我已经开发了一个JS脚本，当通过URL访问时，它可以作为sitemap.xml工作（例如：mydomain.com/sitemap.xml），它将列出我的项目的页面。当在开发（yarn dev）上运行时，它工作正常，当在我的PC（yarn build & yarn start）上构建和启动后运行时也工作正常。问题是在Vercel上它不工作，错误是：

[GET] /sitemap.xml
19:39:16:85
Function Status:
None
Edge Status:
500
Duration:
146.30 ms
Init Duration:
446.50 ms
Memory Used:
80 MB
info  - Loaded env from /var/task/.env.production
info  - Loaded env from /var/task/.env
2021-11-18T19:39:17.673Z    68ecb71f-eede-4cbd-81a9-5c677f11e556    ERROR   Error: ENOENT: no such file or directory, scandir '/var/task/.next/server/pages/projects'
    at Object.readdirSync (fs.js:1047:3)
    at getServerSideProps (/var/task/.next/server/pages/sitemap.xml.js:38:56)
    at Object.renderToHTML (/var/task/node_modules/next/dist/server/render.js:504:26)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at async doRender (/var/task/node_modules/next/dist/server/next-server.js:1428:38)
    at async /var/task/node_modules/next/dist/server/next-server.js:1523:28
    at async /var/task/node_modules/next/dist/server/response-cache.js:63:36 {
  errno: -2,
  syscall: 'scandir',
  path: '/var/task/.next/server/pages/projects',
  page: '/sitemap.xml'
}
RequestId: 68ecb71f-eede-4cbd-81a9-5c677f11e556 Error: Runtime exited with error: exit status 1
Runtime.ExitError

在我的sitemap.xml.js上执行此操作的代码片段是：

const staticPagesProjects = fs
                .readdirSync({
                    development: 'src/pages/projects',
                    production: __dirname + '/projects',
                }[process.env.NODE_ENV])
                .filter((staticPagesProjects) => {
                    return regex.test(staticPagesProjects) && (staticPagesProjects != "index.html") && (staticPagesProjects != "404.html") && (staticPagesProjects != "500.html");
                })
                .map((staticPagePath) => {
                    return `${baseUrl}/projects/${staticPagePath.replace(".html", "")}`;
                });

有人能告诉我路径有什么问题吗？为什么它能在我的电脑上工作，但不能在Vercel上工作？谢谢！