily</changefreq><priority>0.7</priority><lastmod>2021-05-17T15:46:41.100Z</lastmod></url>
<url><loc>https://apps.is/our-way</loc><changefreq>daily</changefreq><priority>0.7</priority><lastmod>2021-05-17T15:46:41.100Z</lastmod></url>
</urlset>```

[LiangYingC]

Thanks @abzeede and @sanderfish answer to solve this problem.

Let me try to explain more after tracing source code by myself.

If we run next-sitemap of script, it will run /bin/next-sitemap file and load cli.

So, we can see what happen at /src/cli.ts and focus on

// Get runtime paths
const runtimePaths = getRuntimePaths(config)

when we read more detail about getRuntimePaths at /src/path/index.ts, we can realize it return

{
    BUILD_MANIFEST: getPath(config.sourceDir!, 'build-manifest.json'),
    PRERENDER_MANIFEST: getPath(config.sourceDir!, 'prerender-manifest.json'),
    EXPORT_MARKER: getPath(config.sourceDir!, 'export-marker.json'),
    ......
  }

we can get file paths about build-manifest.json, prerender-manifest.json and export-marker.json that all files will be create after next build and will be used to create url set at /src/cli.ts.

To conclude, cause next-sitemap need to use files will be create after next build to create sitemap, so we need to run next build before run the next-sitemap script.

Hope to help understanding why need to do

{
  "build": "next build && next-sitemap"
}

not

{
  "build": "next-sitemap && next build"
}

Thanks.

[sanderfish]

Had the same issue. Chaining the build script instead of using postbuild works for me:

{
  "build": "next build && next-sitemap"
}