执行npm run build报错，已添加prerender=true至+layout.svelte仍无效

我执行npm run build生成可部署到AWS实例的/build文件夹时，遇到如下报错：

Run npm run preview to preview your production build locally.

> Using @sveltejs/adapter-static
  @sveltejs/adapter-static: all routes must be fully prerenderable, but found the following routes that are dynamic:
    - src/routes/
  
  You have the following options:
    - set the `fallback` option — see https://github.com/sveltejs/kit/tree/master/packages/adapter-static#spa-mode for more info.
    - add `export const prerender = true` to your root `+layout.js/.ts` or `+layout.server.js/.ts` file. This will try to prerender all pages.
    - add `export const prerender = true` to any `+server.js/ts` files that are not fetched by page `load` functions.
  
    - pass `strict: false` to `adapter-static` to ignore this error. Only do this if you are sure you don't need the routes in question in your final app, as they will be unavailable. See https://github.com/sveltejs/kit/tree/master/packages/adapter-static#strict for more info.
  
  If this doesn't help, you may need to use a different adapter. @sveltejs/adapter-static can only be used for sites that don't need a server for dynamic rendering, and can run on just a static file server.
  See https://kit.svelte.dev/docs/page-options#prerender for more details
error during build:
Error: Encountered dynamic routes

报错提示需将export const prerender = true添加至根目录的+layout.js/.ts或+layout.server.js/.ts文件，但我将其添加到了+layout.svelte中：

<script>
  import '../app.css'
  export const prerender = true
</script>

<slot />

之后我又尝试了帖子中的写法：

<script context="module">
  export const prerender=true; // +layout.svelte
</script>

但两种方式都无法解决问题，请问这是为什么？

原因及解决方案 #

• 核心问题：页面配置项（比如prerender）不能写在+layout.svelte里，SvelteKit的路由系统只会从+layout.js/ts或+layout.server.js/ts这类专门的配置文件读取全局路由配置。
• 正确操作步骤：
  1. 在src/routes/目录下创建+layout.js文件（如果已存在则直接编辑）
  2. 在文件中添加以下代码：

     export const prerender = true;
     

• 为什么之前的写法无效：
  • 普通<script>标签里的导出是组件内部变量，不属于路由级别的配置项；
  • 带context="module"的<script>是组件模块级导出，仅作用于组件自身逻辑，不会被SvelteKit的路由解析系统识别为全局路由配置。
• 其他可选方案：
  • 若你的站点需要SPA模式，可在adapter-static的配置中设置fallback: 'index.html'；
  • 确保所有独立的+server.js/ts文件都添加export const prerender = true（如果这些接口不需要动态服务支持）；
  • 检查是否存在未处理的动态路由（如带参数的[slug]路由），这类路由要么配置预渲染规则，要么更换为支持动态渲染的adapter。

内容的提问来源于stack exchange，提问作者plutownium