* Asynchronously check for type errors

* Add TODO

* Fix webpack invalidation

* Show TypeScript error in dev client

* Updating hapijs package name

Hapi was moved to a new module under the name @hapijs/hapi.

Right now installing just as hapi is giving you this warning:

```bash
npm WARN deprecated hapi@18.1.0: This module has moved and is now available at @hapi/hapi. Please update your dependencies as this version is no longer maintained an may contain bugs and security issues.
```
This change does not affect the integration with next and it continues to work great.

* Update package.json

* Update page-loader prefetch checking

* Add test for re-prefetching same bundle

* Fix TypeScript typing
This correctly defines `process.browser` instead of `process.env.browser`.

It also removes `process.crossOrigin` because it's not found in our documentation anywhere and is mostly used for internal purposes.

* Make sure `process.browser` doesn't throw a type error

* Split globals from Next.js module

* Allow `test` as a valid NODE_ENV

* Fix type assignment

* Make sure global types get published

* Fix test

* Restoring not working mouse event

* Restoring possibility of conditionally switching off the prefetch

This PR compiles development-time dependencies that cause invalid syntax errors in IE 11 (ES 5).

Closes #7610
Closes #7612

* `_document` middleware is experimental

Closes https://github.com/zeit/next.js/issues/7580

* Turn on document middleware

This reverts commit e85a517e.

* Removed eslint packages and module-resolver from the example

* Removed unused package

* Reimplement ncc webpack build

This reverts commit 6feca310.

* Shared webpack build

* ncc workaround pending @zeit/ncc#437

* update ncc

* build tweaks, fixup autodll-import

* possible Node 8 fix

* second possible Node 8 fix

* and update taskfile

* Dynamic Routes: Change impl from $param to [param]

* Update expected test snapshot

* Update test to use new syntax

* Update test file

* Test more behavior

* Update route sorter for new param syntax

* Update dynamic routing tests

* Update danging test file

* Tweak test

* Fix dev and update tests

This should allow Terser to tree shake code branches.

* Correctly define NODE_ENV and `process.browser`

* Add crossOrigin property

Fix typo