Enable import assertion syntax parsing

[huozhi]

Feature

Enable import assertion syntax parsing for ecmascript/typescript. Since webpack has already supported it, enable import assertion parsing and leave them to webpack to handle

Upgration

• tooling: @swc/core, @swc/cli, prettier to support importAssertion related flags
• typescript related: typescript >= 4.5
• babel related: @babel/plugin-syntax-import-assertions
• lint parser: @typescript-eslint/parser

[kdy1]

swc options LGTM

[ijjk]

It seems this increased install size by ⚠️ +2.34 MB which might be related to the @babel/parser ncc change 🤔

[huozhi]

@ijjk The size increase are caused by inline source maps by swc, which is not enabled by default in previous version. fixed

[kdy1]

The options passed to swc looks good to me.

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall decrease ✓

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
buildDuration	15.2s	15.2s	-8ms
buildDurationCached	6.1s	6.2s	⚠️ +71ms
nodeModulesSize	375 MB	372 MB	-2.31 MB

Page Load Tests Overall increase ✓

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.924	2.923	0
/ avg req/sec	855.02	855.29	+0.27
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.193	1.189	0
/error-in-render avg req/sec	2095.4	2102.18	+6.78

Client Bundles (main, webpack)

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
925.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	huozhi/next.js enable-import-assertion	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
_app-HASH.js gzip	1.36 kB	1.36 kB	✓
_error-HASH.js gzip	192 B	192 B	✓
amp-HASH.js gzip	309 B	309 B	✓
css-HASH.js gzip	327 B	327 B	✓
dynamic-HASH.js gzip	2.57 kB	2.57 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	920 B	920 B	✓
image-HASH.js gzip	5.06 kB	5.06 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.26 kB	2.26 kB	✓
routerDirect..HASH.js gzip	320 B	320 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	319 B	319 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	14.8 kB	14.8 kB	✓

Client Build Manifests

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
index.html gzip	531 B	531 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	525 B	525 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Increase detected ⚠️)

General Overall decrease ✓

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
buildDuration	18.7s	18.7s	-30ms
buildDurationCached	6.1s	6.1s	-1ms
nodeModulesSize	375 MB	372 MB	-2.31 MB

Page Load Tests Overall increase ✓

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.903	2.911	⚠️ +0.01
/ avg req/sec	861.22	858.84	⚠️ -2.38
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.18	1.164	-0.02
/error-in-render avg req/sec	2119.44	2148.67	+29.23

Client Bundles (main, webpack)

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
925.HASH.js gzip	178 B	178 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	28.2 kB	28.2 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	72.1 kB	72.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	179 B	179 B	✓
amp-HASH.js gzip	313 B	313 B	✓
css-HASH.js gzip	324 B	324 B	✓
dynamic-HASH.js gzip	2.56 kB	2.56 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	921 B	921 B	✓
image-HASH.js gzip	5.2 kB	5.2 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	2.33 kB	2.33 kB	✓
routerDirect..HASH.js gzip	322 B	322 B	✓
script-HASH.js gzip	388 B	388 B	✓
withRouter-HASH.js gzip	317 B	317 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	14.9 kB	14.9 kB	✓

Client Build Manifests

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	huozhi/next.js enable-import-assertion	Change
index.html gzip	530 B	530 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	525 B	525 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: 0d10aa1