Fixes #9284

* Polyfilling fetch and object-assign

* Polyfilling corejs object-assign

* Adding object-assign in polyfills.js. IE11 does not support Object.assign

* Fixing failing test

* Updating object.assign polyfill to fix aliasing

* Updating test case value to match new build stats

* Increasing the size of default build to 225kb

* Fixing defer-script test case to not include polyfill.js

* Revert README.md

* Re-design the polyfill approach based on PR feedback

* Adding comment and fixing test case

* Rename polyfills chunk

* Extract aliases into helper

* Remove extra new line

* Fix TypeScript typings

* Adding _internal_fetch alias

* Adjust build manifest plugin

* Build manifest plugin changes - adding a separate entry for polyfills

* Rename polyfills entry in build-manifest.json

* Remove old comment

* Fix TS

* Set key

* Polyfills already added

* Filtring polyfill.module.js

* Fix test

* Add __internal_fetch to alias rule

* Adjust name

* bump size

* ignore polyfills

* sigh

* Add initial bit for plugins

* Add checks for needed metadata values

* Add test

* Initial plugins changes

* Add handling for _app middleware

* Add loading of _document middleware and
handling of multiple default export syntaxes

* Fix insert order for middleware member expression

* Remove early return from middleware plugin from testing

* Add tests for current plugin middlewares

* Update test plugin package.json

* Update handling for class default export

* Update to use webpack loader instead of babel
plugin, remove redundant middleware naming, and add field for required env for plugins

* Add middleware to support material-ui use case
and example material-ui plugin

* Update tests and remove tests stuff from google analytics plugin

* Remove old plugin suite

* Add init-server middleware

* Exit hard without stack trace when error in collecting plugins

* Add on-error-client and on-error-server and update
to run init-server with next-start in serverless mode

* Update init-client for google analytics plugin

* Add example Sentry plugin and update with-sentry-simple

* Remove middleware field/folder and use src dir for plugins

* Add post-hydration middleware and update
material-ui plugin

* Put plugins code behind flag

* Update chromedriver

* Revert "Update chromedriver"

This reverts commit 1461e978e677f7da05e29e0415ec614a04bf65f9.

* Update lock file

* Remove un-needed _app for sentry example

* Add auto loading of scoped packages, add plugins
config for manually listing plugins, and update
to only collect plugins once

* Update example plugins

* Expose plugins' config

* Rename plugin lifecycles and add babel-preset-build

* Rename other methods with unstable

* Update log when plugin config overrides auto-detecting

* s/Automatic Prerendering/Automatic Static Optimization/

* Update more links

* Global CSS Support

* Fix webpack configuration

* oneOf rule isn't necessary yet

* Adjust CSS chunk naming

* Begin testing CSS behavior

* Add another test TODO

* Replace null-loader with ignore-loader

* Turn on chunks for new CSS feature

* Fix multi test suite

* Test CSS import order

* Test style HMR

* Test CSS compilation

* Test compilation and prefixing together

* Verify CSS styling works for Development and Production

* Add missing TODO

* Remove unnecessary test

* Adjust TODO message

* Hide page until React hydrates

* Revert "Hide page until React hydrates"

This reverts commit 898d4e0ee547b003d5790e2b11476740d645b907.

* Hide FOUC during development

* Test CSS imports

* Update tests TODO

* Add fixture for url() test

* Test `file-loader` support in CSS files

* Use a simple variant of cssnano

* Self-import

* Undo bundling

* Implement suggestion

* Add autoExport to __NEXT_DATA__

* Update render variable

* better type for AppTree in NextPageContext

* updated tests

* new AppTreeType type and updated tests

* removed a commented out line

* another take on the type of AppTree, with updated tests

* allow passing additional props to AppType

* Update suite name

* Initial move

* Make emitting work

* Update paths

* Remove leftover files

* Add correct externals configuration

* Import correct path

* Update path to work with ts-server test

* Update lib directory

* Compile next-server/lib

* Add warning when empty object is returned
from getInitialProps

* Apply suggestions from code review
Co-Authored-By: NJoe Haddad <joe.haddad@zeit.co>

* Apply suggestions from code review
Co-Authored-By: NJan Potoms <potoms.jan@gmail.com>

* Remove Flying Shuttle experiment

* Remove more old tests

* Remove minify loader

* Also provide AppTree in NextPageContext

* Don't predefine AppTree as null in ctx

* Make update smaller

* Don’t reassign variable

* Add test for AppTree in NextPageContext

* Update utils.ts

* adds user timing marks for hydration step

* changes measure names and removes window namespaces by adding performance as a global to standard

* separates hydrate and render marks

* Add performance mark to router change instead of link click

* Changes performance mark name at router change

* adds checks for performance

* creates constants utils for performance and user timings

* Revert "Remove Old Prerender Implementation (#8218)"

This reverts commit 2ab300dd.

