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Move upgrading guide to /docs (#10727)
* Move UPGRADING.md to docs

* Add upgrading guide to manifest.json

* Update title

* Move to docs/upgrading

* Update UPGRADING.md

* Update docs/manifest.json

* Update UPGRADING.md

Co-authored-by: Tim Neutkens <tim@timneutkens.nl>
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chibicode and timneutkens committed Feb 28, 2020
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# Migrating from v8 to v9

## Preamble

#### Production Deployment on ZEIT Now v2

If you previously configured `routes` in your `now.json` file for dynamic routes, these rules can be removed when leveraging Next.js 9's new [Dynamic Routing feature](https://github.com/zeit/next.js#dynamic-routing).

Next.js 9's dynamic routes are **automatically configured on [Now](https://zeit.co/now)** and do not require any `now.json` customization.

You can read more about [Dynamic Routing here](https://github.com/zeit/next.js#dynamic-routing).

#### Check your Custom <App> (`pages/_app.js`)

If you previously copied the [Custom `<App>`](https://nextjs.org/docs#custom-app) example, you may be able to remove your `getInitialProps`.

Removing `getInitialProps` from `pages/_app.js` (when possible) is important to leverage new Next.js features!

The following `getInitialProps` does nothing and may be removed:

```js
class MyApp extends App {
// Remove me, I do nothing!
static async getInitialProps({ Component, ctx }) {
let pageProps = {}
if (Component.getInitialProps) {
pageProps = await Component.getInitialProps(ctx)
}
return { pageProps }
}
render() {
// ... etc
}
}
```

## Breaking Changes

#### `@zeit/next-typescript` is no longer necessary

Next.js will now ignore usage `@zeit/next-typescript` and warn you to remove it. Please remove this plugin from your `next.config.js`.

Remove references to `@zeit/next-typescript/babel` from your custom `.babelrc` (if present).

Usage of [`fork-ts-checker-webpack-plugin`](https://github.com/Realytics/fork-ts-checker-webpack-plugin/issues) should also be removed from your `next.config.js`.

TypeScript Definitions are published with the `next` package, so you need to uninstall `@types/next` as they would conflict.

The following types are different:

> This list was created by the community to help you upgrade, if you find other differences please send a pull-request to this list to help other users.
From:

```tsx
import { NextContext } from 'next'
import { NextAppContext, DefaultAppIProps } from 'next/app'
import { NextDocumentContext, DefaultDocumentIProps } from 'next/document'
```

to

```tsx
import { NextPageContext } from 'next'
import { AppContext, AppInitialProps } from 'next/app'
import { DocumentContext, DocumentInitialProps } from 'next/document'
```

#### The `config` key is now a special export on a page

You may no longer export a custom variable named `config` from a page (i.e. `export { config }` / `export const config ...`).
This exported variable is now used to specify page-level Next.js configuration like Opt-in AMP and API Route features.

You must rename a non-Next.js-purposed `config` export to something different.

#### `next/dynamic` no longer renders "loading..." by default while loading

Dynamic components will not render anything by default while loading. You can still customize this behavior by setting the `loading` property:

```jsx
import dynamic from 'next/dynamic'
const DynamicComponentWithCustomLoading = dynamic(
() => import('../components/hello2'),
{
loading: () => <p>Loading</p>,
}
)
```

#### `withAmp` has been removed in favor of an exported configuration object

Next.js now has the concept of page-level configuration, so the `withAmp` higher-order component has been removed for consistency.

This change can be **automatically migrated by running the following commands in the root of your Next.js project:**

```bash
curl -L https://github.com/zeit/next-codemod/archive/master.tar.gz | tar -xz --strip=2 next-codemod-master/transforms/withamp-to-config.js npx jscodeshift -t ./withamp-to-config.js pages/**/*.js
```

To perform this migration by hand, or view what the codemod will produce, see below:

**Before**

```jsx
import { withAmp } from 'next/amp'
function Home() {
return <h1>My AMP Page</h1>
}
export default withAmp(Home)
// or
export default withAmp(Home, { hybrid: true })
```

**After**

```jsx
export default function Home() {
return <h1>My AMP Page</h1>
}
export const config = {
amp: true,
// or
amp: 'hybrid',
}
```

#### `next export` no longer exports pages as `index.php`

Previously, exporting `pages/about.js` would result in `out/about/index.php`. This behavior has been changed to result in `out/about.html`.

You can revert to the previous behavior by creating a `next.config.js` with the following content:

```js
// next.config.js
module.exports = {
exportTrailingSlash: true,
}
```

#### `./pages/api/` is treated differently

Pages in `./pages/api/` are now considered [API Routes](https://nextjs.org/blog/next-9#api-routes).
Pages in this directory will no longer contain a client-side bundle.

## Deprecated Features

#### `next/dynamic` has deprecated loading multiple modules at once

The ability to load multiple modules at once has been deprecated in `next/dynamic` to be closer to React's implementation (`React.lazy` and `Suspense`).

Updating code that relies on this behavior is relatively straightforward! We've provided an example of a before/after to help you migrate your application:

**Before**

```jsx
import dynamic from 'next/dynamic'
const HelloBundle = dynamic({
modules: () => {
const components = {
Hello1: () => import('../components/hello1').then(m => m.default),
Hello2: () => import('../components/hello2').then(m => m.default),
}
return components
},
render: (props, { Hello1, Hello2 }) => (
<div>
<h1>{props.title}</h1>
<Hello1 />
<Hello2 />
</div>
),
})
function DynamicBundle() {
return <HelloBundle title="Dynamic Bundle" />
}
export default DynamicBundle
```

**After**

```jsx
import dynamic from 'next/dynamic'
const Hello1 = dynamic(() => import('../components/hello1'))
const Hello2 = dynamic(() => import('../components/hello2'))
function HelloBundle({ title }) {
return (
<div>
<h1>{title}</h1>
<Hello1 />
<Hello2 />
</div>
)
}
function DynamicBundle() {
return <HelloBundle title="Dynamic Bundle" />
}
export default DynamicBundle
```
This document has been moved to [nextjs.org/docs/upgrading](https://nextjs.org/docs/upgrading). It's also available in this repository on [/docs/upgrading.md](/docs/upgrading.md).
@@ -147,6 +147,10 @@
}
]
},
{
"title": "Upgrade Guide",
"path": "/docs/upgrading.md"
},
{ "title": "FAQ", "path": "/docs/faq.md" }
]
},

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