fix process polyfill on middleware

[nkzawa]

Fixes the problem that global process variable has only the env field.
Also fixed the issue that the env field is empty when the process module is used as the value of the variable (which happens when the module is contained in a dependency of application).

Bug

• Related issues linked using fixes #number
• Integration tests added
• Errors have helpful link attached, see contributing.md

[ijjk]

Failing test suites

Commit: f34eaef

yarn testheadless test/integration/async-modules/test/index.test.js

• Async modules > production mode > can render async AMP pages
• Async modules > serverless mode > can render async AMP pages

Expand output

● Async modules › production mode › can render async AMP pages

TIMED OUT: just now

10 seconds ago

  474 |
  475 |   if (hardError) {
> 476 |     throw new Error('TIMED OUT: ' + regex + '\n\n' + content)
      |           ^
  477 |   }
  478 |   return false
  479 | }

  at Object.check (lib/next-test-utils.js:476:11)
  at Object.<anonymous> (integration/async-modules/test/index.test.js:85:7)

● Async modules › serverless mode › can render async AMP pages

TIMED OUT: just now

12 seconds ago

  474 |
  475 |   if (hardError) {
> 476 |     throw new Error('TIMED OUT: ' + regex + '\n\n' + content)
      |           ^
  477 |   }
  478 |   return false
  479 | }

  at Object.check (lib/next-test-utils.js:476:11)
  at Object.<anonymous> (integration/async-modules/test/index.test.js:85:7)

Read more about building and testing Next.js in contributing.md.

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
buildDuration	19.8s	18.5s	-1.3s
buildDurationCached	7.5s	6.9s	-565ms
nodeModulesSize	359 MB	359 MB	⚠️ +711 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
/ failed reqs	0	0	✓
/ total time (seconds)	4.103	3.769	-0.33
/ avg req/sec	609.24	663.29	+54.05
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	2.011	2.021	⚠️ +0.01
/error-in-render avg req/sec	1243.36	1236.87	⚠️ -6.49

Client Bundles (main, webpack, commons)

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	27.9 kB	27.9 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.5 kB	71.5 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
_app-HASH.js gzip	1.36 kB	1.36 kB	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	326 B	326 B	✓
dynamic-HASH.js gzip	2.57 kB	2.57 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	919 B	919 B	✓
image-HASH.js gzip	5.05 kB	5.05 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.26 kB	2.26 kB	✓
routerDirect..HASH.js gzip	321 B	321 B	✓
script-HASH.js gzip	383 B	383 B	✓
withRouter-HASH.js gzip	318 B	318 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	14.7 kB	14.7 kB	✓

Client Build Manifests

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
index.html gzip	532 B	532 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	526 B	526 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
buildDuration	22.1s	22.2s	⚠️ +105ms
buildDurationCached	6.9s	7.3s	⚠️ +351ms
nodeModulesSize	359 MB	359 MB	⚠️ +711 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.741	3.733	-0.01
/ avg req/sec	668.19	669.71	+1.52
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.932	1.901	-0.03
/error-in-render avg req/sec	1293.73	1314.93	+21.2

Client Bundles (main, webpack, commons)

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.1 kB	42.1 kB	✓
main-HASH.js gzip	27.9 kB	27.9 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.7 kB	71.7 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	180 B	180 B	✓
amp-HASH.js gzip	305 B	305 B	✓
css-HASH.js gzip	321 B	321 B	✓
dynamic-HASH.js gzip	2.56 kB	2.56 kB	✓
head-HASH.js gzip	342 B	342 B	✓
hooks-HASH.js gzip	911 B	911 B	✓
image-HASH.js gzip	5.08 kB	5.08 kB	✓
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	2.28 kB	2.28 kB	✓
routerDirect..HASH.js gzip	314 B	314 B	✓
script-HASH.js gzip	375 B	375 B	✓
withRouter-HASH.js gzip	309 B	309 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	14.7 kB	14.7 kB	✓

Client Build Manifests

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	nkzawa/next.js fix-middleware-process-polyfill	Change
index.html gzip	533 B	533 B	✓
link.html gzip	547 B	547 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.61 kB	1.61 kB	✓

Commit: fcba5b0