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

* Don't rely on page-config plugin to detect iSSG usage

* Make sure to only update sprStatus if page file

* Remove dead-code elimination for iSSG code

* Revert next-page-config.ts

* Update index.js

* Update index.test.js

* Update to use a historyId to track invalid popstates

* Remove log from debugging

* Use Math.random instead of Date.getTime to avoid mocks

* Dedupe meta tag in favor of custom tag defined in _app

* Add test

* Fix comments

* Add buildId to SPR data routes

* Update buildId replace in serverless loader

* Use new RegExp and add comment

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

* Test to ensure client transition and handle / data route

* s/Automatic Prerendering/Automatic Static Optimization/

* Update more links

* initial commit for SPRv2

* Add initial SPR cache handling

* update SPR handling

* Implement SPR handling in render

* Update tests, handle caching with serverless next
start, add TODOs, and update manifest generating

* Handle no prerender-manifest from not being used

* Fix url.parse error

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

* Replace set with constants in next-page-config

* simplify sprStatus.used

* Add error if getStaticProps is used with getInitialProps

* Remove stale TODO

* Update revalidate values in SPR cache for non-seeded routes

* Apply suggestions from code review

* Remove concurrency type

* Rename variable for clarity

* Add copying prerender files during export

* Add comment for clarity

* Fix exporting

* Update comment

* Add additional note

* Rename variable

* Update to not re-export SPR pages from build

* Hard navigate when fetching data fails

* Remove default extension

* Add brackets

* Add checking output files to prerender tests

* Adjust export move logic

* Clarify behavior of export aggregation

* Update variable names for clarity

* Update tests

* Add comment

* s/an oxymoron/contradictory/

* rename

* Extract error case

* Add tests for exporting SPR pages and update
/_next/data endpoint to end with .json

* Relocate variable

* Adjust route building

* Rename to unstable

* Rename unstable_getStaticParams

* Fix linting

* Only add this when a data request

* Update prerender data tests

* s/isServerless/isLikeServerless/

* Don't rely on query for `next start` in serverless mode

* Rename var

* Update renderedDuringBuild check

* Add test for dynamic param with bracket

* Fix serverless next start handling

* remove todo

* Adjust comment

* Update calculateRevalidate

* Remove cache logic from render.tsx

* Remove extra imports

* Move SPR cache logic to next-server

* Remove old isDynamic prop

* Add calling App getInitialProps for SPR pages

* Update revalidate logic

* Add isStale to SprCacheValue

* Update headers for SPR

* add awaiting pendingRevalidation

* Dont return null for revalidation render

* Adjust logic

* Be sure to remove coalesced render

* Fix data for serverless

* Create a method coalescing utility

* Remove TODO

* Extract send payload helper

* Wrap in-line

* Move around some code

* Add tests for de-duping and revalidating

* Update prerender manifest test

* 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

* Prevent updating URL when delaying asPath

* Ignore TypeScript not liking __NEXT_DATA__

* Update another global to fix standard check

* Add autoExport to __NEXT_DATA__

* Update render variable

* Update pages-loader to return one value

* de-dupe page mod update also

* 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