nextjs config_error ai_generated true

Error: Layout segment config 'X' is not allowed. Use generateMetadata or generateStaticParams instead.

ID: nextjs/layout-segment-config-export

Also available as: JSON · Markdown · 中文

90%Fix Rate

85%Confidence

1Evidence

2023-10-15First Seen

Version Compatibility

Version	Status	Introduced	Deprecated	Notes
[email protected]	active	—	—	—
[email protected]	active	—	—	—
[email protected]	active	—	—	—

Root Cause

In Next.js app directory, layout segment configs like 'layout' or 'template' cannot be exported directly; they must be replaced with the correct data-fetching or metadata APIs.

generic

中文

在 Next.js app 目录中，布局段配置（如 'layout' 或 'template'）不能直接导出；必须替换为正确的数据获取或元数据 API。

Official Documentation

https://nextjs.org/docs/app/api-reference/functions/generate-metadata

Workarounds

90% success Replace the layout segment config with generateMetadata. For example, if you exported 'metadata', change to: export async function generateMetadata({ params }) { const data = await fetchData(params.slug); return { title: data.title }; }
```
Replace the layout segment config with generateMetadata. For example, if you exported 'metadata', change to:

export async function generateMetadata({ params }) {
  const data = await fetchData(params.slug);
  return { title: data.title };
}
```
85% success If the config was for static generation, use generateStaticParams: export async function generateStaticParams() { const posts = await fetchPosts(); return posts.map(post => ({ slug: post.slug })); }
```
If the config was for static generation, use generateStaticParams:

export async function generateStaticParams() {
  const posts = await fetchPosts();
  return posts.map(post => ({ slug: post.slug }));
}
```
75% success For dynamic segments, ensure the layout has a default.tsx or loading.tsx to handle fallback states.
```
For dynamic segments, ensure the layout has a default.tsx or loading.tsx to handle fallback states.
```

中文步骤

将布局段配置替换为 generateMetadata。例如，如果你导出了 'metadata'，改为：

export async function generateMetadata({ params }) {
  const data = await fetchData(params.slug);
  return { title: data.title };
}

如果配置用于静态生成，使用 generateStaticParams：

export async function generateStaticParams() {
  const posts = await fetchPosts();
  return posts.map(post => ({ slug: post.slug }));
}

对于动态段，确保布局有 default.tsx 或 loading.tsx 来处理回退状态。

Dead Ends

Common approaches that don't work:

70% fail
The layout still needs to define metadata or static params; removing the export breaks the page functionality.
90% fail
Next.js only recognizes specific exports; arbitrary names are ignored and cause build errors.
80% fail
Client components cannot use metadata or static params; this creates a different error.