* Module/nomodule implementation based on RFC 7563

* Remove comment

* Fixing issue with building amp pages

* Fixing test cases for serverless mode

* Adding safari 10 nomodule fix. Preloading modern js by default

* Fixing size-limit integration test

* Bug fix

* Adding testcase for modern build

* Trigger rebuild

* Setting default crossOrigin value

* Moving modern config option inside experimental flag

* Adding nomodule attribute to safari-fix script

* Changing safari10NomoduleFix default value to true

* Removing safari-fix flag

* Changing .es6 to .module

* Disable modern default

* Removing default crossOrigin value. Setting modern flag to false by default. Fixed test cases

* Remove confusing defaults and mark required instead

* Adjust blacklist

* Move behavior of page marking

* Fixing childCompiler errors not being captured

* Tweak names

* Revert

* whoops

* Fixing bug with page-loader.js

* Changing modern babel cache name

* Rename helper

* Iterate over both bundles

* Correctly clamp bundle sizes

* Revert test

* Add modern mode tests

* Fix test

* test

* test2

* Reapply missing formatting

* Fix lint

* Compile for the current version of Node.js by default when producing server builds.

* Update packages/next/build/babel/preset.ts
Co-Authored-By: NJoe Haddad <timer150@gmail.com>

* Include server variation in Babel cacheKey

* Completely rewrite Create Next App

* Sort imports

* Show what package manager is being used

* Fix project name suggestion

* Update tests for new implementation

* Use normal prepublish command for on-install

* Upgrade Node version

* Switch to 8.16

* Disable v8 cache

* Swap out update check package and fix CLI boot

* Add Create Next App package

* Fix Create Next App tests

* Fix company name

* Update package.json

* Replace deprecated fs.exists with fs.access.

* Update packages/next/lib/file-exists.ts
Co-Authored-By: NJoe Haddad <timer150@gmail.com>

* Update packages/next/lib/file-exists.ts
Co-Authored-By: NJoe Haddad <timer150@gmail.com>

* Avoid sending user error to client Closes #7526

* Small improvments

* Update sending errors

Following this example confused me at first because it looked like it was using native fetch, and when that didn't work server-side I wasn't sure if that was my mistake or an issue with the docs.

* Adjust test names for `serve`

* Clarify names more

* Add babel option to use styled-jsx/babel-test in the preset

* Fix the types

* Correct info about export limitations

In `next export` `req` and `res` objects are present, but they are empty ( https://github.com/zeit/next.js/blob/master/packages/next/export/worker.js#L42-L43 ).

* Update README.md

* Add support for Precondition Failed status for static files

* Add test

* Trigger tests

* Update next-server.ts

* Add warning for experimental config usage

* Update config.ts

* Fixes #7991

* Fix tests

* Add default value for pageConfig for custom _error

* Add serverless mode for custom-error test