fix types of next-webdriver

[flybayer]

This does not touch any next.js code. This improves the integration test setup by properly typing next-webdriver.

[ijjk]

Stats from current PR

Default Server Mode (Increase detected ⚠️)

General

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
buildDuration	14.8s	15s	⚠️ +117ms
buildDurationCached	4.9s	4.6s	-272ms
nodeModulesSize	46.6 MB	46.6 MB	✓

Page Load Tests Overall increase ✓

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.525	2.529	0
/ avg req/sec	990.17	988.34	⚠️ -1.83
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.3	1.27	-0.03
/error-in-render avg req/sec	1922.46	1968.39	+45.93

Client Bundles (main, webpack, commons)

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
597-HASH.js gzip	13.3 kB	13.3 kB	✓
778-HASH.js gzip	7.12 kB	7.12 kB	✓
framework-HASH.js gzip	39.3 kB	39.3 kB	✓
main-HASH.js gzip	151 B	151 B	✓
webpack-HASH.js gzip	993 B	993 B	✓
Overall change	60.8 kB	60.8 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
_app-HASH.js gzip	1.3 kB	1.3 kB	✓
_error-HASH.js gzip	3.68 kB	3.68 kB	✓
amp-HASH.js gzip	558 B	558 B	✓
css-HASH.js gzip	363 B	363 B	✓
hooks-HASH.js gzip	924 B	924 B	✓
index-HASH.js gzip	243 B	243 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	336 B	336 B	✓
withRouter-HASH.js gzip	334 B	334 B	✓
99a142a5cfae..804.css gzip	125 B	125 B	✓
Overall change	9.52 kB	9.52 kB	✓

Client Build Manifests

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
_buildManifest.js gzip	390 B	390 B	✓
Overall change	390 B	390 B	✓

Rendered Page Sizes

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
index.html gzip	611 B	611 B	✓
link.html gzip	616 B	616 B	✓
withRouter.html gzip	605 B	605 B	✓
Overall change	1.83 kB	1.83 kB	✓

---

Serverless Mode

General

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
buildDuration	18.5s	18.4s	-82ms
buildDurationCached	7.1s	7s	-46ms
nodeModulesSize	46.6 MB	46.6 MB	✓

Client Bundles (main, webpack, commons)

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
597-HASH.js gzip	13.3 kB	13.3 kB	✓
778-HASH.js gzip	7.12 kB	7.12 kB	✓
framework-HASH.js gzip	39.3 kB	39.3 kB	✓
main-HASH.js gzip	151 B	151 B	✓
webpack-HASH.js gzip	993 B	993 B	✓
Overall change	60.8 kB	60.8 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
_app-HASH.js gzip	1.3 kB	1.3 kB	✓
_error-HASH.js gzip	3.68 kB	3.68 kB	✓
amp-HASH.js gzip	558 B	558 B	✓
css-HASH.js gzip	363 B	363 B	✓
hooks-HASH.js gzip	924 B	924 B	✓
index-HASH.js gzip	243 B	243 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	336 B	336 B	✓
withRouter-HASH.js gzip	334 B	334 B	✓
99a142a5cfae..804.css gzip	125 B	125 B	✓
Overall change	9.52 kB	9.52 kB	✓

Client Build Manifests

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
_buildManifest.js gzip	390 B	390 B	✓
Overall change	390 B	390 B	✓

Serverless bundles

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
_error.js	1.39 MB	1.39 MB	✓
404.html	2.76 kB	2.76 kB	✓
500.html	2.75 kB	2.75 kB	✓
amp.amp.html	10.7 kB	10.7 kB	✓
amp.html	1.96 kB	1.96 kB	✓
css.html	2.13 kB	2.13 kB	✓
hooks.html	2.01 kB	2.01 kB	✓
index.js	1.39 MB	1.39 MB	✓
link.js	1.45 MB	1.45 MB	✓
routerDirect.js	1.44 MB	1.44 MB	✓
withRouter.js	1.44 MB	1.44 MB	✓
Overall change	7.15 MB	7.15 MB	✓

---

Webpack 4 Mode (Decrease detected ✓)

General

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
buildDuration	12.4s	12.6s	⚠️ +178ms
buildDurationCached	5.3s	5.1s	-196ms
nodeModulesSize	46.6 MB	46.6 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.473	2.541	⚠️ +0.07
/ avg req/sec	1010.98	983.69	⚠️ -27.29
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.269	1.305	⚠️ +0.04
/error-in-render avg req/sec	1970.06	1915.45	⚠️ -54.61

Client Bundles (main, webpack, commons)

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
677f882d2ed8..HASH.js gzip	13.4 kB	13.4 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-HASH.js gzip	7.2 kB	7.2 kB	✓
webpack-HASH.js gzip	751 B	751 B	✓
Overall change	60.3 kB	60.3 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
_app-HASH.js gzip	1.28 kB	1.28 kB	✓
_error-HASH.js gzip	3.71 kB	3.71 kB	✓
amp-HASH.js gzip	536 B	536 B	✓
css-HASH.js gzip	339 B	339 B	✓
hooks-HASH.js gzip	887 B	887 B	✓
index-HASH.js gzip	227 B	227 B	✓
link-HASH.js gzip	1.65 kB	1.65 kB	✓
routerDirect..HASH.js gzip	303 B	303 B	✓
withRouter-HASH.js gzip	302 B	302 B	✓
21c68fa65a48..217.css gzip	125 B	125 B	✓
Overall change	9.36 kB	9.36 kB	✓

Client Build Manifests

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
_buildManifest.js gzip	419 B	419 B	✓
Overall change	419 B	419 B	✓

Rendered Page Sizes

	vercel/next.js canary	flybayer/next.js webdriver-types	Change
index.html gzip	613 B	613 B	✓
link.html gzip	619 B	619 B	✓
withRouter.html gzip	606 B	606 B	✓
Overall change	1.84 kB	1.84 kB	✓

Commit: ed3a8b4