靜態渲染
===

###### With Next.js App Router + next-intl
:::info
:radio_button: [回到目錄攻略](https://hackmd.io/@hJJ8etrATgudRfKA1gryew/BJiplPwMC)
:::

0.前言
---
當我在下`npm run build`與`npm run start`指令時卻出現了錯誤，錯誤警示寫著這是有關靜態/動態渲染。當時查了一些資料，在[next-intl初期建置的教學文件](https://next-intl-docs.vercel.app/docs/getting-started/app-router#static-rendering)中，看到了所需要注意的地方：
> By using APIs like useTranslations from next-intl in Server Components, your pages will currently opt into dynamic rendering. This is a limitation that we aim to remove in the future, but as a stopgap solution, next-intl provides a temporary API that can be used to enable static rendering.

> Next.js currently doesn't provide an API to read route params like locale at arbitrary places in Server Components (see vercel/next.js#58862). The locale is fundamental to all APIs provided by next-intl, therefore passing this as a prop throughout the tree doesn't stand out as particularly ergnomic.

>By using unstable_setRequestLocale, you can provide the locale that is received in layouts and pages via params to next-intl. All APIs from next-intl can now read from this value instead of the header, enabling static rendering.

這幾段主要在談論如何在 Next.js 中使用 Server Components 時，透過像是 next-intl 中的 `useTranslations` 這樣的 API，來進行動態渲染。

目前，這還存在著一個限制，即無法在任意地方讀取路由參數（如 `locale`）。為了解決這個問題，提供了 `unstable_setRequestLocale` 這樣的 API，可以讓 next-intl 中的所有 API 讀取這個參數，進而實現靜態渲染。

接著，就照下列的步驟一一實現吧！

1.將`generateStaticParams`加入至各layout
---
> @locale/layout.tsx
> @locale/main/layout.tsx
> ...

import { locales } from "@lib/config"; // (+)
// ...
export function generateStaticParams() {
  return locales.map((locale) => ({ locale }));
} // (+)
// ...
export default function XX (){
    // ...
    return (
    // ...
  );
}

2.將`unstable_setRequestLocale`加入至各layout和page
---
> @locale/layout.tsx
> @locale/main/layout.tsx
> ...

import { unstable_setRequestLocale } from "next-intl/server"; // (+)
// ...
export default function XX (){
    unstable_setRequestLocale(locale); // (+)
    // ...
    return (
        // ...
    );
}

> @locale/main/page.tsx
> @locale/north/page.tsx
> ...

import {unstable_setRequestLocale} from 'next-intl/server'; // (+)
// ...
export default function XX({params: {locale}}) {
  unstable_setRequestLocale(locale); // (+)
  // ...
  return (
    // ...
  );
}

這樣就能完美地渲染囉～