SWC import modularization plugin

[losfair]

Bug

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

Feature

• Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
• Related issues linked using fixes #number
• Integration tests added
• Documentation added
• Telemetry added. In case of a feature if it's used or not.
• Errors have helpful link attached, see contributing.md

Documentation / Examples

• Make sure the linting passes by running yarn lint

[losfair]

Side note: this pulls in handlebars as a dependency.

[vinnieking06]

Our team is currently migrating away from babel to swc, so we're excited to bring this transform-import functionality into our codebase. Any update on when this will be released?

[kdy1]

Nice work!
I have one performance concern

[kdy1]

LGTM.

[ijjk]

Failing test suites

Commit: f56478a

yarn testheadless test/production/next/jest/index.test.ts

• next/jest > should work

Expand output

● next/jest › should work

thrown: "Exceeded timeout of 90000 ms for a hook.
Use jest.setTimeout(newTimeout) to increase the timeout value, if this is a long-running test."

   6 |   let next: NextInstance
   7 |
>  8 |   beforeAll(async () => {
     |   ^
   9 |     next = await createNext({
  10 |       files: {
  11 |         'public/vercel.svg':

  at production/next/jest/index.test.ts:8:3
  at Object.<anonymous> (production/next/jest/index.test.ts:5:1)

● Test suite failed to run

TypeError: Cannot read property 'destroy' of undefined

  134 |     })
  135 |   })
> 136 |   afterAll(() => next.destroy())
      |                       ^
  137 |
  138 |   it('should work', async () => {
  139 |     const html = await renderViaHTTP(next.url, '/')

  at production/next/jest/index.test.ts:136:23

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	losfair/next.js feature/transform-imports	Change
buildDuration	15.4s	15.3s	-120ms
buildDurationCached	6.1s	6s	-116ms
nodeModulesSize	467 MB	467 MB	⚠️ +813 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	losfair/next.js feature/transform-imports	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.935	2.97	⚠️ +0.04
/ avg req/sec	851.9	841.75	⚠️ -10.15
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.236	1.208	-0.03
/error-in-render avg req/sec	2021.87	2069.01	+47.14

Client Bundles (main, webpack)

	vercel/next.js canary	losfair/next.js feature/transform-imports	Change
925.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	28 kB	28 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.6 kB	71.6 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	losfair/next.js feature/transform-imports	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	losfair/next.js feature/transform-imports	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	5.48 kB	5.48 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	15.2 kB	15.2 kB	✓

Client Build Manifests

	vercel/next.js canary	losfair/next.js feature/transform-imports	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	losfair/next.js feature/transform-imports	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 (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	losfair/next.js feature/transform-imports	Change
buildDuration	18.8s	19.1s	⚠️ +298ms
buildDurationCached	6.2s	6.1s	-91ms
nodeModulesSize	467 MB	467 MB	⚠️ +813 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	losfair/next.js feature/transform-imports	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.97	3.015	⚠️ +0.04
/ avg req/sec	841.78	829.15	⚠️ -12.63
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.197	1.193	0
/error-in-render avg req/sec	2088.99	2095.63	+6.64

Client Bundles (main, webpack)

	vercel/next.js canary	losfair/next.js feature/transform-imports	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	losfair/next.js feature/transform-imports	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	losfair/next.js feature/transform-imports	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	5.59 kB	5.59 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	15.3 kB	15.3 kB	✓

Client Build Manifests

	vercel/next.js canary	losfair/next.js feature/transform-imports	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	losfair/next.js feature/transform-imports	Change
index.html gzip	531 B	531 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: 7acf9a3