* Add basePath in link component and add/remove it consistently

* Update to not use regex for delBasePath

* Expose addBasePath as router method

* Revert "Expose addBasePath as router method"

This reverts commit 40fed596195c6affabf837e42d472452768e13a3.

* Expose basePath as router field

* Apply suggestion

* Expose basePath as router field

* remove un-used vars

* Update externals

* Apply lint fix

* Update size-limit test

* Update prefetch

* Remove req.env

* Rename NEXT_APP_ to NEXT_PUBLIC_

* Remove key exposing env config

* Update tests

* Update NEXT_APP_ test to NEXT_PUBLIC_

* Add initial support for new env config file

* Fix serverless processEnv call when no env is provided

* Add missing await for test method

* Update env config to .env.json and add dotenv loading

* ncc dotenv package

* Update type

* Update with new discussed behavior removing .env.json

* Update hot-reloader createEntrypoints

* Make sure .env is loaded before next.config.js

* Add tests for all separate .env files

* Remove comments

* Add override tests

* Add test for overriding env vars based on local environment

* Add support for .env.test

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

* Use chalk for env loaded message

* Remove constant as it’s not needed

* Update test

* Update errsh, taskr, and CNA template ignores

* Make sure to only consider undefined missing

* Remove old .env ignore

* Update to not populate process.env with loaded env

* Add experimental flag and add loading of global env values
Co-authored-by: NTim Neutkens <timneutkens@me.com>
Co-authored-by: NJoe Haddad <joe.haddad@zeit.co>

* Make sure to copy AMP SSG files during export

* bump

* bump

* Fix warning for API routes with next export

* Update warning copy

* Add custom amp optimizer and skip validation mode

* fix: type

* fix worker lint errors

* bump mkdirp to 1.0.3, which support promise

* fix mkdirp in spr-cache.ts

* bump fs-extra to 9.0.0

* remove mkdirp

* Check next.config.js settings

* Add tests

* test package.json case too

* Update to use existing util to de-dupe path check

* Update error message for requested/resolved mismatch

* Use correct dataRoute value for prerender manifest

* Fix pageUrl having double slash on Windows

* Changing variable name internally

* Add tests for custom AMP validator
Co-authored-by: NJJ Kasper <jj@jjsweb.site>

* Rename some spr related stuff to ssg

* Update packages/next/lib/constants.ts
Co-authored-by: NJoe Haddad <timer150@gmail.com>

* Use optional chaining syntax

* Changes as per review

* Bug fix

* Add support for exporting from serverless build

* Add more tests

* Update syntax

* Dont add dynamic params in worker

* Update amphtml rel for serverless tests

* Update tests again

* Update dynamic params populating

* Fix params parsing

* Pass params separately

* Emit Static Export Intent

* Remove the old export detail on rebuild

* Add test cases

* fix export

* Add a resolve return

* Add Support for Event Flushing

* Update packages/next/export/index.ts
Co-Authored-By: NJJ Kasper <jj@jjsweb.site>

* Allow custom amp validation

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

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

* chore: fix prettier error

* fix: set amp.valiator undefined by default

* `next export` should skip iSSG fallback page

* Move config to correct place

* Check if the user has a now.json

* Check for now.json

* Add check for custom server

* Add handling for exportTrailingSlash for iSSG pages

* Update index.test.js

* Pass config.experimental.cpus to export during build

Currently, there is no way of specifying the number of worker threads of
`next export` when run as part of `next build`.

I suggest a sane default should be to just use the same amount of
workers that were used during the build process which currently seems to
be configured through `config.experimental.cpus`.

This setting is already respected in the two other places where
jest-workers are in use: The TerserPlugin and the staticCheckWorkers in
`next build`.

* Only enable worker threads if there is more than 1 worker

Multiple worker threads can cause problems when certain dependencies are
being used, see e.g. https://github.com/zeit/next.js/issues/7894

This patch allows disabling of worker threads by setting
`config.experimental.cpus = 1`.

The benefit of spawning 1 worker thread, if there is any at all, should
very limited anyways, so the workload can just as well be processed in
the main thread.

* Disable parallel build for firebase authentication example

* Add integration test to cover #7894

* Rename test suite and add worker_threads config

* Disable worker_threads by default

* Update index.test.js

* Use workerThreads config for TerserPlugin

* Update to use workerThreads config in
TerserPlugin for consistency

* Disable node 12 specific test

* Add tracking src dir usage to telemetry

* Move isSrcDir back to eventVersion

* Move spinner back

* Add test for isSrcDir telemetry

* Add test for dev mode

* Do Not Rely on Module State

* Update storage.ts

* 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

* Remove experimental.publicDirectory config

* Error when public is set as an output dir

* Remove experimental.publicDirectory checks

* Update publicFiles checking in next build

This pull request converts Next.js' export CLI command to use TypeScript. This is useful for upcoming changes.

* Use Better Telemetry Directory
So, as it turns out, storing in `node_modules` is a bad idea.

Both npm and Yarn will remove additional files when you run `npm install` or `yarn install`.

Instead, we'll store this inside of Next.js' `distDir`. This should also be cached by users, if it's not, it probably won't be any worse as compared to `node_modules`.

* Fix directory name

* Fix build setup

* Record when export session is started

* Move more into branch

* Add revalidate header and error when invalid
object from getStaticProps

* Make sprCache no-op in dev mode

* Update packages/next/next-server/server/next-server.ts

* Update tests for fixes

* Update getStaticProps error and add test

* Update manifest test

* Add validating revalidate value

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

* Change from error to warning high revalidate value

* 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

* Add progress for analyzing and auto-prerendering

* Add typing for tty-aware-progress and use stdout

* Add fancier spinners

* Update spinner and add handling for logs while spinning

* Remove un-needed types package

* Remove progress and combine analyzing/prerendering messages

* Add failing test

* Add jest-worker to export

* 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

* Fix conflict between defaultPathMap and default 404.html export，if have a page in pages/404.js

* Update packages/next/export/index.js
Co-Authored-By: NJJ Kasper <jj@jjsweb.site>

* add test export-override-404

* Throw error if next export detects an api route

* Moved the test to the export tests

* Added missing comma

* Move the API route comment

* Add comma after replace

* Show a warning instead