Adding a example with **Neo4j** native graph database.

- with-neo4j: basic api routes with neo4j driver.

:)

Leverage [execa](https://github.com/sindresorhus/execa) for writing to `stdin`.

The `custom-server-koa` example is not working in the latest koa-router, so I made some changes mentioned in #9705.

Also update Koa.js to 2.13.0.

* [examples] add with-mysql example

* [examples] add demo link to with-mysql readme

* [examples] add next.js + mysql example with correct env pattern

* [examples] fix lint errors, update package name, remove unnecessary res statement

* [examples] remove unused imports and variables

* [examples] fix some linting errors

* Added NextApiHandler to API endpoints

* Lint fixes

* Added useEntry hook

* Updated type

* Update examples/with-mysql/package.json

* Updated readme

* fixed URL
Co-authored-by: NMatthew Sweeney <mail@mcs.dev>
Co-authored-by: NLuis Alvarez <luis@vercel.com>

Update for rebranding purposes

Fixes #19399

- Upgrade TypeScript example to Chakra UI v1
- Upgrade to React 17
- Patch some missing parts and fix broken icons in non TypeScript example
- Add example how to persist color mode when you refresh the page: https://chakra-ui.com/docs/features/color-mode#add-colormodescript

Source: https://chakra-ui.com/docs/migration

h/t to @prateekbh for noticing this test isn't cleaning up properly 

Closes: https://github.com/vercel/next.js/issues/19369

Mobx version 6 has been released, and it's a big one.

<blockquote class="twitter-tweet" data-partner="tweetdeck"><p lang="en" dir="ltr">Just released <a href="https://twitter.com/hashtag/mobx?src=hash&amp;ref_src=twsrc%5Etfw">#mobx</a> 6! <br><br>👉 makeAutoObservable 😍<br>👉 Decorator free by default<br>👉 Fully revamped docs for modern React <br>👉 Supersedes both MobX 4 and 5<br>👉 Codemod for migration<a href="https://t.co/U6EpZaNhyz">https://t.co/U6EpZaNhyz</a></p>&mdash; Michel Weststrate (@mweststrate) <a href="https://twitter.com/mweststrate/status/1311344102991159296?ref_src=twsrc%5Etfw">September 30, 2020</a></blockquote>


Decorator support is officially dropped, so the syntax for creating observable objects has changed (checkout store.js).

There is no need for custom babel configuration anymore.

In comparison to current mobx examples, the difference is that I'm using regular  `React.useContext` and `React.createContext` to consume the mobx store, [this is recommended by the official documentation.](https://mobx.js.org/react-integration.html#using-external-state-in-observer-components)

When the component is wrapped in the observer function, the component function is given a name so it appears correctly in the react development tools.

As of mobx v6  `mobx-react` package bundles `mobx-react-lite` so I could have used that package, but I've decided to use the `lite` one, because of the size.

This updates the fallback locale for `locale: false` to be the `defaultLocale` instead of the currently active `locale` as it allows passing through URLs more seamlessly as a URL without the locale prefixed can be treated as the `defaultLocale` instead of having to worry if the locale matches the currently active locale. This also ensures `locale={false}` is tested in the i18n-support-catchall suite

Closes: https://github.com/vercel/next.js/issues/19048

* Exclude well known files when trailing slash: true

* Update manifest test
Co-authored-by: NJJ Kasper <jj@jjsweb.site>

Adding a example with **Neo4j** native graph database.

- with-apollo-neo4j-graphql: basic apollo configuration with neo4j driver and neo4j-graphql-js.

:)

This adds additional test coverage and more handling for i18n + `trailingSlash: true`

Closes: https://github.com/vercel/next.js/issues/19069

- Bump the Tailwind version to v2.0
- Add necessary latest `postcss` and `autoprefixer` deps
- Clean the tw config a bit
- Add dark mode styles

This updates the export progress to make sure we log out the final progress update when less pages than number of progress updates (segments). This also adds tests to ensure we are logging the progress out as expected. 

Fixes: https://github.com/vercel/next.js/issues/19122
Closes: https://github.com/vercel/next.js/pull/19123

This ensures navigations to non-configured locales causes the 404 page to be shown, it also adds tests to ensure direct visits for non-configured locales 404s correctly. 

Fixes: https://github.com/vercel/next.js/issues/19214

Added the line _Prefetch can be disabled by passing `prefetch={false}`._

This makes sure we're using `next.js` in the err.sh links instead of `nextjs` since that leads to a 404

~~‼️ **Blocked** on https://github.com/vercel/next.js/issues/18096~~

Probably resolved here: https://github.com/vercel/next.js/issues/18096#issuecomment-729868888

Ref: https://github.com/emotion-js/emotion/pull/2062
Ref: https://github.com/emotion-js/emotion/issues/2041#issuecomment-720053255

Example upgrade here: https://github.com/upleveled/next-js-example-sep-2020/commit/f46407e345d3a00e99066d0276acb768f11ad02e

This adds a note about current `i18n` support and `next export` since it is not currently supported as was mentioned in the [initial RFC](https://github.com/vercel/next.js/discussions/17078)

x-ref: https://github.com/vercel/next.js/issues/18318

This fixes the case where we were returning page data when rendering `/_error` in `serverless` mode with `next start`

Closes: https://github.com/vercel/next.js/issues/19068

Some slight tweaks to match the corresponding blog post.

This PR removes the modern mode experiment because:

- It does not yield meaningful bundle size wins when compared to other initiatives we've taken
- It's not compatible with webpack 5 (which we're upgrading to)
- It's currently broken and causes most apps to malfunction
- There's no champion currently owning the experiment

We can re-introduce this in the future when we'd like to make it a default for all Next.js apps.

Note: **Next.js still supports Differential Loading (`nomodule`) and does it by default.** This PR strictly removes the experimental modern _syntax_, and does not disable our existing modern/legacy polyfilling.

---

Fixes #19200
Fixes #18960
Fixes #14707
Fixes #14465

Co-authored-by: Nkodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

This ensures redirects are handled properly with i18n + `trailingSlash: true`, additional tests have also been added to ensure this is covered 

Fixes: https://github.com/vercel/next.js/issues/19069

This makes sure SSG data is correctly prefetched for the default locale and other locales on the same page. Tests for this behavior have been added for catch-all and normal pages. 

Closes: https://github.com/vercel/next.js/issues/19048

This fixes compatibility with React 17 and `styled-jsx`.

Fixes #19242