## What's wrong
This problem is specific to errors that happen on the client _after_ the initial mounting of the component. (The router has special logic to handle exceptions thrown in `getInitialProps` during a client-side navigation, and I've confirmed this logic is correct.)
Specifically, if the page is mounted, and you raise an exception on the page, the exception will cause the error page to be mounted without ever invoking `getInitialProps` on the new App/Error page pairing.
This has been illustrated with multiple repros in #4574.
## Why is it broken
This regression was introduced two months ago in #4156, where the invocation of `getInitialProps` was removed from the app's top-level error handler. Specifically, [this line](https://github.com/zeit/next.js/pull/4156/files#diff-895656aeaccff5d7c0f56a113ede9662L147) was removed and [replaced by a comment](https://github.com/zeit/next.js/pull/4156/files#diff-895656aeaccff5d7c0f56a113ede9662R167) that says that "`App` will handle the calling of `getInitialProps`".
I believe the sentiment about "`App` will handle calling `getInitialProps`" is mistaken. In fact, it really doesn't make sense on its face, since it would require an instance lifecycle method of `App` (which is mounted immediately after the comment) to invoke the `static getInitialProps` method on the error page.
## How I fixed it
I've fixed this in a fork by restoring Lines 146 – 148 that were removed in #4156. I think this is the right fix, but Next.js's handling of `getInitialProps` could certainly be improved. (The code in [this conditional](86d01706a6/client/index.js (L173)) speaks to the unnecessary complexity around this.)
Updating to a more recent version of `@types/next` fixes an error I encountered while building a new app on top of the "with-typescript" example:
`Property `push` not found in SingletonRouter`
Additional context: https://github.com/DefinitelyTyped/DefinitelyTyped/issues/26665
To test, add a simple Router.push operation to the `pages/index.tsx`
```
import Router from 'next/router'
// ...
<span onClick={() => Router.push({ pathname: '/about' })}>TEST</span>
```
Apollo's getDataFromTree is supposed to be called during the server side rendering.
Being called in browser it fires an unnecessary fake render process and blocks components from rendering with loading=true.
Also there was a mistake in this code:
// `getDataFromTree` renders the component first, the client is passed off as a property.
// After that rendering is done using Next's normal rendering pipeline
this.apolloClient = props.apolloClient || initApollo(props.apolloState.data)
**Apollo** component is not rendered by getDataFromTree actually, it renders the **App** directly, thus props.apolloClient will always be undefined.
This example was discussed here: https://github.com/zeit/next.js/issues/387.
Fixes#4713
I ran into this issue, when re-installing :
```
error upath@1.0.4: The engine "node" is incompatible with this module. Expected version ">=4 <=9".
error Found incompatible module
```
I used `yarn install --ignore-engines` as a workaround.
The purpose of the PR is to add the simplest possible integration with Storybook.
It leaves the default Storybook and also adds a custom component to show how it would be used in both the app and Storybook.
Update:
Tested with latest 👉 6.1.1
I had some trouble to get server side rendering with the AWSAppSyncClient working. I finally found a solution in https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/82 but it might be worth to share it here as well. Instead of adding a big code block to each file I'll just refer to this Pull Request.
______
In case you want to use the `AWSAppSyncClient` you just need to replace the `create()` function with this function:
```jsx
import AWSAppSyncClient from 'aws-appsync';
import { AUTH_TYPE } from 'aws-appsync/lib/link/auth-link';
function create(initialState) {
const client = new AWSAppSyncClient({
url: AWS_AppSync.graphqlEndpoint,
region: AWS_AppSync.region,
auth: {
type: AUTH_TYPE.API_KEY,
apiKey: AWS_AppSync.apiKey,
// Amazon Cognito Federated Identities using AWS Amplify
//credentials: () => Auth.currentCredentials(),
// Amazon Cognito user pools using AWS Amplify
// type: AUTH_TYPE.AMAZON_COGNITO_USER_POOLS,
// jwtToken: async () => (await Auth.currentSession()).getIdToken().getJwtToken(),
},
disableOffline: true,
}, {
cache: new InMemoryCache().restore(initialState || {}),
ssrMode: true
});
return client;
}
```
When clicking a next/link with a hash (#something) multiple times, it wouldn't keep the scrolling behavior browsers have. This makes sure we correctly trigger it.
Fixes#4686
Adds tests for @zeit/next-typescript so that we don't regress on this again.
I've fixed an issue in the `next` CLI too which caused lingering processes when the process gets force killed, which is what we do in the test suite, so it kept running if there was no manual quit.
This PR fixes#4615
From the issue :
> One thing we might consider is merging and showing a warning for keys not defined in exportPathMap
The behaviour after this PR is the following :
```js
// next.config.js
module.exports = {
exportPathMap: () => ({
'/': { page: '/', query: { a: 'blue' } }
})
}
```
| url called | `ctx.query` | warning ? |
|-|-|-|
| `/` | `{ a: 'blue' }` | |
| `/?a=red` | `{ a: 'blue' }` | |
| `/?b=green` | `{ a: 'blue', b: 'green' }` | `... parameter 'b' missing in exportPathMap` |
Is that the expected behaviour ? If not, I'll update the PR to shape the expected behavior.
I have spend whole day on profiling next.js compiling performance and one of the easy hacks to reduce built time is avoid doing full `stats.toJson()` that is heavy by default.
I can't use a functional component with `_document.js`.
[is-react](https://www.npmjs.com/package/is-react) can be used for another potential implementation of the warning logic, but maybe relying on `React.createElement()` internal checks is enough.
with-socket.io example was using a single index file and was managing connection in there. This would lead handling connection (disconnecting and reconnecting) in each added page.
I updated example with addition of `_app.js` and handled connection in there. This helped only subscribing to event in page and maintaining connection throughout example.
Next.js supports React 15 / React-like alternatives that don’t have the `rehydrate` method (preact) again since Next.js 5+. It’s still not recommended to use React 15. But there’s no need to mention that here as this is the initial installation and we instruct the user to install the latest version of React.
Fixes#4620
On the server and when navigating pages, the `asPath` is the pathname + query + hash visible to the users, not an url. This makes sure that we keep it consistent between hot reloads.
This makes sure plugins like @zeit/next-typescript or @zeit/next-mdx don't have to provide the `hot-self-accept-loader`.
This fixes for example @zeit/next-mdx, which doesn't implement `pageExtensions` but we do use mdx as top level pages for https://github.com/zeit/docs
I have updated [examples/with-markdown](https://github.com/zeit/next.js/tree/canary/examples/with-markdown) in order to make it works with next 6 🎉
<details>
<summary>Error</summary>
Error: Plugin/Preset files are not allowed to export objects, only functions. In /Users/zhenyatelegin/Desktop/next.js/examples/with-markdown/node_modules/markdown-in-js/babel.js
</details>