* Add contentHandler for page config

* Rename config from contentHandler to re-use
experimentalPrerender

* Remove un-needed changes

* Replace backslashes for manifest

* Update manifest output format

* Make prerender: true enable SPR behavior and update
to merge prerender-manifest for flying-shuttle

* Fix output path for / prerender file

* Add dynamic routes to test suite

* Add generating and previewing of skeletons
for prerendered dynamic routes

* remove inline prerender option

* update to not replace getInitialProps which allows
nested getInitialProps and add query when fetching prerender

* Apply suggestions from code review
Co-Authored-By: NJoe Haddad <timer150@gmail.com>

* Remove legacy prerender option

* Apply suggestions from review

* Apply more suggestions from review

* Apply suggestions from code review
Co-Authored-By: NJoe Haddad <timer150@gmail.com>

* Add handling of error when parsing json

* Update handling of moving exported pages

* Rename nextPreviewSkeleton to _nextPreviewSkeleton

* bump

* Provide AppContainer to getInitialProps for getDataFromTree

* Update to only pass AppTree component instead of AppContainer

* Clean up props and remove extra imports

* Make updates from review

* De-dupe AppTree a bit

* Re-use wrapApp in router

* Remove un-needed change

* revert changes to examples until on stable

* Add test for AppTree

Reverts zeit/next.js#8097

This PR caused bundle sizes to increase. We need to fix this bug before we continue adding invalid TypeScript exports to our code.

* Add warning for experimental config usage

* Update config.ts

* Added the RouteUrl type and improved router types

* Added more tests for router types

* Add build test for typescript types

* Add next-env.d.ts to the typescript test

* Removed next-env.d.ts

* Added next-env.d.ts to gitignore

* Remove route url re-exports

* renamed PublicRouterInstance to be NextRouter

* export the Url type

* Replaced BaseRouter with NextRouter in server/utils

* Don't export the Url type

* Update tsconfig.json

* Add default values for runtime config

* Add test to ensure default values are set
for runtime config

* Only add runtimeConfig if it's not empty

* Only add runtimeConfig if it's not empty

* Simplify default value adding

* Reduce bundle size

* remove comment changes

* Fix typos

* Add test for runtimeConfig in __NEXT_DATA__

* Allow React.Fragment for Document styles

Fixes https://github.com/zeit/next.js/issues/7784
Closes https://github.com/zeit/next.js/pull/7860

* Fix types

* Remove `Without`

* Fix NextApiResponse.status type signature

* Improve NextApiResponse typing

* Remove previous cache logic

* Remove old test

* Update to have default pageProps of {} instead of null

* Update test

* Test for empty object

* Clean up AMP logic

* Tweak AMP logic some more

* Rename hasAmpVersion to hybridAmp

* Cookies and Query parsing for API request

* Adding JSON and SEND

* First body parsing

* Body parsing

* Remove extra try catch

* Fix tests

* Only server bundling for API routes

* Update packages/next-server/server/api-utils.ts
Co-Authored-By: NTim Neutkens <tim@timneutkens.nl>

* Revert on demand server changes

* Use content-type for parsing

* Update packages/next-server/server/api-utils.ts
Co-Authored-By: NJan Potoms <potoms.jan@gmail.com>

* Add tests for server compilation

* Add body limit

* Change API to function chaining

* Limit test

* Run prettier over packages/**/*.js

* Run prettier over packages/**/*.ts

* Run prettier over examples

* Remove tslint

* Run prettier over examples

* Run prettier over all markdown files

* Run prettier over json files

* Add canonicalBase config to allow setting
absolute path for canonical link

* Make sure canonicalBase is set for
export and serverless

* Move canonicalBase to amp.canonicalBase

* Update tests with canonicalBase config

* Update tests

* run lint-fix

* Fix canonicalBase config parsing

* Fix canonicalBase during export

* Update amphtml tests

* Opt out of cache header if _app has custom
getInitialProps to match autoExport behavior

* Fix wrong component

* Add test for cache header

* App, Document, Page, Error types description

* Router description

* Added head changed router

* Additions

* Fix examples

* Push and replace details

* Update packages/next-server/lib/head.tsx
Co-Authored-By: NLuis Fernando Alvarez D. <luis@zeit.co>

* Update packages/next-server/lib/utils.ts
Co-Authored-By: NLuis Fernando Alvarez D. <luis@zeit.co>

* Update packages/next/types/index.d.ts
Co-Authored-By: NLuis Fernando Alvarez D. <luis@zeit.co>

* Update packages/next/pages/_document.tsx
Co-Authored-By: NLuis Fernando Alvarez D. <luis@zeit.co>

* Update packages/next/pages/_document.tsx
Co-Authored-By: NLuis Fernando Alvarez D. <luis@zeit.co>

* Update packages/next/pages/_app.tsx
Co-Authored-By: NLuis Fernando Alvarez D. <luis@zeit.co>

* Update packages/next/pages/_document.tsx
Co-Authored-By: NLuis Fernando Alvarez D. <luis@zeit.co>

* Remove loadGetInitialProps from _app and fix
cache-control header not being

* Update to still use loadGetInitialProps
in _app since it's simpler

* Add test for cache-control header with custom _app

* Added types for pages