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[Canary] use cache + next/dynamic fails in dev mode but works in prod — Next.js 15.4.2-canary.46
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上游 issue 正文
### Link to the code that reproduces this issue
https://github.com/NGR-NP/Nextjs-issue-dynamic-import-with-inline-use-cache
### To Reproduce
**Steps to Reproduce:**
Project structure:
```
src/
├── app
│ ├── components
│ │ └── headers
│ │ ├── mobile.tsx
│ │ └── web.tsx
│ ├── [device]
│ │ ├── layout.tsx
│ │ └── page.tsx
│ ├── favicon.ico
│ ├── globals.css
│ └── layout.tsx
├── constants
│ └── index.ts
├── lib
│ └── wait.ts
├── middleware.ts
└── types
└── TypeLocal.ts
```
**Root layout:**
```tsx
// app/layout.tsx
import type { Metadata } from "next";
import "./globals.css";
import { Suspense } from "react";
export const metadata: Metadata = { title: "Test", description: "Test" };
export default function RootLayout({ children }: { children: React.ReactNode }) {
return (
<html lang="en">
<body>
<Suspense>{children}</Suspense>
</body>
</html>
);
}
```
**Dynamic route layout with dynamic imports:**
```tsx
// app/[device]/layout.tsx
import dynamic from "next/dynamic";
import { Suspense } from "react";
import { constDevice } from "@/constants";
const MobileHeader = dynamic(() => import("../components/headers/mobile"));
const WebHeader = dynamic(() => import("../components/headers/web"));
// import MobileHeader from "../components/headers/mobile";
// import WebHeader from "../components/headers/web";
interface MainLayoutProps {
children: React.ReactNode;
params: Promise<{ device: string }>;
}
export default async function MainLayout({
children,
params,
}: MainLayoutProps) {
const { device } = await params as {device:TypeDevice}
return (
<>
<Suspense>
{device == constDevice.mobile ? <MobileHeader /> : <WebHeader />}
</Suspense>
{children}
</>
);
}
```
**Header with `"use cache"` function:**
```tsx
// app/components/headers/mobile.tsx
import { wait } from "@/lib/wait";
import { Suspense } from "react";
import { unstable_cacheLife as cacheLife } from "next…
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