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

Co-authored-by: NJJ Kasper <jj@jjsweb.site>

This adds the initial changes outlined in the [i18n routing RFC](https://github.com/vercel/next.js/discussions/17078). This currently treats the locale prefix on routes similar to how the basePath is treated in that the config doesn't require any changes to your pages directory and is automatically stripped/added based on the detected locale that should be used. 

Currently redirecting occurs on the `/` route if a locale is detected regardless of if an optional catch-all route would match the `/` route or not we may want to investigate whether we want to disable this redirection automatically if an `/index.js` file isn't present at root of the pages directory. 

TODO: 

- [x] ensure locale detection/populating works in serverless mode correctly
- [x] add tests for locale handling in different modes, fallback/getStaticProps/getServerSideProps

To be continued in fall-up PRs

- [ ] add tests for revalidate, auto-export, basePath + i18n
- [ ] add mapping of domains with locales
- [ ] investigate detecting locale against non-index routes and populating the locale in a cookie

x-ref: https://github.com/vercel/next.js/issues/17110

* Expose dotenv loading under separate package

* Update pre-compiled

* Rename package to @next/env

* Update lint ignores

* Update package.json
Co-authored-by: NJoe Haddad <joe.haddad@zeit.co>

For some reason babel-plugin-syntax-jsx of babel 6 was used instead of
babel 7 version.

ref https://github.com/GoogleChrome/web-vitals/pull/68

won't fail the new [`no-unload-listeners`](https://github.com/GoogleChrome/lighthouse/pull/11085) Lighthouse audit.

Ref https://github.com/webpack-contrib/terser-webpack-plugin/blob/v4.1.0/package.json#L44

cacache is a dependency of terser-webpack-plugin. The latest version
depends on cacache 15 while next adds cacache 13. This may give
unexpected results. Better keep it in sync with terser plugin.

Babel-preset-env includes includes optional chaining and
nullish-coalescing since [7.8.0](https://github.com/babel/babel/releases/tag/v7.8.0).

In this diff I removed these plugins from next preset to prevent
dependency duplication when their newer versions are out.

The new version replaced big clone-deep package with dependency-free klona
- https://github.com/webpack-contrib/sass-loader/releases/tag/v10.0.0
- https://github.com/webpack-contrib/sass-loader/releases/tag/v9.0.0

Also deduped some related transitives.

There was a security update for node-fetch.

> This is an important security release. It is strongly recommended to update as soon as possible.
https://github.com/node-fetch/node-fetch/blob/master/docs/CHANGELOG.md#v261